Understanding Germination and Pathogenicity in ... - CORE

Understanding Germination and Pathogenicity in Zygomycota Species through Genomic and Transcriptomic

Approaches by Poppy Sephton Clark

A thesis submitted to the University of Birmingham for the degree of DOCTOR OF PHILOSOPHY

School of Biosciences College of Life and Environmental Sciences

University of Birmingham August 2019

University of Birmingham Research Archive

e-theses repository This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.

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Abstract

Mucorales spores are the causative agents of the emerging disease mucormycosis.

Mucorales species are also responsible for high quantities of food spoilage annually. The

mechanism by which Mucorales spores cause disease and rot relies upon spore

germination, however the mechanism underlying germination in these species remains

poorly understood. Presented here are results which characterise Mucorales spore

germination, through phenotypic and transcriptional studies (RNA-Seq), which followed

the defined germination phenotype throughout. Hallmark pathways are identified

through analysis of differentially expressed genes and co-transcriptional networks,

providing targets for germination inhibition. With the resulting transcriptional data, the

genome of Rhizopus delemar was enriched and analysed, thus providing better information

on the Mucoralean genome. Comparative genomics was also employed to better

understand genotypic variation between Mucorales species. To examine the differences

in pathogenicity between species, and assess the impact of germination stage on

pathogenicity, the transcriptional profile (RNA-Seq) of selected Mucorales species was

examined upon phagocytosis by innate immune cells. To better understand the

corresponding host response, the transcriptional response (single cell RNA-Seq) of innate

immune cells to Mucorales infection was also examined. Finally, germination targets

identified through the described analyses were targeted with suspected inhibitors to

confirm function in germination regulation. This work has furthered our basic understanding

of germination in these ancient fungi, indicated pathways essential to the germination

programme of Mucorales species, and demonstrated a crucial role played by many of these

pathways in host-fungal interactions of the Mucorales.

Sephton- Clark, Poppy

Acknowledgements

I would like to express my gratitude to Dr Elizabeth Ballou and Dr Kerstin Voelz, both advisors

have offered incredible support, encouragement and guidance. A special thanks to Dr Voelz

for taking me on and supporting me through the initial stages of my study, and to Dr Ballou

for encouraging me to continue along my research path and offering amazing support and

mentorship along the way.

I would like to express my appreciation to Dr Christina Cuomo, with whom I spent invaluable

time training with, and Professor Robin May, whose encouragement during my

undergraduate studies led me to continue my research in the fungal field. And of course, a

huge thanks to the amazing HAPI Lab members (past and present!). It has been a joy to

work in such a positive environment, with enthusiastic scientists so supportive of one

another!

I would like to say a special thank you to Daniel, for all of his support, curiosity

and encouragement. For celebrating triumphs with me, sharing frustrations with me and

always encouraging me to go after my goals. It is truly appreciated!

Last but not least, I would like to say thank you to my parents, for encouraging me for as

long as I can remember! For encouraging curiosity and always showing an interest in

whatever I was most fascinated with, thank you! Finally, I would like to say thank you to my

Gran, for all of her encouragement along the way!

Table of Contents

Chapter 1: Introduction .................................................................................. 5

Introduction: Mucorales .................................................................................................... 5

Food Spoilage ............................................................................................................................ 8

Mucormycosis ............................................................................................................................ 9

Mucorales spores and germination regulation ......................................................................... 10

Germination as a mechanism of pathogenicity ......................................................................... 12

Project Aims ................................................................................................. 15

Literature Review ............................................................................................................ 16

Introduction to fungal morphotypes: Spores and Hyphae ........................................................ 16 Importance of spores and hyphae in pathogenicity and food spoilage ..................................................... 20

Spore Composition .................................................................................................................. 22 The spore cell wall ...................................................................................................................................... 22 Spore compartmentalization and dormancy factors .................................................................................. 24 Water availability and metabolic activity ................................................................................................... 25

The Spore Germination Program .............................................................................................. 26 Spore polarization ...................................................................................................................................... 26 Hyphal outgrowth and extension ............................................................................................................... 28

Regulation of Germination ....................................................................................................... 29 The nutritional environment and germination .......................................................................................... 30 Germination Regulation via Ph, Temperature, Light and Environmental Gases ......................................... 35 Signalling molecules ................................................................................................................................... 40

Materials and Methods…………..………………………………………………………………………………………..43

Microbial Culture ............................................................................................................. 44

Fungal Culture ......................................................................................................................... 44 Spore Isolation ............................................................................................................................................ 44 Spore Growth ............................................................................................................................................. 44 Endosymbiont Curing ................................................................................................................................. 44

Bacterial Culture ...................................................................................................................... 45

Germination Phenotyping ................................................................................................ 46

Spore Germination Assay ......................................................................................................... 46 Live cell Imaging ......................................................................................................................................... 46 Flow Cytometry .......................................................................................................................................... 46 XTT Assay .................................................................................................................................................... 46 Exosome Release ........................................................................................................................................ 47

Genomic DNA Extraction, Sequencing and Analysis ......................................................... 48

Genomic DNA Extraction .......................................................................................................... 48 Fungal DNA Extraction ................................................................................................................................ 48 Bacterial DNA Extraction ............................................................................................................................ 48

Genomic DNA Sequencing ........................................................................................................ 48 Fungal Sequencing ...................................................................................................................................... 48

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Bacterial Sequencing .................................................................................................................................. 49

Genome Sequence Analysis ..................................................................................................... 49 Rhizopus microsporus Genome Assembly .................................................................................................. 49 Rhizopus microsporus Variant Identification .............................................................................................. 49 Comparative Genomics .............................................................................................................................. 50

Rhizopus delemar genome annotation update ......................................................................... 50

Transcription and Inhibition of Rhizopus delemar Germination ........................................ 51

Germination RNA-Seq .............................................................................................................. 51 RNA Isolation .............................................................................................................................................. 51 Data Analysis .............................................................................................................................................. 53

Germination Inhibition ............................................................................................................ 53 Inhibition Assessment of Targets Determined via RNA-Seq ....................................................................... 53 Strathclyde Natural Compound Library ...................................................................................................... 54

Rhizopus-macrophage interactions .................................................................................. 55

Macrophage ............................................................................................................................ 55 Macrophage Culture ................................................................................................................................... 55 In vitro Phagocytosis assay ......................................................................................................................... 55 Phagocytosis Live Cell Imaging ................................................................................................................... 55

RNA-Seq .................................................................................................................................. 56 Bulk Rhizopus RNA-Seq .............................................................................................................................. 56 Single Cell Macrophage RNA-Seq ............................................................................................................... 56 RNA-Seq Data Analysis ............................................................................................................................... 57

Other ............................................................................................................................... 58

Rhizopus delemar Protoplast Formation .................................................................................. 58

Zebrafish .................................................................................................................................. 58 Macrophage isolation and RNA Extraction ................................................................................................. 58

Chapter 2: Mucorales Spore Germination Characterisation .......................... 60

Germination phenotype diversity .................................................................................... 61

Results ............................................................................................................................. 65

Cell Size and Germination Rate ................................................................................................ 65

Morphology and Cell Wall Dynamics ........................................................................................ 67

Extracellular Vesicle Release .................................................................................................... 72

Discussion ................................................................................................................................ 74

Chapter 3: Hallmarks of the Mucorales genome ........................................... 77

Mucoralean Genomics ..................................................................................................... 78 Genome Statistics ....................................................................................................................................... 81

Results ............................................................................................................................. 81

Resulting Characteristics of the Reannotated R. delemar Genome ........................................... 81

Biochemical Pathways Present in R. delemar ........................................................................... 82 R. delemar WGD Enrichment ................................................................................................... 85 R. microsporus Genome Assembly and Statistics ...................................................................... 86

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Comparative Genomics ............................................................................................................ 88

Comparison with Aspergillus genomes ..................................................................................... 90 Discussion ........................................................................................................................ 90

Chapter 4: Transcriptional States of Germination ......................................... 92

Germination Regulation .................................................................................................. 94

Aspergillus species ................................................................................................................... 94 Conidial Transcripts .................................................................................................................................... 95Germination Metabolism ........................................................................................................................... 98

Neurospora crassa ................................................................................................................... 99

Fusarium species ...................................................................................................................... 100

Mucorales ...............................................................................................................................101 Results ........................................................................................................................... 103

Transcriptional Trends over Germination ................................................................................ 103

Differential Expression Throughout Germination .................................................................... 107

Metabolic Activity over Germination ...................................................................................... 114

Pathways Upregulated at Alternate Germination Phases ........................................................ 118

Co-transcriptional Networks ................................................................................................... 125 Duplicated Gene Pair Expression .............................................................................................................. 127

Potential Roles of Plant and Fungal Hormones as Germination Regulators ............................. 129

Potential Regulators With Known Functions In The Fungal Kingdom ....................................... 132

Comparisons of Transcription Throughout Germination .......................................................... 137 Discussion ...................................................................................................................... 140

Chapter 5: Transcriptional Regulation of Rhizopus-Macrophage Interactions .................................................................................................................. 143

Host-Pathogen Interactions in Mucormycosis ................................................................ 145

Results ........................................................................................................................... 148

The Fungal Response .............................................................................................................. 149

The Macrophage Response ..................................................................................................... 161

Modulating the Infection Outcome ......................................................................................... 166 Discussion ...................................................................................................................... 169

Chapter 6: Germination Inhibition .............................................................. 171

Manipulation and Inhibition of Germination .................................................................. 172

Results ........................................................................................................................... 175

Germination Inhibitors Identified Through Transcriptional Studies ......................................... 175

Germination Inhibitors Identified Through Natural Compound Screening ............................... 178 Discussion ...................................................................................................................... 180

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References ................................................................................................. 181

Appendix ................................................................................................... 211

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Chapter 1: Introduction

Introduction: Mucorales

The following work has been adapted from the book chapter “Spore Germination of

Pathogenic Filamentous Fungi” (Sephton-Clark and Voelz 2017), for which I performed the

literature search, wrote the manuscript, completed revisions, and prepared the figures.

Mucorales species (Figure 1), belonging to the Mucorales order of the Zygomycota division

(Mucoromycotina subdivision), are ancient diverging pathogenic fungi, capable of causing

mucormycosis. These species are also known as food spoiling agents, predominantly spoiling

soft fruits, vegetables and baked goods. Mucorales species are disseminated in their spore

form, which swell and produce aseptate hyphae upon germination (Hoffmann et al. 2013).

They reproduce sexually, via the combination of two hyphae (of opposite mating types)

producing zygospores, or asexually (Mendoza et al. 2014). Asexual reproduction is quicker

and leads to the formation of sporangiospores. These structures contain many spores which

are dispersed via water, air, or animal disruption (Moore-Landecker 2011). Sexual

reproduction introduces genetic variation into the population, allowing for the adaptation to

changing environments (Mendoza et al. 2014), whereas asexual reproduction and sporulation

provides an advantage in terms of dissemination, dispersal and colonisation of new

territories. Propagated spores are found ubiquitously throughout the environment and

remain dormant until favourable conditions prompt germination. Upon germination spores

swell and grow to produce aseptate hyphae (Hoffmann et al. 2013). Once hyphal growth is

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initiated, Mucorales species are characterised by rapid growth which allows them to cause

infection and food spoilage.

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Figure 1. Phylogeny of the Mucorales A) Figure adapted from “Phylogenetic and Phylogenomic

Definition of Rhizopus Species”, Gryganskyi et al, G3: GENES, GENOMES, GENETICS, 2018. This

figure shows the phylogeny of 5 Rhizopus species, including multiple R. delemar and R.

microsporus species, as well as Mucor circinelloides. This analysis has been performed based

on 192 orthologues genes, and compares this phylogeny to parsimony phylogeny. Genome

sizes have also been included in bold. B) Figure adapted from “An integrated genomic and

transcriptomic survey of mucormycosis-causing fungi”. Chibucos et al, Nature

Communications, 2016. This analysis shows the broader phylogenetic relationship of 38

Mucorales species, including multiple R. oryzae species, based on the relationship between

76 orthologous proteins. C) Phylogenetic tree based on NCBI taxonomy, generated with

phylot. The asterisk denotes species worked with throughout chapter 2-6.

C

Rhi

zopu

s de

lem

ar R

A 99

-880

Lichtheimia

Can

dida

alb

ican

s

Cunninghamella

Aspergillus nidulans

Rhizopus microsporus

Batrachochytriu

m dendrobatidis

Cryptococcus neoformans

Mucor circinelloides

*

*

*

*

A B

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Food Spoilage

Worldwide one in eight people are malnourished, whilst it is predicted that a third of

all food produced annually is wasted. Reducing this waste is crucial to improving food

security. Food spoilage is a significant contributor toward food waste; it has

been estimated that 20% of harvested fruit and vegetables are spoiled by microbes (Jay

1992; Barth et al. 2009), whilst in east Asian countries, rice losses due to bruising,

moulds and pest spoilage can be as high as 80% (Fox and Fimeche 2013) . It has also

been estimated that up to 5% of baked goods are spoiled by fungi every year, with

fungal spoilage estimated to cost $10,000,000 a year in Australia alone (Dao and

Dantigny 2011). Food spoilage due to fungal contamination occurs at pre-harvest,

storage, processing and packaging stages of food production (Bond et al. 2013) .

The ability to grow in acidic conditions, as well as at temperature extremes, has led

to the spoilage of fruit juices, pasteurized and refrigerated foods, predominantly by fungi

(Dao and Dantigny 2011).

Fungi of the Mucorales order are capable of invading plant tissue due to their rapid growth,

with fruits and vegetables providing an optimal pH, high water content and nutrient source

for growth (Turgeman et al. 2016). Sweet potatoes, cherries, peaches and tomatoes

in particular are commonly affected by Rhizopus spp. spoilage (J W Eckert and Sommer

1967). Rhizopus may even spoil unbroken fruits, as it is able to penetrate the skin by

secreting esterase enzymes (Baggio et al. 2016). Control of spoilage agents can be

achieved through storage of produce below 5°C, however it is not viable to store all fruit

and vegetables at this temperature (Joseph W Eckert and Ogawa 1989). Biological

agents such as Candida guilliermondii and Acremonium cephalosporium have been

used effectively to decrease Rhizopus spoilage of grapes (Zahavi et al. 2000), whilst

Pichia membranefaciens effectively

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inhibits spoilage within peach wounds through a proposed mechanism of competitive wound

colonisation (Qing and Shiping 2000; Bonaterra et al. 2003). Although storage at low

temperatures works well as a preventative measure, this is not feasible in all countries. With

few alternative options, it is necessary to develop new measures to reduce food spoilage and

increase food security.

Mucormycosis

Human mucormycosis, an emerging fungal infection caused by members of the Mucorales

order, has become a growing concern due to difficulty treating, resulting in mortality rates of

up to 90% (Trzaska et al. 2015; Brown et al. 2012; Kontoyiannis et al. 2012). Rhizopus, Mucor

and Lichthemia species are thought to account for 70-80% of all mucormycosis

infections (Gomes, Lewis, and Kontoyiannis 2011), whilst Cunninghamella has been

reported as one of the most aggressive and pathogenic species (Petraitis et al. 2013a).

Mucormycosis mainly affects immunocompromised patients, such as those having

undergone transplants, or in many cases individuals suffering from ketoacidic phases

due to diabetes (Lanternier and Lortholary 2009). Mucormycosis is especially prevalent

in countries with high counts of uncontrolled diabetes, as is the case in India

(Chakrabarti and Singh 2014). Mucormycosis diagnosis due to traumatic injuries is

common, whilst nosocomial acquisition in susceptible patients is also on the rise (Skiada et

al. 2012). Mucorales species manage to cause invasive infection due to their ability to

germinate, grow and proliferate within the host. They avoid killing by the host in

immunocompromised individuals, causing angioinvasion and tissue necrosis (Ibrahim et

al. 2012). Current treatment consists of lipid forms of Amphotericin B and surgical

debridement (Spellberg and Ibrahim 2010). Statins also effectively decrease the growth

of Rhizopus delemar, by attenuating germination and increasing the pathogens

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susceptibility to oxidative stress (Bellanger et al. 2016). Although alternative treatment

options are being explored, mortality rates remain high, available treatment options for

mucormycosis are severely limited and the outcome often leads to patients having affected

areas amputated.

Mucorales spores and germination regulation

Mucorales spores have been detected in a range of environments, from the sands of Saudi

Arabia to the forests of China (Murgia et al. 2019; Walther et al. 2013). They appear dark due

to the melanin within the cell wall, a feature common to many fungi which is thought to

protect against UV damage (Moore-Landecker 2011). These hardy spores can survive

temperatures of 60-70°C (maintaining viability), however once germination is initiated, these

spores become increasingly prone to damage (Turgeman et al. 2013). The composition of the

Mucorales cell wall changes over germination; under aerobic conditions chitin increases over

germination, with chitosomes acting as a reservoir for chitin synthase (Kamada, Bracker, and

Bartnicki-Garcia 1991). At rest, Mucorales spore cell walls contain large quantities of lipids,

accounting for 10-40% of the cell wall (Feofilova et al. 2015). The cell wall also contains

considerable chitin/chitinosan (11.6%), sugars (49.3%), protein (16.1%), phosphate (2.6%)

and melanin (10.3%) (Bartnicki-Garcia 1968).

Germination may be initiated upon cell wall breakage, removal of unfavourable conditions or

the introduction of specific cues and nutrients - such as water, carbon and nitrogen (Feofilova

et al. 2012; Mendoza et al. 2014). Essential nutrients for triggering germination of Rhizopus

oligosporus includes glucose, phosphates and a mixture of amino acids, with leucine

displaying a strong inductive effect on germination (Thanh, Rombouts, and Nout 2005). Blue

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and green light have also been proposed as germination regulators for the light-sensitive

protein possessing Mucorales species Mucor circinelloides (Herrera-Estrella and Horwitz

2007). Germination of Rhizopus delemar can be achieved with acidified glucose alone, as pH

regulates germination via the recruitment of aquaporins (RdAQP1 and RdAQP2) that enable

swelling (Turgeman et al. 2016). In Mucorales spores, the amount of RNA and protein within

the spore appears to increase exponentially as soon as germination is induced, however DNA

synthesis has not been reported to occur until 30 minutes before the production of germ

tubes (Cano and Ruiz-Herrera 1988).

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Spores of Cryptococcus neoformans and yeast cells of Candida albicans have been shown

to be key to dissemination throughout the host (Walsh et al. 2019; Seman et al. 2018).

C. neoformans spores are the infectious propagules which lead to greater dissemination

and mortality, when compared to infection with the yeast form (Walsh et al. 2019).

Similarly, Aspergillus species are disseminated throughout the host via their

conidial (spore) forms, however hyphae are often required for tissue damage and

invasion (Bertuzzi, Schrettl, Alcazar-Fuoli, Cairns, Munoz, et al. 2014; Seman et al. 2018;

Ben-ami et al. 2009; Ben-Ami et al. 2009). Spores are the infectious particles of Aspergillus

species and germination is central to pathogenicity (Zhao et al. 2006; Fortwendel et

al. 2005). Aspergillus has long been used as a model for understanding the lesser studied

Mucorales species, and though research in this field provides a framework, a full

understanding of Mucormycete pathogenicity requires comprehensive investigation into

mucorales species. The transition from Mucorales spore to hyphae appears to be a key

pathogenicity factor (Inglesfield et al. 2018; Mendoza et al. 2014), however the

underlying mechanisms which control this event in Mucorales species is poorly understood.

As filamentous growth leads to tissue damage, the rate of germination can also be

a contributing factor to virulence. In Rhizopus species, iron availability is known to

regulate virulence (Andrianaki et al. 2018) as iron limitation leads to inhibition of

germination (Kousser et al. 2019), and excess iron induces expression of the invasion

mediating CotH (Gebremariam et al. 2016). Cunninghamella spp. are also known as

one of the more aggressively invasive Mucorales species sets, the rate of germination

of Cunninghamella spp. is increased, when compared to that of other Mucorales species.

Mucor circinelloides shows increased virulence in its hyphal form, when compared to the

yeast form

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Germination as a mechanism of pathogenicity

(Herrera-Estrella and Horwitz 2007; Walsh et al. 2019; Seman et al. 2018; Ben-ami et al.

2009; Zhao et al. 2006; Fortwendel et al. 2005; Inglesfield et al. 2018; Andrianaki et al. 2018;

Lee et al. 2013).

In immunocompetent individuals phagocytes inhibit spore germination (Inglesfield et

al. 2018), a mechanism key to infection control in immunocompetent patients. Phagocytes

are rapidly recruited to the site of infection, and form innate granuloma-like

structures around spores, leading to a latent infection. Phagocytes of

immunocompromised patients fail to inhibit germination and subsequently life

threatening infections develop. Despite the vital role played by the innate

immune system in controlling mucormycosis, the interaction between Mucor

species and innate immune cells is poorly understood.

There are several challenges when working with species of the Mucorales order.

These include: a complete absence of chromosomal level genome assemblies (the

highest resolution Rhizopus assembly consists of 83 contigs) (Ma et al. 2009; Horn et

al. 2015; Mondo et al. 2017); the repetitive nature of Mucorales genomes which

makes for difficult assembly; unclear species phylogeny (Gryganskyi et al. 2018;

Hoffmann et al. 2013); minimal or absent genome annotation; limited genetic tools

for manipulation (until recently) (Garcia, Vellanki, and Lee 2018); and large

phenotypic variation and genotypic variation between species within the order.

Further to this, understanding of the pathogenicity mechanisms employed by

Mucorales species is limited (Gebremariam et al. 2014), compared to better

studied species such as Cryptococcus, Candida and Aspergillus spp. Aside from the

work presented here, there have been few comparative genomic and phenotypic studies

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of Mucorales species. To date, there have been no transcriptional (high-resolution)

studies of Mucorales germination, few studies which explore the transcriptional

basis of Mucorales-host interactions and only one which explores germination

inhibition as a means to inhibit pathogenicity (Trzaska et al. 2015).

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Project Aims

This project aims to further understanding of the mechanisms of germination in the

Mucorales species, and determine how this programme of morphological change and rapid

growth contributes to pathogenicity. Once a basic phenotypic and transcriptional

understanding of germination has been established, this project aims to detect mechanisms

key to pathogenicity and identify pathways targetable to inhibit germination and reduce

pathogenicity.

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Literature Review

The following literature review will give an overview of knowledge about fungal morphology

and germination regulation in multiple fungal species. Subsequent chapters will include

literature reviews on the current knowledge of: phenotypes of fungal germination (Chapter

2), hallmarks of the fungal genome (Chapter 3), transcriptional regulation of fungal

germination (Chapter 4), fungal-immune cell interactions (Chapter 5) and inhibition and

modulation of fungal germination (Chapter 6), relevant to the work presented in these

sections.

Introduction to fungal morphotypes: Spores and Hyphae

Spores may be formed either through sexual or asexual reproduction. Asexual reproduction

is thought to provide an advantage due to the speed at which the spores can be produced

and disseminated. Sexual reproduction, though often a longer process, presents an advantage

through introduction of genetic variation into the population (Moore-Landecker 2011;

Mendoza et al. 2014). The method of reproduction may be determined by the environment

encountered by the fungi. For example, It has been suggested that the decision to reproduce

sexually is regulated by trehalose homeostasis in Cryptococcus neoformans (Botts et al. 2014),

whilst Aspergillus species conidiate when grown in nutritionally sparse conditions (Adams,

Wieser, and Yu 1998). Although the nutritional triggers of sexual reproduction in the

Mucorales order have not been well studied, trisporic acid is capable of triggering this process

(Schimek and Wostemeyer 2012). Mucorales species produce this pheromone prior to sexual

reproduction: both mating types must co-operate to complete production, as they rely on

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one another for the interchange of intermediates required for this biosynthetic pathway (Lee

and Heitman 2014).

Asexual spores are genetically identical to their parent cells and may be formed through the

specific process of sporulation, or through the transformation of an existing cell. The asexual

spores of basidiomycetes, ascomycetes, mucormycetes and chytridiomycetes are known as

conidia, arthrospores or conidia, sporangiospores and zoospores (Table 1). Arthrospores are

produced through the conversion of an existing cell, whilst conidia, zoospores and

sporangiospores are formed through a specific process that produces new spores, known as

sporulation or conidiation. Blastospores form in a budding manner, budding away from

hyphae, swollen cells or vesicles. Specialized spore-producing cells known as phialides are

also capable of producing blastospores.

The sexual spores of basidiomycetes, ascomycetes and mucormycetes are known as

basidiospores, ascospores and zygospores, respectively. Sexual spores are usually formed via

the fusion of hyphae, zoospores or gametangia of opposite mating types. This process may

be initiated by the release of fungal hormones, as described for the mucormycetes (Austin,

Bu’lock, and Gooday 1969). The genomic structure of the mating locus has been described for

Rhizopus and Mucorales species and although sequence comparisons revealed locus

conservation, the results enable increased phylogeny resolution (Gryganskyi et al. 2010).

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Class Spore Type Reproduction Image Reference

Ascomycetes

Conidia on conidiophore: Aspergillus fumigatus

Asexual Aspergillus fumigatus, conidia, close-up SEM. Credit: David Gregory & Debbie Marshall. CC BY.

Basidiomycetes Conidia - Cryptococcus neoformans

Asexual

Isolation and Characterization of Cryptococcus neoformans Spores Reveal a Critical Role for Capsule Biosynthesis Genes in Spore Biogenesis: Botts et al. EukCell, 2009.

Mucormycetes Sporangiospore – Rhizopus delemar Asexual

Structure, Function, and Phylogeny of the Mating Locus in the Rhizopus oryzae Complex: Gryganskyi et al. PLOS ONE, 2010.

Chytridiomycetes Zoospore - Bd strain JEL423 Asexual

WASP and SCAR are evolutionarily conserved in actin-filled pseudopod-based motility: Fritz-Laylin et al. The Journal of Cell Biology, 2017.

Basidiomycetes Basidiospore - Cryptococcus neoformans

Sexual

Function of Cryptococcus neoformans KAR7 (SEC66) in Karyogamy during Unisexual and Opposite-Sex Mating: Soo Chan Lee, Joseph Heitman. EukCell, 2012

Ascomycetes Ascospore - Aspergillus fumigatus

Sexual

Credit: Bryan Hansen. Aspergillus fumigatus—What Makes the Species a Ubiquitous Human Fungal Pathogen?: Kwon-Chung KJ, Sugui JA. PLoS Pathog, 2013.

Mucormycetes Zygospore – Rhizopus oryzae Sexual

Structure, Function, and Phylogeny of the Mating Locus in the Rhizopus oryzae Complex: Gryganskyi et al. PLOS ONE, 2010.

Table 1. Table describing fungal spore types.

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Once spores are formed, they are usually kept suspended within sacs or fruiting bodies. These

structures may contain thousands of spores and differentiate from fungal filaments, to which

they remain associated. The number of spores contained in fruiting bodies can be described

as a balancing act: maximizing the number increases spread of the species, increasing chances

of survival, whilst too many may result in stalk collapse (Santorelli et al. 2008). Dispersion of

spores from sacs is achieved through wind, water or animal disturbance. Release of some

spores is also determined seasonally to coincide with the humidity and temperatures which

provide an optimal climate for the germination of different species.

Germination is induced through favourable conditions and generally occurs in the following

stages: isotropic growth or swelling, cell polarization, hyphal emergence and

hyphal elongation (Figure 2) (Bonazzi et al. 2014). The process of germination

culminates in the production of septate or aseptate hyphae depending on fungal species.

Throughout isotropic growth, the spores can visibly be seen to swell. During this phase

spores will take up water, whilst expanding and reorganizing their cell walls. Spores also

increase their metabolic activity and may use external or internal energy sources in

order to initiate transcription and translation (Griffin 1996; Novodvorska et al. 2016).

Polarization of the cell wall following swelling determines where the hyphal tube will

emerge and utilizes cell machinery such as the polarisome to support this process. This

stage involves an extensive remodelling of the cell wall to enable hyphal extension. When

hyphae emerge and extend, they grow to form what can be seen as a hyphal mat or

matrix, in which the hyphae may overlap and even grow towards nutritional or light sources

(Lucas, Kendrick, and Givan 1975; Dussutour et al. 2010).

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Figure 2. Schematic of germination. Adapted from Sephton-Clark & Voelz (2018).

Importance of spores and hyphae in pathogenicity and food spoilage

Although we are exposed to thousands of fungal spores every day (Moore-Landecker 2011),

not every spore we encounter is pathogenic. Of those which are pathogenic, the

developmental stage of the spore can affect the outcome of the encounter; whilst dormant

spores may not be pathogenic, the germinated counter parts are often capable of causing

disease in humans, animals or plants. To maintain dormancy, dispersed spores may employ

nutrient and enzymatic compartmentalization, alongside the release of germination

autoinhibitors, molecules which help regulate the maintenance of dormancy (Feofilova et al.

2012). Dormancy enables spores to avoid germination under conditions that may not be

optimal, or could even be harmful to the germlings. Under suboptimal conditions the

germling may perish due to environmental stress or lack of nutrients. Conversely, if spores

stay dormant too long, they may miss a golden opportunity to exploit their environment for

fungal growth and dissemination. As a result, the maintenance of dormancy is carefully

regulated.

Cues which initiate germination may include the host environment, signalling spores to

initiate pathogenic growth within or on a host. Once metabolically active, germinating spores

Light

Organic Nutrients

Inorganic Nutrients

Signalling Molecules

Isotropic Growth Hyphal Emergence Hyphal Growth

Temperature

pH

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have the potential to express their repertoire of virulence factors. Damage to the host may

be caused by the release of toxins, pathogenicity factors, or immunostimulatory

components such as cell wall constituents. Plant pathogenic Fusarium spp. are known to

produce and release phytotoxins which aid pathogenicity and invasion, through the

induction of host cell death (Nishiuchi et al. 2006). The human pathogen Aspergillus flavus,

is known to cause respiratory diseases, like many other Aspergillus sp. This may be through

pulmonary infection in an immunocompromised individual, or simply through an allergic

reaction induced by the inhalation of the conidia. A. flavus is also known to produce the

mycotoxin, aflatoxin, which can lead to liver damage and even cancers, if the toxin is

consumed (Hedayati et al. 2007). Similarly, Candida albicans produces candidalysin, a

cytotoxic peptide which is toxic towards tissue, and causes damage during

infection. Specifically, the hyphal form of C. albicans releases candidalysin, which aids

dissemination and host invasion (Moyes et al. 2016).

In many cases, filamentous growth initiated during spore germination may be the

underlying cause of disease. Filamentous growth can lead to tissue invasion and

disruption which may prove fatal to the host. The lesser known but often more

invasive Aspergillus terreus has been shown to produce accessory conidia, capable of

increased germination rates when compared to the primary conidia produced by

Aspergillus species, with accessory conidia forming hyphae within two hours of

germination initiation. This increased germination rate may account directly for the

aggressive pathogenicity of this species (Deak et al. 2009).

The emergence and extension of hyphae produced by plant pathogenic fungi, which is

frequently accompanied by the release of extracellular degradative enzymes, is often key to

infection. Infection caused by the wheat and barley pathogen Fusarium graminearum relies

21

on hyphal extension and the release of these enzymes in order to invade the host tissue

(Zheng et al. 2012). Hyphal growth is also key to the infection caused by Batrachochytrium

dendrobatidis and Batrachochytrium salamandrivorans. Once the motile chytrid zoospores

of the amphibian fungal pathogens Batrachochytrium dendrobatidis and Batrachochytrium

salamandrivorans have made contact with the mucus membranes of their hosts, they are

also known to utilise swelling and hyphal growth as a mechanism to invade host tissue (van

Rooij et al. 2012).

Spore Composition

The spore cell wall

The cell wall of spores offers increased protection against environmental factors allowing

survival of resting spores. The general structure and components within a spore cell wall are

relatively conserved between fungal species. While fungal cell walls mainly consist of

polysaccharides, with lipids and proteins usually accounting for a smaller percentage, the

ratio of these components largely depends on species.

The composition of the Mucor rouxii spore wall has been well documented and is known to

contain around 42.6% glucose, 16.1% protein, 10.3% melanin, 9.8% lipid, 9.5% chitosan,

2.1% chitin, 2.6% phosphate, 4.8% mannose and 1.9% glucuronic acid (Reyes and Bartnicki-

garcia 1964). Similarly, the S. cerevisiae strain AM3 ascospore wall consists of large

quantities of glucose (55%), mannan (17%), chitin/chitosan (9%), and protein (11%), along

with smaller quantities of phosphates and organic acids (Briza et al. 1988). The cell walls

of Aspergillus oryzae conidia show a much lower lipid content, at around 2%. However the

carbohydrate content is similar at about 30% in Aspergillus niger (Sumi 1928; Feofilova

et al. 1988), demonstrating the variability in ratio between species. The spore cell wall

22

of Aspergillus fumigatus has even been recorded to contain several lectins, capable of

binding sialic acid and fucose, along with other sugars (Houser et al. 2013). Interestingly, the

presence of some lectins has been shown to inhibit spore germination of penicillia

(Barkai-Golan, Mirelman, and Sharon 1978). The conidial cell wall of Aspergillus

fumigatus has also been shown to contain hydrophobic rodlets, known as RodA&B,

thought to give structural support to the spore wall, as well as enhancing the

adhesion of conidia to surfaces, and masking conidia from host immune recognition

(Paris et al. 2003; Aimanianda et al. 2009).

The cell walls of many spore forming pathogenic fungi are also known to contain melanin.

This pigment colours the spores brown, with an increased melanin content causing the

spores to appear darker and most melanin mutants displaying an ‘albino’ phenotype.

Fungal melanin consists of a highly complex structure, which exists in a stacked planar

sheet structure and is likely formed from DOPA oligomers or polymers (Nosanchuck et al.

2015). The inclusion of melanin into fungal cells varies markedly between

species. Melanin accompanies the hydrophobic rodlets in the outer layer of Aspergillus

fumigatus, where it is thought to confer pathogenicity (Akoumianaki et al. 2016), and

provide structural support (Pihet et al. 2009). The cell wall of an Aspergillus fumigatus

mutant, which does not possess melanin, showed decreased electronegativity,

hydrophobicity and a significant change in the structure of the conidial wall itself. This

includes a loss of the outer hydrophobic rodlet layer which likely accounts for the loss of

hydrophobicity (Bayry et al. 2014; Pihet et al. 2009). The accessory conidia of the

highly pathogenic Aspergillus terreus have a wall which is compositionally very

different to those of other Aspergillus species. The wall of A. terreus lacks the

rodlet coating on the outermost layer, as well as the melanised underlayer, and

also contains less ergosterol, demonstrating that variability even within a genus can

be vast (Deak et al. 2009).

23

In addition, the cell wall of spores from the dimorphic human pathogen Blastomyces

dermatitidis is known to contain melanin, which has been shown to offer protection

against UV (Ultra Violet) (Nosanchuk et al. 2004), whilst antioxidant carotenes may also

be present to provide protection against reactive oxygen species (ROS). In the

opportunistic human pathogen Cryptococcus neoformans, melanin-

containing vesicles known as fungal melanosomes are thought to deliver melanin to

the cell wall, and once trapped form the layers seen in C. neoformans (Eisenman et al.

2005, 2009). The presence of melanin in C. neoformans is associated with an increase

in virulence. It is thought that it provides protection against reactive oxygen

species (ROS) which phagocytic cells use against pathogens (Moore-Landecker 2011;

Schnitzler et al. 1999).

Spore compartmentalization and dormancy factors

The structure of spores is, in part, responsible for their ability to survive in extreme

environments. It should be noted that in general spore walls, structurally, are

very sturdy, although prone to morphing when under severely dehydrating

conditions (Sarmiento et al. 2006). By storing compounds which will be used in the initial

stages of germination separately from the enzymes which will catabolize them to release

energy for the initiation of germination, spores maintain dormancy and energy stores

(Dijksterhuis et al. 2007). For example, the storage molecule trehalose is highly

abundant in the cytoplasm of dormant Aspergillus nidulans conidia. However, it is not

metabolized in dormant conidia, indicating a lack of free trehalase enzymes. Trehalose is

rapidly mobilized and used as an energy source to fuel germination (Elbein 1974;

Svanström et al. 2014; Novodvorska et al. 2016).

In addition, dormancy factors can contribute to the maintenance of spores in a resting state.

In Rhizopus oligosporus the autoinhibitor, nonanoic acid, maintains dormancy through a pH

24

regulated germination inhibition mechanism (Breeuwer et al. 1997). A transcriptomic

approach which focused on dormant spores of A. niger, A. fumigatus and A. oryzae revealed

that the autoinhibitor bZIP-type transcription factor AftA plays a significant role in

maintaining dormancy. aftA mutants begin the process of germination much earlier

than wild type conidia, and before the correct nutrients are available. Regulators like

AftA are thought to be a common mechanism used by spores to maintain dormancy, with

AftA involved in the regulation of dormancy and germination through interaction with

conidia-associated genes such as the calA-family genes which encode a thaumatin-like

protein (Hagiwara et al. 2016).

Water availability and metabolic activity

The maintenance of little or no metabolic activity allows spores to preserve dormancy.

Metabolic activity of ‘dormant’ Aspergillus niger conidia measured in an

aqueous environment was seen to be severely reduced when compared to

germinated conidia. However, these readings may not present the true metabolic activity

of dormant spores, as the presence of water alone has been recorded to trigger

germination in A. niger (Teertstra et al. 2017; Novodvorska et al. 2016). Upon

germination, spores rapidly take in water (Turgeman et al. 2016), and maintaining a low

water content is thought to aid spore survival of desiccation. The water content of

Aspergillus oryzae conidia has been recorded to be as low as 17.8%, a third of the reported

percentage for S. cerevisiae yeast cells (Illmer, Erlebach, and Schinner 1999). It is thought

that the lower the water content, the better equipped the spores are to survive extreme

heat, although the thermostability of other spore components such as proteins and lipids

will also play a role in this context (Sumi 1928; Nicholson et al. 2000).

25

The Spore Germination Program

Spore polarization

Prior to hyphal emergence, polarization of the spores occurs. In many fungi this

process is reliant upon polarizomes, a protein complex which regulates polarity through

its effects on actin, chitosomes and microvesicles which support the synthesis of chitin

(Ruiz-Herrera and San-Blas 2003). This reliance appears conserved across fungi; work

done by Kamada et al. (1991) in Mucor rouxii spores demonstrates that

chitosomes act as a reservoir for chitin synthase throughout growth, as well as during

dormancy (Kamada, Bracker, and Bartnicki-Garcia 1991). The recruitment of polarizome

components and polarization-essential proteins has been well studied; during

germination the actin cytoskeleton of S. cerevisiae spores is regulated by polarizome

components Spa2p, Pea2p, Bud6p, Bni1p, Msb3 and Msb4. Over the course of

germination, these components, along with Ras2p, regulate the formation and

polarization of actin patches prior to polarized growth (Kono et al. 2005; Park and Bi

2007). The GTPase Cdc42p (cell division cycle 42) has been shown to be involved in

regulation and recruitment of the polarizome, as well as the GTP binding proteins known as

septins (Loeb et al. 1999; Bassilana, Blyth, and Arkowitz 2003; Momany and Talbot

2017). This conserved process of polarizome recruitment may also be

accompanied by coiled coil cytoskeletal proteins locating to the cell wall. These proteins

are thought to act as stress bearing structures to limit damage done by weakening the cell

wall through polarized growth (Fuchino et al. 2013). In P. discolor, this process is followed

by the formation of an ergosterol cap at the point of polarized growth (Van Leeuwen et

al. 2008). Small GTPases, such as Rho1p, are also involved in the regulation of

germination of S. cerevisiae (Kono et al. 2005). These hydrolytic enzymes have been

shown to be involved in cytoskeletal arrangement, exocytosis and cell wall composition

of the yeast. Cytoskeletal rearrangement also appears crucial to the

Spore polarization

26

polarization of Magnaporthe oryzae. The polarization of the plant pathogen Magnaporthe

oryzae has been shown to be regulated by the transcription factor Tpc1 (Transcription factor

for Polarity Control 1) which interacts with the pathogenicity factor Mst12, that regulates

infectious growth downstream of Pmk1 (mitogen-activated protein kinase 1) as well as

NADPH oxidase (G. Park et al. 2002). Tpc1 is dependent upon MAPK signalling for normal

regulation of cytoskeletal components, specifically F-actin components required for plant

invasion (Galhano et al. 2017). Kinase signalling is also implicated in polarization; the

pathogenic yeast Penicillium marneffei relies upon the p21-activated kinase pakA, which

localizes to the site of germination and plays a major role in the cAMP-PKA pathway, to

regulate polarization (Boyce and Andrianopoulos 2007). Kinases are also important for

polarization in S. cerevisiae; Cdk1 (Cyclin dependent kinase 1) and the cyclins Clb1-4

promote isotropic growth of the cells. The accumulation of Clb2 specifically within the

cytoplasm is thought to stabilize the switch between isotropic growth and

polarization (Machu et al. 2014). RAS signalling also appears important for germination

regulation; the G-protein alpha-subunits GasA and C are implicated in the regulation of

P. marneffei germination, both dependently and independently of RasA (Zuber, Hynes,

and Andrianopoulos 2003). GasA and C mutants also show defects in asexual

development, as well as conidial yield (Boyce and Andrianopoulos 2007; Boyce, Hynes,

and Andrianopoulos 2005; Pérez-Sánchez et al. 2010; Zuber, Hynes, and

Andrianopoulos 2003). Many pathways involved in polarization regulation appear

broadly conserved across filamentous fungal species, however it is likely there are also

many species specific germination processes (Huang and Hull 2017).

The polarization process in Mucor rouxii is impaired by the presence

of cAMP phosphodiesterase inhibitors, revealing that protein kinase A plays a

role 27

in the differentiation of M. rouxii spores. This is further evidenced by germ tube

emergence correlating directly with the amount of active PKA present, as threshold PKA

levels result in germ tube emergence (Pereyra, Mizyrycki, and Moreno 2000). PKA is also

important for the proper polarization of Neurospora crassa, and appears crucial to

germination of Aspergillus fumigatus conidia (Zhao et al. 2006; Bruno et al. 1996).

The mechanism of polarization and initial germination appears to be broadly conserved

across filamentous fungal pathogens (Boyce and Andrianopoulos 2015; D’Souza and

Heitman 2001; Fortwendel 2016), however with this conservation there appears to

be cross functionality: genes required for normal germination are frequently found to

have various other functions, often in asexual development and the production of conidia.

For example, the histidine kinase DRK1/drkA found in Blastomyces dermatidis,

Histoplasma capsulatum and P. marneffei is known to be required for sporulation,

virulence, cell wall integrity and production of infectious spores (Nemecek, Wuthrich, and

Klein 2006; Boyce et al. 2011).

Hyphal outgrowth and extension

Germ tube emergence follows swelling and is a result of polarized growth, with the hyphal

tip emerging from the site of polarization. Upon hyphal production, hyphae of most

Fusarium species will immediately penetrate agar under laboratory conditions, although a

few species produce hyphae that first grow along the top before penetration. As

pathogenesis is often initiated by conidial germination and germ tube production, the more

penetrating the species, the more pathogenic (Ruiz-Roldan et al. 2010; Petraitis et al.

2013b). For example, it is thought that the pathogenicity of Fusarium verticillioides

depends on the FPH1 (frustrated philade, conidiogenesis regulator) linked SIG1 (surface

vs. invasive germination), which regulates the invasive germination phenotype,

28

responsible for pathogenicity (Glenn, 2006).

To exit dormancy and establish growth, appropriate internal or external signals are required.

Germination can be initiated by the removal of dormancy factors, or by the introduction of

environmental cues. Similarly to the process of seed germination, the removal of dormancy

factors such as the dehydrin-like proteins DprA and DprB in Aspergillus fumigatus may induce

germination (Hoi et al. 2011), whilst the removal of the autoinhibitor methyl 3,4-

dimethoxycinnamate is essential for the germination of the plant pathogen Uromyces

phaseoli (Macko et al. 1970; Hogan 2006). Although this induction method may trigger

germination, it may not necessarily support full outgrowth of spores.

External cues capable of initiating germination and regulating growth include temperature,

light, nutrient availability, water availability, pH, quorum sensing molecules and osmolarity

(Alavi et al. 2013; Turgeman et al. 2016; Nguyen Van Long et al. 2017). Whilst species such

as Aspergillus niger can start germination when in contact with water alone, the initiation

of germination in Rhizopus delemar under starvation conditions induces atypical

morphology, fragmented DNA and increased susceptibility to cell death

(Turgeman et al. 2013; Novodvorska et al. 2016). Light responses have been well

studied in plants, although they do not all possess germinating spores. Dependent on the

wavelength, light is also capable of both inducing and inhibiting germination in fungi

(Franklin and Quail 2010; Röhrig, Kastner, and Fischer 2013; Possart, Fleck, and

Hiltbrunner 2014; Aron Maftei et al. 2014; Idnurm and Heitman 2005; Brunk et al. 2015).

29

Regulation of Germination

The nutritional environment and germination

An appropriate nutritional environment to support fungal growth is essential for initiation of

spore germination. The following sections will discuss the organic and inorganic nutrient

signals that can induce spore germination and sustain growth.

Organic nutrients

Organic cues are one of the most commonly used germination initiation factors for fungi.

Whilst carbon and nitrogen sources are generally indispensable for growth, macronutrients

known to trigger germination in various fungi are manifold and species-specific. Essential

nutrients for germination and activation of a higher metabolic rate in Rhizopus oligosporus

include glucose, phosphates and a mixture of amino acids, with leucine capable of triggering

germination (Thanh, Rombouts, and Nout 2005). Although Aspergillus niger may start to

germinate in water alone, D-tagatose, D-lyxose, and 2-deoxy-D-glucose will all trigger

germination, though they will not support outgrowth. For outgrowth D-glucose, D-mannose,

or D-xylose is required (Hayer, Stratford, and Archer 2013). However, not all carbon sources

are capable of triggering germination. For example D-galactose, L-glucose, and D-arabinose

have all been shown to be incapable of triggering germination in Aspergillus niger, whilst they

may support outgrowth if a complementary triggering sugar is present (Hayer, Stratford, and

Archer 2013). This supports the notion that different stages of germination may be carried

out regardless of whether conditions will support full germination (Hayer, Stratford, and

Archer 2013). Similarly, spores of Cryptococcus neoformans are able to germinate on minimal

water agarose medium, suggesting nutritional cues are not needed to trigger germination for

this species (Velagapudi et al. 2009). Blastomyces dermatitidis spores will germinate on a low

30

glucose substrate, but can also utilize complex carbon sources from decomposing matter, a

useful trait for exploiting carbon sources available in the environment. Additionally, B.

dermatitidis requires a nitrogen source such as allantoin, creatinine, quanidoacetic acid,

guanidine or cysteine. Interestingly, B. dermatitidis is also capable of growth at extremely

high ammonia concentrations, of up to 42-62mmol/l. This is particularly significant as the

growth of most soil inhabiting fungi will be inhibited at 2.1-4.2mmol/l. The ability to grow in

such extreme conditions provides B. dermatidis with an environmental niche which it may

exploit to increase its ubiquity (Baumgardner and Laundre 2001; Baumgardner 2009). The

composition of the carbon source can even lead to opposing effects on germination, whilst

L/D-leucine and/or unsaturated long chain fatty acids will induce germination in Microsporum

gypseum, saturated short chain fatty acids are inhibitory towards germination (Barash,

Conway, and Howard 1967).

Sulphur, a constituent key to life and a component of a few key amino acids, is required for

the growth of many fungal species (Marzluf 1993). It enables strengthening and proper

folding of protein structures through disulphide bridges, and is key to the functionality of

many essential enzymes such as permeases and proteases. A source of sulphur such as biotin,

thiamine or thioctic acid is required for the formation of Histoplasma capsulatum yeast cells.

Whilst it is not required for the formation of hyphae, both mycelial and yeast forms utilise

sulphur metabolism. It has been suggested that the sulphur requirement of the dimorphic

fungus Histoplasma capsulatum, specifically cysteine, is temperature dependent, indicating

the sulphur metabolism may be important for morphology and pathogenicity (Howard et al.

1980; Maresca and Kobayashi 1989).

31

Inorganic nutrients

Alongside macronutrients, micronutrients are also required by many fungi to initiate

germination and sustain growth. For example, studies investigating calcium metabolism in

Sporothrix schenckii showed that the presence of exogenous calcium stimulated mycelial

production, with hyphal emergence corresponding to calcium uptake (Rivera-Rodriguez and

Rodriguez-del Valle 1992).

Iron is essential for the proper growth of many fungi (Tamayo et al. 2014; Philpott 2006; C.

Zhang 2014). Although too little iron may result in growth defects, too much can also be

extremely toxic. Tight regulation of iron homeostasis is therefore essential. External

siderophores are often used to scavenge iron from the surrounding environment, whilst

internal siderophores store iron and limit toxicity. Aspergillus species employ the two

transcription factors SreA and HapX to regulate iron homeostasis via siderophores, such as

the intracellular siderophore SidC. Aspergillus nidulans conidia lacking SidC are known to be

more susceptible to oxidative stress and exhibit delayed germination when grown in

reduced iron environments (Eisendle et al. 2006). Interestingly, genes coding for

the biosynthesis of triacetylfusarinine C, a common fungal siderophore, are absent in

Aspergillus niger, indicating that there are many homeostatic mechanisms which

are implicated in maintaining the correct metal homeostasis (Franken et al.

2014). The siderophore rhizoferrin is used by Mucorales species to scavenge iron

from the surrounding environment. When Mucorales spores are germinated in iron

limited conditions, they can be seen to produce atypical hyphae (Lewis et al. 2011;

Kousser et al. 2019) and iron availability is known to regulate virulence in various

Mucorales species (Ibrahim 2011). Notably, Mucorales species such as Rhizopus

delemar may also bind iron provided by exogenous siderophores, such as the iron

overload treatment deferoxamine, increasing spore germination.

32

In turn, this leads to higher susceptibility to mucormycosis in individuals who have elevated

iron levels within their blood e.g. those with uncontrolled diabetes, patients receiving

blood transfusions or those suffering from hemochromatosis. The combination of

increased iron levels and treatment with the siderophore deferoxamine creates an

optimal growth environment for the spores of Mucorales species (Boelaert et al. 1993;

Gebremariam et al. 2016; Spellberg et al. 2016; Spellberg, Edwards, and Ibrahim 2016;

Ibrahim, Spellberg, and Edwards 2016).

Micronutrients are often required by spores to overcome environmental and host stresses.

Spores utilize enzymes such as catalase and superoxide dismutase (SOD) to avoid damage by

reactive oxygen species (ROS). These enzymes are dependent on the presence of transition

metals, namely Zn and Cu, to be able to perform their redox functions. Levels of SOD and

catalase were shown to increase in Aspergillus niger grown at extreme temperatures,

demonstrating their roles in survival in harsh conditions (Abrashev et al. 2005). SOD1, 2 and

3 are all required for the correct germination and outgrowth of Aspergillus fumigatus, whilst

deletions of individual SOD proteins alone leads to growth perturbations and increased

sensitivity to ROS (Lambou et al. 2010; Plante et al. 2017). Similar work done in Neurospora

crassa showed that catalase is important for the survival and viability of conidia. Catalase-1

mutants showed an increased susceptibility to hydrogen peroxide and a decreased ability to

germinate after exposure to light, when compared to the wild type control (Wang, Yoshida,

and Hasunuma 2007).

The acquisition of micronutrients from low availability environments allows many fungal

pathogens to survive and proliferate within hosts (Ballou and Wilson 2016). Nutritional

33

34

immunity is recognized as a way in which a host may limit the growth of a pathogen.

However, pathogens have developed high specificity scavenging systems to combat this.

Using high affinity chelators regulated by transcription factors such as ZafA (Aspergillus

fumigatus), Csr1 (Candida albicans) and other Zap1 orthologues to regulate zinc

homeostasis, pathogenic fungi may scavenge zinc from the host environment

(Böttcher et al. 2015; Moreno et al. 2007). ZafA is required for the correct germination of

Aspergillus fumigatus (Moreno et al. 2007), whilst Zap1 orthologues are thought

to contribute towards virulence of fungi. Similarly, copper homeostasis has been

shown to be important for the pathogenicity of fungi. Copper is also

essential to the germination of Schizosaccharomyces pombe. If lacking copper

transporters Ctr4 and 5, germination is halted at hyphal production, whilst the copper

transporter Ctr6 has also been suggested to play a role in germination. Ctr6 is localised

to the spore membrane at the end of the sporulation process, and spores lacking Ctr6

show decreased viability when grown in a low copper environments, than those with a

functioning Ctr6 (Plante et al. 2014).

Micronutrients are not only required for the initial growth of pathogenic fungi, but often

they are also implicated in ability of fungi to switch between dimorphic growth forms, as

is the case for Blastomyces dernmatidis. B. dermatidis is known to produce a

siderophore which aids in pathogenicity. Although it is capable of

growth without supplementary ferric iron, Blastomyces requires exogenous

magnesium and calcium for hyphal growth (Giles and Czuprynski 2004). The GATA

transcription factor SREB, found frequently amongst fungal species, has been shown

to regulate siderophore production in Blastomyces dermatidis, as well as lipid

droplet formation, triacylglycerol and ergosterol synthesis. As lipid droplets are

thought to be used as energy sources for Blastomyces dermatidis when transitioning

from yeast to mycelial growth, SREB is also essential for hyphal growth (Gauthier et al.

34

2010; Marty et al. 2015). Histoplasma capsulatum, another dimorphic pathogen, utilizes a

siderophore for pathogenicity and iron scavenging within host cells. Histoplasma

capsulatum has been shown to scavenge iron from host ferritin/fe-transferrin with the

SID1 encoded ferric reductase. Without the iron scavenger, Histoplasma capsulatum

is rendered incapable of replicating within host macrophages (Newman and

Smulian 2013). Histoplasma capsulatum also utilises the transition metal requiring

extracellular SOD and catalase enzymes to survive host ROS. As a result, decreasing the

levels of iron and zinc available to Histoplasma capsulatum leads to higher

susceptibility to macrophage killing (Garfoot and Rappleye 2016).

Germination Regulation via pH, Temperature, Light and Environmental Gases

Several exogenous factors, other than nutrient availability, are known to regulate

germination of fungi. The abiotic factors discussed below may be important signals that aid

pathogenic fungi to exploit their host environments at choice moments, or they may

be signals that it is not yet a suitable environment in which to germinate.

pH

pH has been well established as a factor which influences germination in many fungal

species and many pathogenic fungi grow best at the pH of their host

environment. The host environment may also be liable to pH change. Once

phagocytosed by host phagocytes, fungi are often subject to drastic pH changes within

the phagosome, as the phagocytes attempt to disarm the phagocytosed fungi through

fusion and fission events with both endosomes and lysosomes. Often, a matured

phagosome will degrade the captured microbe, therefore maturation arrest (or

phagosome escape) is a tactic often employed by fungi such as C. neoformans, to

avoid degradation (Smith, Dixon, and May 2014; Yates, Hermetter, and Russell 2005;

Gresnigt et al. 2018).35

The germination of the Mucorales species Rhizopus delemar is induced at lower pHs; this is

true in both artificial growth media, along with in vivo replicating conditions (Turgeman et al.

2016). The pH drop of the blood of diabetics undergoing a ketoacidic phase has even been

linked to an increased susceptibility to mucormycosis, as the decreased pH in turn leads to

an increased availability of iron and beta-hydroxybutyric acid for the fungus (Artis et al.

1982; Gebremariam et al. 2016). The pH dependent induction of germination in Rhizopus

delemar is known to be regulated by two aquaporins (RdAQP1 and RdAQP2). The optimal

pH for germination initiation was found to be between pH 4-5 (Turgeman et al. 2016).

Other fungi are capable of growing at a vast range of pH’s. The human fungal pathogen

Sporothrix schenckii is found ubiquitously in soils and can grow between pH 3.5-9.4 (Tapia

Noriega et al. 1993), whilst Candida albicans is capable of colonizing host environments of

extreme pH’s and growing in pH’s from 2-10 (Odds 1988). Many fungi rely on the zinc finger

transcription factor PacC, and the signalling pathway in which it is implicated, to sense the

pH of their surroundings. The PacC signalling pathway has also been shown to effect

germination in Aspergillus nidulans. Conidia lacking PacC components showed decreased

growth, when compared to the wildtype, whilst the acquisition of iron is also thought to be

dependent on PacC in A. nidulans (Bertuzzi, Schrettl, Alcazar-Fuoli, Cairns, Muñoz, et al. 2014).

A. nidulans further relies on the signal transduction components encoded by the PalA-I genes

to respond to environmental pH (Denison 2000). Given a suboptimal pH, fungi may modulate

the pH of their surrounding environment through the release of pH altering molecules.

Through the secretion of organic acids and ammonia, fungi are able to either increase or

decrease the pH of their surroundings (Cornet and Gaillardin 2014; Vylkova 2017).

36

Temperature

In some fungal species, temperature has been shown to effect germination more than other

factors. The germination of Cryptococcus neoformans was shown to be more reliant on

temperature than it is on nutrient availability (Forsythe, Vogan, and Xu 2016). The small

GTPase RAS1 has been shown to regulate the filamentous growth of Cryptococcus

neoformans through the mitogen-activated protein kinase (MAPK) and RAS specific signalling

pathways in response to shifting to higher temperatures (Alspaugh et al. 2000). Neurospora

crassa mcb strains which lack the cAMP dependent protein kinase are incapable of polarized

growth at higher temperatures, demonstrating that the complex triggers for germination are

interlinked (Bruno et al. 1996). Interestingly, Aspergillus nidulans RasA, which is also involved

in the polarization of conidia, regulates the germination of conidia in response to nutrients

through possible interactions with heat sensitive factors encoded by spore germination-

deficient (sgd) genes. These temperature dependent factors are also known to be important

for germination and polarized growth (Osherov and May 2000). Studies investigating the

impact of temperature on A. fumigatus germination revealed that over the course of

germination higher temperatures (37°C) upregulated carbohydrate, lipid and secondary

metabolism pathways, whereas lower temperatures (24°C) upregulated RNA metabolism and

processing (Sueiro-Olivares et al. 2015).

Whilst spore production is often induced in suboptimal conditions as a survival mechanism,

some fungi, such as the blight- causing fungus Exserohilum monoceras, require

specific temperatures in order to produce spores. The optimum temperature for

Exserohilum monoceras growth and spore production is between 27°C and 28°C (Zhang and

Watson 1997).

37

Light

Environmental factors such as light play a role in the regulation of spore germination and

growth in some species. Light induces germination and hyphae formation in arbuscular

mycorrhizal species such as Gigaspora gigantea, but will inhibit germination and growth of

many other fungal species, such as Puccinia graminis and Aspergillus fumigatus, dependent

on the wavelength (Nagahashi, Douds, and Buee 2000). The crop pathogen Puccinia

graminis showed inhibited germination when exposed to both white and far red

light, whilst germination occurred normally in dark conditions (Lucas, Kendrick, and

Givan 1975). Aspergillus fumigatus conidia showed decreased germination rates when

exposed to blue light, red light and far red light (Fuller et al. 2013; Röhrig, Kastner, and

Fischer 2013).

Light is sensed by fungi through photoreceptors which interact with and bind to fungal

chromophores, ultimately transmitting and eliciting a cellular response to light. Light

responses through photoreceptors have been studied extensively in the fungal plant

pathogen Neurospora crassa. It has been shown that both conidia production and release can

be regulated by the presence of blue light, through the con-6 and con-10 light responsive

genes (Linden, Rodriguez-Franco, and Macino 1997). A whole transcriptome response to light

exposure revealed that transcripts con-6 and con-10 were not only upregulated upon light

exposure, but also play a role in the germination of N. crassa conidia (Wu et al. 2014).

Similarly, con-6 and 10 homologues conF and J were found to induce conidia formation in

Aspergillus nidulans. A double mutant also harboured germination defects, demonstrating

the role of blue and red light to be involved in both conidia formation and germination,

which appears to be conserved across filamentous fungi (Suzuki et al. 2013). It has been

38

suggested that the light signalling pathways, such as the cellular response to blue light, in

Neurospora crassa may be dependent on internal ROS, as SOD1 mutations showed

increased light dependent accumulation of metabolites, suggesting ROS factors resulting

from light exposure may act as alternative signals to transmit the signalling responses

to light (Yoshida and Hasunuma 2004; Belozerskaya et al. 2012). In order to overcome the

oxidative stress which light induces, Neurospora crassa upregulates the production of

antioxidants and protective photopigments in response to light exposure (Wu et al. 2014).

Light exposure also increased the resistance of A. fumigatus conidia to UV and ROS,

demonstrating the ability to respond in a protective manner to potentially harmful stimuli

(Fuller et al. 2013; Röhrig, Kastner, and Fischer 2013). Alternate mechanisms such as

proton pumps are also activated by light; the light activated proton pump, CarO, is

involved in the formation of Fusarium fujikuroi hyphae, with hyphal growth rates

decreased under light conditions (Brunk et al. 2015; Garcia-Martinez et al. 2015).

The connection between light and germination has been exploited in both medicine and

agriculture (Lucas, Kendrick, and Givan 1975; Schmidt-Heydt et al. 2011; Baltazar et al. 2015;

Trzaska et al. 2017). Pulsed light containing UV spectra decreases the ability of spores to

germinate on food sources such as wheat grain, providing a useful food spoilage preventative

measure (Aron Maftei et al. 2014).

Gases

Atmospheric gases are most commonly used within food packaging to inhibit fungal

germination, to prevent food spoilage. Through [O2] reduction, or [CO2] increases (15-20%),

spoilage by species such as Rhizopus stolonifer is successfully controlled (Barkai-Golan 2001).

39

Although higher CO2 concentrations often result in germination inhibition, germination is

supported in Fusarium roseum at up to 32% CO2 (Wells and Uota 1970), and Rhizopus

oligosporus germination is supported by CO2 when O2 becomes limited (de Reu et al. 1995).

The signalling molecules known as quorum sensing molecules are capable

of regulating growth in both plant and human pathogenic fungi. One of the best-studied

examples is the quorum sensing molecule farnesol, a secondary metabolite produced

by Candida species when in stationary phase, capable of modulating the innate

immune response (Leonhardt et al. 2015) and inhibiting Candida albicans hyphal

growth at high concentrations (Piispanen et al. 2011). Farnesol is capable of regulating the

growth phase of Candida albicans populations, as well as biofilm formation (Ramage et al.

2002). Even at low cell densities, a condition which usually induces hyphal growth in

Candida albicans, it will not form hyphae if the quorum sensing molecule farnesol is

present (Kruppa et al. 2004). Furthermore, farnesol, produced in higher quantities

by Candida albicans grown between 37 and 40 °C, is known to inhibit the

production of hyphae by disrupting the degradation of the hyphal growth repressor

Nrg1. Nrg1 must be both down regulated via the cAMP-PKA pathway, as well as

degraded for Candida albicans to produce hyphae, a complex regulation which controls

the morphogenesis of Candida albicans and the resulting pathogenicity (Lu et al. 2014).

Farnesol has also been shown to inhibit the germination of the common plant

pathogen Fusarium graminearum, with higher concentrations of purified farnesol inducing

apoptosis (Semighini, Murray, and Harris 2008). Similarly, the presence of farnesol was

40

Signalling Molecules

shown to impair growth of Aspergillus nidulans and induce apoptosis like characteristics in

the hyphal form of Aspergillus niger (Semighini et al. 2006).

Whilst bacteria have been shown to modulate germination through nutrient competition

(Kousser et al. 2019), the presence of the bacterial and fungal cell wall component GlcNac is

also capable of inducing the switch to filamentous growth in Blastomyces dermatidis,

Histoplasma capsulatum and Candida albicans. This response in Histoplasma capsulatum

is thought to be mediated by the GlcNac transporters NGT1/2, required for the

filamentous response (Gilmore et al. 2013), whilst the DNA-binding containing RON1 is

involved in regulating this switch in C. albicans (Naseem et al. 2017).

Hormones produced by both plants and fungi are also capable of regulating the

germination of select fungal species. Gibberellic acids have been shown to stimulate the

germination of the plant pathogen N. crassa, whilst auxins show a dose dependent

modulation of germination. At low concentrations, auxins promote germination of the

plant pathogen Fusarium delphinoides, whilst at high concentrations it is inhibitory towards

germination (Kulkarni et al. 2013; Tomita, Murayama, and Nakamura 1984). The antagonist

to gibberellic acids, abscisic acid, has been shown to promote germination of the rice

blast fungus M. oryzae (Spence et al. 2015). Jasmonic acid was shown to decrease

germination of Fusarium oxysporum spores, whilst the germination of corn pathogen

Harpophora maydis can be subdued by the presence of sialic acid (Krol et al. 2015; Degani,

Drori, and Goldblat 2015). The gaseous hydrocarbon and plant hormone, ethylene, is

released by plants and known to initiate the ripening of fruits. Ethylene is also capable of

triggering germination of the plant pathogen Colletotrichum musae, so that germination

occurs simultaneously with fruit ripening. Upon germination, the fungus releases

extracellular cutinase; this enzyme hydrolyses the waxy cutin layer coating the

41

plant, enabling pathogen access to the cuticle of the plant. Other plant pathogens,

such as Fusarium solani pisi, even store the cutinase enzyme in the spores, enhancing

access to the plant upon spore contact and germination (Kolattukudy et al. 1995).

Plant hormones have also been shown to modulate the growth of some human fungal

pathogens. For example, sialic acid is capable of decreasing hyphal growth of Aspergillus

flavus. However, it is striking that plant hormones have mainly been seen to regulate the

germination of classical plant pathogens which rarely cause human infections. This suggests

fungal plant pathogens may have evolved or diverged to produce hormones which are almost

identical to those mentioned above, allowing fungi to regulate the growth of the plants which

they rely on for nutrients and leading to a dynamic co-regulation of growth between fungi

and their hosts.

42

Materials and Methods

This work has been adapted from the following articles: “Pathways of Pathogenicity:

Transcriptional Stages of Germination in the Fatal Fungal Pathogen Rhizopus

delemar”(Sephton-Clark et al. 2018) and “Host-pathogen transcriptomics of macrophages,

Mucorales and their endosymbionts: a polymicrobial pas de trois” (Sephton-clark et al.

2019). For both I conceived, designed and performed the experiments, collected the data,

performed the analysis and interpretation, wrote the manuscript, completed revisions, and

prepared the figures.

43

Microbial Culture Fungal Culture Spore Isolation

Spores were harvested from 10 day old cultures maintained on sabouraud

dextrose agar plates by washing with 10ml of phosphate buffered saline (PBS) (Sigma-Aldrich).

Spores in PBS solution were centrifuged for 3 minutes at 3000 rpm and washed with 5ml

of PBS. The pellet was resuspended in 3-5ml of PBS and the concentration of spores in the

suspension calculated by counting with a haemocytometer.

Spore Growth

Sabouraud Dextrose Broth

Spores harvested as above were grown in Sabouraud (SAB) broth (10 g/liter mycological

peptone, 20 g/liter dextrose), sourced from Sigma-Aldrich, at a range of temperatures (RT

to 37°C, protocol dependent), at 100-250 rpm.

Sabouraud Dextrose Agar Plate

100-200 spores, harvested as above, were spread evenly onto SAB agar plates.

Plates were incubated lid side up away from light at RT for 2-3 days, before being

turned (lid side down) and incubated in the same conditions for 7-8 days.

Endosymbiont Curing

To cure spores of their respective bacterial endosymbionts, spores were cultured with

ciprofloxacin, as described in Itabangi et al. 2019 (Itabangi et al. 2019). Briefly, spores were

passaged for a month in 60 μg/mL ciprofloxacin and cultured on ciprofloxacin plates

prior to use. Once cured, spores were sub-cultured at least twice in ciprofloxacin-free

media before use.

44

Bacterial Culture

Bacterial endosymbiont species, isolated by Herbert Itabangi, were grown in lysogeny broth

(also referred to as Luria-Bertani media) (LB), sourced from Sigma-Aldrich, at 37°C, for

12 hours, with 250rpm shaking prior to processing for genomic DNA extraction.

45

Germination Phenotyping

Spore Germination Assay

Live cell Imaging

Spores were harvested as above and used at 1x105 Spores/ml in 200μl of Sabouraud dextrose

Broth. Images of the spores were taken every 10 minutes over the course of 24 hours with

brightfield microscopy. Images were taken at 20X objective on a Zeiss Axio Observer. Images

were analysed with ImageJ V1.

Flow Cytometry

Spores were harvested as above and used at a concentration of 2x107 Spores/ml in 200μl of

SAB. Spores were incubated for between 0-6 hours, then fixed in 4% paraformaldehyde (PFA),

sourced from Sigma-Aldrich and prepared according to manufacturer’s instructions, before

staining with either calcofluor white (CFW) or Fluorescein isothiocyanate isomer I (FITC).

Spores stained with 250-1000 μg/ml of CFW were kept at RT, for 20 minutes, prior to washing

with PBS. Spores stained with 100 μg/ml FITC were kept at RT, for 30 minutes, prior to washing

with PBS.

XTT Assay

The XTT assay was used to measure metabolic activity of spores and germlings

(Antachopoulos et al. 2006; Moss et al. 2008). To germinating spores, XTT sodium salt and

menadione were added as described by Antachopoulos et al. After 80 minutes, optical density

readings at 450nm were taken, these reading correspond to metabolic activity. Readings were

46

also taken at 600nm to determine fungal biomass. Readings were corrected by the

appropriate controls during analysis.

Exosome Release

Spores were harvested as above and grown in SAB broth for 0-6 hours at 25°C. The

extracellular vesicles were isolated according to manufacturer’s instructions Exo-spin™.

Extracellular vesicle (EV) size was determined with dynamic light scattering (dls), a method

which determines the size of particles dispersed in a liquid, based on the detection of laser

beam scattering.

47

Genomic DNA Extraction, Sequencing and Analysis

Genomic DNA Extraction

Fungal DNA Extraction

Spores germinated in SAB broth at 37°C, 100-200 rpm shaking, for 12 hours were pelleted at

3000rpm, and washed in PBS. To washed spores 1ml of Qiagen DNEasy PowerLyzer Microbial

Kit lysis buffer (Solution SL) was added. The mixture was bead beaten at 6500 rpm for 2

rounds (30 seconds per round). Samples were immediately placed on ice post beating and

DNA was extracted from the resulting solution as per Qiagen DNEasy PowerLyzer Microbial

Kit instructions (column based extraction). Nanodrop measurements were taken to

determine DNA quality, and agarose gel electrophoresis (1%) indicated DNA integrity.

Bacterial DNA Extraction

Bacterial cells grown in LB broth at 37°C, 100-200 rpm shaking, for 12 hours were processed

according to the of Qiagen DNEasy PowerLyzer Microbial Kit (column based extraction).

Nanodrop measurements were taken to determine DNA quality, and agarose gel

electrophoresis indicated DNA integrity.

Genomic DNA Sequencing

Fungal Sequencing

Library preparation and sequencing of genomic DNA was performed by MicrobesNG. Briefly,

Nextera XT Library Prep Kit was used for library preparation and pooled libraries were

quantified using the Kapa Biosystems Library Quantification Kit for Illumina. Libraries were

48

sequenced on the Illumina HiSeq using a 250bp paired end protocol. 30X coverage was

obtained for all fungal species sequenced.

Bacterial Sequencing

Library preparation and sequencing of genomic DNA was performed by MicrobesNG. Briefly,

Nextera XT Library Prep Kit was used for library preparation and pooled libraries were

quantified using the Kapa Biosystems Library Quantification Kit for Illumina. Libraries were

sequenced on the Illumina HiSeq using a 250bp paired end protocol. 5X coverage was

obtained for all bacterial species sequenced. Species identification was carried out with

Kraken(Wood and Salzberg 2014).

Genome Sequence Analysis

Rhizopus microsporus Genome Assembly

Raw reads obtained from the MicrobesNG protocol above were quality checked with FastQC

(Andrews). Reads were assembled with SPAdes (Bankevich et al. 2012), using the R.

microsporus assembly (Mondo et al. 2017) as a reference (-untrusted contigs).

Rhizopus microsporus Variant Identification

Raw reads obtained from the MicrobesNG protocol above were aligned to the R. microsporus

assembly (Mondo et al. 2017) with bwa (Li and Durbin 2010). Samtools (Li et al. 2009)

and Picard (Broadinstitute) were used to extract alignment metrics. Haplotypecaller

(McKenna et al. 2010) was used to identify single nucleotide polymorphisms (SNPs) in the

aligned reads. SNPs identified in the aligned reads were used to replace their alternatives in

49

the reference genome with GATK (FastaAlternateReferenceMaker) (McKenna et al. 2010).

Subsequent reads generated via RNA-Seq were aligned to this hybrid.

Comparative Genomics

Fisher's exact test was used to detect enrichment of Pfam terms between Rhizopus

delemar and Rhizopus microsporus (R. delemar & R. microsporus), terms with a corrected

(FDR, false discovery rate) P value of < 0.01 were considered significant. Orthologue genes of

R. delemar and R. microsporus were identified using blast+. R (version 3.3.3) was used to carry

out hypergeometric testing of KEGG and GO terms to determine enrichment.

Orthologue genes of R. delemar and Aspergillus niger were identified using blast+.

The genome of R. delemar was reannotated by incorporating the RNA-Seq data via

BRAKER (version 2.1.0) (Hoff et al. 2016), this was fed into the Broad Institute

annotation pipeline, which removed sequences that overlapped with repetitive elements,

numbered, and named genes as previously described (Haas et al. 2011). Completeness of

annotation was analyzed with BUSCO (version 3) (Simão et al. 2015). Duplicated gene pairs

were identified based on parameters outlined by Ma et al (Ma et al. 2009) with

Python (version 3.5.5). GO term enrichment of duplicated gene pairs was determined

in R (version 3.3.3). Pathway Tools (version 21.0) was used to obtain information on

specific pathways (Karp et al. 2016).


Rhizopus delemar Genome Annotation Update

50

Transcription and Inhibition of Rhizopus delemar Germination

Germination RNA-Seq

RNA Isolation

Total RNA was extracted from R. delemar spores (harvested as above) which germinated in

SAB broth for 0,1,2,3,4,5,6,12,16 and 24 hours. To extract Total RNA, the washed samples

were immediately immersed in 1ml of Trizol and lysed via bead beating at 6500 rpm for 2

rounds, 30 seconds each. Samples were then either immediately frozen at -20°C and stored

for RNA extraction, or immediately placed on ice for RNA extraction.

All further work was done on ice to inhibit RNases. After lysis via bead beating, samples were

moved to clean Eppendorf tubes and 0.2ml of chloroform was added for every 1ml of Trizol

used in the sample preparation. Samples were incubated for 3 minutes, then spun at 12,000

G at 4°C for 15 minutes to separate out the aqueous and organic phases.

The aqueous phase, containing RNA, was placed into a fresh tube and the interphase and

organic phase containing proteins and DNA were stored at -20°C for any further work. To the

aqueous phase, an equal volume of 100% EtOH was added, before the samples were loaded

onto RNeasy RNA extraction columns. The columns were spun at 8000g for 30 seconds at 4°C

and the flow through discarded as RNA should now be bound to the silica column. 700µl of

buffer RW1 was added to remove and carbohydrates, lipids or proteins bound to the

column. It should be noted that at this point, only RNA longer than 200bp will remain

bound to the membrane, therefore if regulatory, small non-coding RNA etc... is also

being isolated, this method will not be suitable. The column was spun at 8000g for 30

seconds at 4°C and the

51

flow through discarded. The washing buffer RPE was then added to the column to remove

any contaminating salts which may affect results seen with the NanoDrop, or any other

equipment which relies on measuring absorbance to determine quantity and quality of RNA.

500µl of the buffer was added to the column, followed by a spin at 8000g for 30 seconds at

4°C, the flow through discarded. Another 500µl of the buffer was added to the column,

followed by a spin at 8000g for 2 minutes at 4°C, the flow through discarded. The RNA was

then eluted in two rounds, each using 30µl of RNase free dH2O to elute RNA by spinning the

columns at 8000g for 1 minute at 4°C. 3µl aliquots of each sample was then taken for testing

with the Nano drop, whilst the remainder of the sample was immediately frozen and stored

at -20°C.

Three biological repeats were performed and the quality of the resulting RNA was

checked by Agilent to ensure all RIN scores were above 8, indicating that there was

minimal RNA degradation within the sample and a good ribosomal RNA ratio (Schroeder et

al. 2006). 1ug of Total RNA was used for library preparation.

The following Library preparation was performed in accordance with the NEBNext pipeline.

mRNA was isolated with NEB’s Poly(A) magnetic isolation module. The isolated mRNA

was then fragmented to around 200bp with Mg2+ ions. From this, ds cDNA was

produced and underwent PCR amplification and indexing. The quality of the library was

checked by Agilent BioAnalyzer and the concentration was determined by qPCR prior to

sequencing.

52

Samples were sequenced using the Illumina HiSeq platform. 15 samples were loaded per lane,

with 140 million reads expected per lane. 100bp paired end sequencing was employed

(2X100bp).

FastQC (version 0.11.5)(Andrews) was employed to ensure the quality of all samples, a Phred

value of over 36 was found for every sample. Hisat2 (version 2.0.5) (Kim, Langmead, and

Salzberg 2015) was used to align reads to the indexed genome of R. delemar (JGI:

PRJNA13066) (Ma et al. 2009). HTSeq (version 0.8.0) was used to quantify the output

(Anders, Pyl, and Huber 2015). Trinity and edgeR (version 3.16.5) were then used to analyze

differential expression (Grabherr et al. 2009). Pathway Tools (version 21.0) was used to

obtain information on specific pathways (Karp et al. 2016). Cytoscape (version 3.5.1) was

used to analyse co-transcriptional networks.

Germination Inhibition

Inhibition Assessment of Targets Determined via RNA-Seq

Images of 1X105 spores/ml in SAB were taken every 10 minutes to determine germination

characteristics. Images were taken at 20X objective on a Zeiss Axio Observer. Calcofluor white

(CFW), fluorescein isothiocyanate (FITC) (Sigma-Aldrich), and the ROS stain carboxy-H2DCFDA

(6-carboxy-2=,7=-dichlorodihydrofluorescein diacetate [C400]; Invitrogen) were incubated

with live spores, according to the manufacturer’s instructions, prior to imaging. To assess

inhibition, spores were incubated with either: 1 to 5 mM hydrogen peroxide, 1.5 to 10 nM

antimycin A (Sigma-Aldrich) or Nikkomycin Z 120ug/ml prior to imaging. Bright-field and

fluorescent images were then analyzed using ImageJ V1.

Data Analysis

53

Strathclyde Natural Compound Library

Spores were harvested as above and used at a concentration of 1x105 Spores/ml in 200ul of

SAB. To measure metabolic activity the XTT assay was used (Antachopoulos et al. 2006; Moss

et al. 2008). The compound A10 was added to germinating spores at concentrations of 1000,

100, 75, 50, 25, 10, 1, and 0 ug/ml. To control for effects introduced by the extract solvent

(DMSO), DMSO was added to samples at an equal volume to the highest volume of A10

extract used. 3% Acetic Acid was used as a positive control. To measure metabolic activity and

inhibition the XTT assay was used (Antachopoulos et al. 2006; Moss et al. 2008). Optical

density readings at 450nm were taken at 80 minutes after the addition of the XTT mix.

Readings were also taken at 600nm to determine biomass.

54

Rhizopus-macrophage interactions

Macrophage

Macrophage Culture

Macrophages from the J774.A1 cell line were cultured in Dulbecco’s Modified Eagle Medium

(DMEM), (complemented with 10% foetal bovine serum, 1% penicillin, 1% streptomycin and

1% L-glutamine), sourced from Sigma-Aldrich. Macrophages were grown at 37°C, in 5% CO2.

In vitro Phagocytosis assay

Macrophages were incubated for one hour in serum-free DMEM prior to infection. Spores

were pre-swollen in SAB (2 hr for R. delemar, 4 hr for R. microsporus). Washed spores were

incubated at 5:1 MOI with 1 x 105 macrophages as described in Itabangi et al (Itabangi et al.

2019), to ensure that >95% of macrophages contained one spore or more. After a 1 hour of

incubation, excess spores were washed off the surface and the macrophages were incubated

for a further 2 hours, before processing for RNA-Seq experiments. For live cell imaging

experiments, images were taken starting immediately after the excess spores were removed.

Phagocytosis Live Cell Imaging

Time course images were taken to determine how LPS pre-treatment (100ng/ml) (Myers,

Tsang, and Swanson 2010) of macrophages, and Nikkomycin Z pre-treatment (120ug/ml over

the course of swelling in SAB) of spores effected phagocytic outcome. Images were taken at

20x on a Zeiss Axio Observer, with images taken every 5 minutes. Bright-field and fluorescent

images were then analysed using ImageJ V1.

55

RNA-Seq

Bulk Rhizopus RNA-Seq

RNA was extracted from spores which had either been incubated with the macrophages, or

incubated in DMEM for the equivalent time period. To remove the macrophages, triton at 1%

was used to lyse the macrophages, the resulting solution was then centrifuged for 3 min at

3,000 rpm, and washed, leaving only spores. The DMEM control also received the same

treatment. To extract total RNA, the washed samples were immediately immersed in TRIzol

and lysed via bead beating at 6,500rpm for 60s. Samples were then either immediately frozen

at −20°C and stored for RNA extraction or placed on ice for RNA extraction. After lysis, 0.2 ml

of chloroform was added for every 1 ml of TRIzol used in the sample preparation. Samples

were incubated for 3 min and then spun at 12,000 g at 4°C for 15 min. To the aqueous phase,

an equal volume of 100% ethanol (EtOH) was added, before the samples were loaded onto

RNeasy RNA extraction columns (Qiagen). The manufacturer’s instructions were followed

from this point onwards. RNA quality was checked by Agilent, with all RNA integrity number

(RIN) scores above 7 (Schroeder et al. 2006). One microgram of total RNA was used for cDNA

library preparation. Library preparation was done in accordance with the NEBNext pipeline,

with library quality checked by Agilent. Samples were sequenced using the IIlumina HiSeq

platform; 100-bp paired-end sequencing was employed (2 × 100 bp) (>10 million reads per

sample).

Single Cell Macrophage RNA-Seq

For single cell sequencing experiments, macrophages were infected with fungal spores, as

outlined above. Uninfected macrophages, used as a negative control, were treated in the

56

same manner and underwent mock washes and media changes at identical time points to

infected macrophages. Macrophages were isolated and released from the bottom of their

wells with accutase, as per manufacturer’s instructions (Technologies). Once in solution, the

macrophages were loaded onto the 10X genomics single cell RNA sequencing pipeline for

single cell isolation and library preparation. In total, 1082 single cells were sequenced. The

libraries were sequenced on the IIlumina Sequencing Platform.

RNA-Seq Data Analysis

For the bulk RNA-Seq data, FastQC (version 0.11.5)(Andrews) was employed to ensure the

quality of all samples. Hisat2 (version 2.0.5)(Kim, Langmead, and Salzberg 2015) was used to

align reads to the indexed genome of R. delemar RA 88-880 (PRJNA13066)(Ma et al. 2009)

and the indexed genome of R. microsporus (Mondo et al. 2017). HTSeq (version 0.8.0)(Anders,

Pyl, and Huber 2015) was used to quantify the output. Trinity and edgeR (version 3.16.5) were

then used to analyse differential expression (Grabherr et al. 2009). For the single cell RNA-

Seq data, the 10X genomics analysis pipeline (Loupe Cell Browser V 2.0.0, Cell Ranger Version

V 2.0.0) was used to align reads to the mus musculus genome (version MM10), and quantify

the output. For single cell analysis, the samples were then aggregated using this pipeline, to

allow comparisons between samples.

57

Other

Rhizopus delemar Protoplast Formation

R. delemar spores were harvested as above and incubated in 10ml of SAB broth at 37°C until

germ tubes roughly equal in length to the diameter of the spores had formed. The germlings

were then spun at 3000 RPM for 3 minutes and the supernatant removed. The germlings were

washed in PBS and resuspended on 10ml of 0.6M KCl, with the addition of 50mg of glucanex.

The germlings were incubated at 30°C, 100RPM and checked periodically for protoplast

formation using brightfield microscopy. The bodies that formed were imaged with brightfield

microscopy. To check for protoplast formation, the resulting bodies were immersed in

deionised water to check for lysis. Protoplasts formed were incapable of germinating.

Zebrafish

Macrophage isolation and RNA Extraction

Zebrafish husbandry and infections were performed by Aleksandra Jasiulewicz. Zebrafish

larvae expressing either mCherry macrophages (mCHerry+), GFP neutrophils (GFP+) or

wildtype (AB) were used in the following work. The Zebrafish Larvae, infected and uninfected,

were suspended in fixation solution (10ml 4% PFA solution + 5ml 3% Sucrose), on ice for 10

minutes. 1ml of the fixation solution was used for every 10 larvae. The fixation solution was

then removed and the larvae were dissociated in 1ml of 0.25% Trypsin (preheated to 37°C)

per 10 larvae, the mixture was incubated at 37°C for 10 minutes, mixing via pipetting

periodically. To terminate dissociation, 10% FBS and 1ul of 1M CaCl2 were added per 1ml of

trypsin to the mixture. The solution was then spun at 800G for 3 minutes to pellet the

dissociated cells and remove the dissociation media. The cells were resuspended in an

58

appropriate amount of PBS for sorting (1ml per 10 larvae) and kept on ice until sorting. Sorting

was carried out using a BD FACSaria sorter, cells were sorted based on fluorescent signal when

compared to the signal obtained from wild-type (AB) zebrafish cells. The sorted cells were

then kept on ice (for no longer than 2 hours) until RNA extraction. Total RNA was extracted

following the Recoverall guidelines, modifying the protease digestion step to 3 hours at 50°

(Hrvatin et al. 2014).

59

Chapter 2: Mucorales Spore Germination

Characterisation

This work has been adapted from the book chapter “Spore Germination of Pathogenic

Filamentous Fungi” (Sephton-Clark and Voelz 2017), for which I performed the literature

search, wrote the manuscript, completed revisions, and prepared the figures. Selected results

have been previously published in and “Pathways of Pathogenicity: Transcriptional Stages of

Germination in the Fatal Fungal Pathogen Rhizopus delemar” (Sephton-Clark et al. 2018) for

which I conceived, designed and performed the experiments, collected the data, performed

the analysis and interpretation, wrote the manuscript, completed revisions, and prepared the

figures.

This chapter will introduce the varying germination phenotypes observed across Mucorales

species. Results obtained through live cell imaging, FACS and extracellular vesicle isolation

demonstrate that species within the Mucorales order exhibit a range of germination rates

and physiologies. Phenotypic heterogeneity to this extent has implications for diagnostic

testing, pathogenicity and phylogenetic assignment.

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Germination phenotype diversity

Large variation is seen in spore physiology between fungal species; ungerminated spores may

range in diameter from 2.8 to 8.85um (Reponen et al. 2001; Li et al. 2011), and present in a

variety of shapes from spherical to ellipsoidal (Reponen et al. 2001). Some spores require an

initial swelling/isotropic growth phase prior to hyphal germ tube emergence, the timing of

which also varies between fungal species.

Filamentous fungi rely upon germination to transform from spore form to filamentous form.

Germination may occur at a variety of rates, and optimal germination conditions vary

between species. Aspergillus species will germinate fully using a sugar cane bagasse

substrate, by 13 hours. In comparison, Rhizopus microsporus will germinate under the same

conditions in 11 hours, whilst Myceliophthora thermophila fails to germinate completely

(Hassouni et al. 2007). For a single species such as Aspergillus niger, environmental

requirements will also govern germination rate. Within an optimal temperature range (19-

45°C) A. niger will germinate in 12 hours, however at a suboptimal temperature range (50-

60°C), A niger fails to germinate (Hassouni et al. 2007). It is unclear how Mucorales spores

germinate in relation to one another, and whether this impacts pathogenicity.

Over the course of germination, the fungal spore wall changes in a dynamic nature. Spore cell

wall components are produced and organized by several cell wall associated enzymes

including chitin synthase and deacetylase, b(1,3)-glucan synthase, a(1,3)-glucan synthase

and Mannosyltransferase for polysaccharide production, with the corresponding transferase

enzymes responsible for remodelling polysaccharide portions of the cell wall (Karkowska-

61

kuleta and Kozik 2015). These enzymes enable constant reorganisation over the course of

germination. The production of melanin in Aspergillus fumigatus is known to require the

ALB1, ARP1/2, ABR1/2, and AYG1 enzymes which make up the dihydroxynaphthalene melanin

pathway (Tsai et al. 1999; Bernard and Latge 2001; Pihet et al. 2009). These enzymes are also

important for restructuring and reorganizing the cell wall throughout germination. They also

play large roles in the production of filaments, as well as the production of new spores

themselves. The Aspergillus fumigatus genes chsC,G&E, all encoding for chitin synthases, are

required for proper conidiation, as well as hyphae formation, whilst the functionality of chitin

synthases also appears to be required for the acquisition of melanin to the cell wall of C.

neoformans (Mellado et al. 1995, 1996; Aufauvre-Brown et al. 1997; Tsai et al. 1999; Beauvais

et al. 2001; Anand, Yadav, and Yadav 2016; Tsirilakis et al. 2012). Although the genomes of

Mucorales species show the presence of predicted cell wall remodelling enzymes, the roles

which they play throughout germination is unknown.

The structural changes of germinating Aspergillus fumigatus conidia have been tracked to

show both compositional and spatial changes over this time, a characteristic which is also

observed in Mucorales spores (Figure 2,3,4) (Dague et al. 2008). Over the course of

germination, a loss of hydrophobicity can be seen in Aspergillus, which is due to a

rearrangement of the hydrophobic rodlet outer layer as the Aspergillus conidia

swell. After 2 hours of germination, the hydrophobic rods form

clusters, surrounded by hydrophilic polysaccharides, resulting in a heterogeneous

Aspergillus coat (Dague et al. 2008). Work done in the plant pathogen Phanerochaete

chrysosporium shows a similar trend, as the outer rodlet coat is disbanded over the

course of germination (Dufrêne et al. 1999). The conidial cell wall of the pathogenic

mold Scedosporium boydii also shows a decrease in hydrophobicity over the course of

62

germination, along with a decreasing electrostatic charge, an increased accessibility of

polysaccharides and lectins within the cell wall and a remodelling of cell wall proteins.

Conidial GPI anchored proteins are swapped for hyphae specific GPI anchored proteins over

germination (Ghamrawi et al. 2015). Taken together, the highly dynamic restructuring of the

cell wall of spores as they germinate is dependent on many enzymes and components, which

appear to act cooperatively in order to provide structure and environmental protection. How

these enzymes behave in Mucorales species throughout germination is unknown.

This cell wall remodelling may aid the release of extracellular vesicles (EV), which fungal

species such as Magnaporthe oryzae release over the course of germination (Rybak and

Robatzek 2019). Extracellular vesicles have been implicated in fungal pathogenesis

(Panepinto et al. 2009; Yoneda and Doering 2006)(Alspaugh 2015), and have been reported

to carry RNA, lipids, fungal cell wall components, complex sugars and enzymes (Albuquerque

et al. 2008; Vallejo et al. 2011; Da Silva et al. 2015; Eisenman et al. 2009; Muxing Liu et al.

2018b). Recently Liu et al detected the presence of small RNAs in EVs isolated from R.

delemar (Liu et al. 2018a). sRNAs are thought to play roles in modulating plant-

pathogen interactions (Zhao, Liang, and Zhou 2018) and have the potential to modulate host

immunity in response to infection, proving a potent potential virulence factor. Whilst fungal

EVs often appear to carry cargo implicated in pathogenesis, EVs from Candida albicans have

been shown to offer ‘protection’ in a Galleria mellonella infection model (Vargas et al.

2015). Despite their role, it remains unclear where EVs originate, and exactly how they

traverse the fungal cell wall. Whilst Rodrigues et al propose the cytosol as a potential EV

reservoir, Wolf et al. provide evidence for EV formation via membrane budding

(Rodrigues et al. 2013; Wolf et al. 2014). Recent work has shown that the cell wall

of C. albicans, and C. neoformans, is permeable to vesicles 60-80nm in size. The

viscoelastic properties of the cell wall may therefore allow for EV traversal (Walker et al.

2018). 63

The mechanism by which EVs traverse the cell wall remains unclear, however several

studies have revealed the presence of cell wall degrading enzymes within fungal EVs,

offering a potential mechanism for this understudied process. The release of extracellular

vesicles over the course of germination has been poorly studied to date, and remains

unknown in Rhizopus sp.

The definition of germination varies widely between studies and fungal species, an

approach which standardises the definition and measurement of germination would benefit

the field. For the work presented here, germination is said to have been reached upon the

formation of a hypha, the length of which is greater than or equal to the diameter of the

spore body from which it emerges. The following results address gaps in the literature

regarding comparative germination phenotypes, germination dynamics of the

Mucorales cell wall and extracellular vesicle release.

64

Results

The following results focus on germination phenotypes observed in Rhizopus

delemar, Rhizopus microsporus, Cunninghamella and Lichtheimia (see Chapter1

Figure1, for phylogenetic reference). These species were chosen due to the high frequency

at which they are isolated from mucormycosis cases, and access to clinical isolates of

each species. Germination rates and cell size measurements were determined with live cell

imaging. In all species, there is a significant difference between resting and swollen spore

diameters (Figure 1a, p<0.05), whilst hyphal width and length remains similar

between species (Figure 1b). R. delemar germinates at an increased rate compared to

all other species (Figure 1c), consistent with reports that indicate R. delemar to be

a rapidly germinating species, which might account for the frequent isolation of R.

delemar from mucormycosis cases (Mingfu Liu et al. 2015).

0

5

10

15

20

Dia

met

er (u

M)

A

Restin

g Lich

theim

ia

Restin

g Cun

ningh

amella

Restin

g R. m

icros

porus

Restin

g R. d

elemar

Swollen C

unnin

gham

ella

Swollen R

. micr

ospo

rus

Swollen R

. dele

mar

Swollen L

ichthe

imia

Cell Size and Germination Rate

65

Figure 1. Germination phenotypes vary between Mucorales species. a) Diameter of

resting and swollen spores of: Lichthemia, Cunninghamella, R. microsporus and R.

delemar. N=3 biological repeats per species. 200 spores measured per repeat. Error bars

show standard deviation. All resting vs. swollen pairings showed a significant

difference between spore diameter when a Student’s t- test was applied,

significance represented by asterisk (****=p<0.05). b) Width and Length of

hyphae produced by Lichtheimia, Cunninghamella, R. microsporus and R. delemar spores. c)

Percent germination of Lichtheimia, Cunninghamella, R. microsporus and R.

delemar spores over time (n=1)

0 2 4 60

50

100

Time (hours)

Per

cent

Ger

min

atio

n

Lichthemia

Cunninghamella

R.microsporus

R.delemar

0

2

4

6

8

Wid

th (u

m)

0

50

100

150

200

250

Leng

th (u

m)

B

C Lichth

eimia

Cunnin

gham

ella

R. micr

ospo

rus

R. dele

mar

Lichth

eimia

Cunnin

gham

ella

R. micr

ospo

rus

R. dele

mar

66

The cell wall alters over the course of germination in multiple fungal species (Dague

et al. 2008; Dufrene et al. 1999). Multiple studies have focused on rodlet dynamics in

Aspergillus species as a measure for cell wall restructuring, however the genome

of R. delemar lacks genes with predicted functions in rodlet formation, and SEM

images of Rhizopus arrhizus confirm a lack of rodlets (Wurster et al. 2017). Like other

Mucorales species, the genome of R. delemar appears enriched for chitin synthases (Ma et

al. 2009) and deacetylases (Chibucos et al. 2016), twice as many seen for many dikaryotic

fungi (Ma et al. 2009). For this reason, cell wall chitin/chitinosan content was chosen as

an initial measure of cell wall plasticity over germination. Flow cytometry revealed

dynamic processes which take place within the cell wall over the course of swelling

(Figure 2). Over the 6-hour course of isotropic swelling and germ tube emergence,

CFW staining becomes more intense, indicating that more chitin/chitinosan is available to

the stain. By 6 hours all species show an intense stain for CFW, and both Mucor cbs and

Mucor nrrl (Figure 2. C,D) show slightly increased staining at 0 hours, indicating

that Mucor species display more chitin/chitinosan on the resting spore surface.

Morphology and Cell Wall Dynamics

67

Figure 2

Flow cytometry data displayed as histograms with % of events (Y axis) vs. fluorescence

intensity (X axis). Spores swollen for: 0 hours (red), 3 hours (blue) and 6 hours (yellow) in SAB

broth. Unstained control is represented in grey. a) R. microsporus stained with CFW b) R.

delemar stained with CFW c) Mucor cbs stained with CFW d) Mucor nrrl stained with CFW e)

Cunninghamella stained with CFW f) Lichthemia stained with CFW

A

CFW

B

CFW

C

CFW

D

CFW

E

CFW

F

CFW

68

To better characterise the distinct phases of germination, R. delemar and R. microsporus were

chosen for higher resolution phenotyping. Germination is characterized by three distinct

transitions: dormancy to swelling, swelling to germ tube emergence, and the switch to

sustained filamentous growth. For both species the switch from dormancy to swelling was

triggered by exposure to rich media. Swelling, characterized by an isotropic increase in size,

continued for 4 to 6 h (Figure 3). Once fully swollen, germ tubes emerged from the spore

bodies. Most R.delemar spore bodies (75.5%, Fig. 1C) produced hyphae that exceeded the

diameter of the spore body in length by 4-5 hours, whilst R. microsporus requires 6-7 hours

to reach this point. At this time point, the spores were considered fully germinated. Hyphal

growth was monitored up to the 24 hours post germination initiation for R. delemar to

inform subsequent RNA-Seq studies.

69

Figure 3. Germinating spores exhibit three distinct phenotypes a) Images taken from time

lapse live cell imaging of R. microsporus spores that have germinated for 0-6 hours (left to

right) b) Images taken from time lapse live cell imaging of R. delemar spores that have

germinated for 24 hours.

To determine whether the increase in cell wall staining observed via flow cytometry was due

to the emergence of hyphal buds/tips with high chitin/chitinosan exposure, R. delemar and

R. microsporus spores were imaged after staining with CFW and FITC, to determine the

location on cell wall restructuring. CFW stains specifically for chitin and chitinosan whilst FITC

Swelling

Germ Tube Emergence Hyphal Growth

A

B

B

0 1 2 3 4 5 6

70

specifically binds protein. Both species exhibit an increase in chitin/chitinosan and protein

content uniformly across the spore body throughout germination (Figure 4. A,B). R. delemar

appears to display a reduced quantity of chitin/chitinosan and protein in its hyphal

protrusions (Figure 4a), indicating the process of cell wall restructuring may be especially

important during the initial stages of germination.

Figure 4. Cell wall dynamics. A) R. delemar spores germinated for 0, 3, 6, 12, and 24 h, stained

with calcofluor white (CFW) and fluorescein (FITC). B) R. microsporus spores germinated for

0, 2, 4 and 6 h, stained with calcofluor white (CFW) and fluorescein (FITC).

0 3 6 12 24

CFW

FITC

ROS

0 2 4 6

CFW

FITC

A

B

71

To determine whether Mucorales species also release extracellular vesicles (EVs) over

germination, as has been reported in other species (Rodrigues et al. 2008), an EV isolation

protocol was applied to the supernatant of germinating R. delemar spores. EVs were

successfully isolated and the size of these particles determined. The concentration of

EVs isolated increases post germination initiation (Table 1) and after 4 hours, the size of

the particles released increases significantly, with the average size for 0-2 hours being

2.74nm and the average size for 4-6 hours being 269nm (Figure 5), however the charge

remains neutral (Table 2). pH has been shown to influence charges across EV membranes,

therefore influencing EV ability to fuse with external cells via micropinocytosis (Yáñez-Mó et

al. 2015). As germinating R. delemar spores are able to germinate in a range of pHs, and may

influence the pH of their microenvironment as they do so, effective EV cargo delivery may

be altered depending on germination stage or environment.

Extracellular Vesicle Release

72

Figure 5. Extracellular vesicles are detected from spores which have germinated for

4-6 hours. Graph showing extracellular vesicle (EV) size profiles of EVs isolated from

Rhizopus delemar spores germinated for 0-6 hours, data derived via dynamic light

scattering (dls) analysis. Dls allows the size of particles dispersed in a liquid to be

derived from the scattering of a laser beam.

0

5

10

15

20

25

30

0.4

0.6

1.0

1.5

2.3

3.6

5.6

8.7

13.5

21.0

32.7

50.8

78.8

122.4

190.1

295.3

458.7

712.4

1,106.0

1,718.0

2,669.0

4,145.0

6,439.0

10,000.0

Volume (%)

Size (nm)

0-6 hour averages

0 hour averaged 0.5 hour averaged 1 hour averaged

2 hour averaged 4 hour averaged 6 hour averaged

73

Condition Average Concentration (particles/spore) 0 hour 3.78 1 hour 10.40 2 hour 7.87 4 hour 8.96 6 hour 16.99

Table 1: showing the concentrations of EVs from spores germinated in SAB, recorded by nano sight.

Condition Average charge (mV) 0 hour -19.750.5 hour -12.831 hour -11.432 hour -11.484 hour -11.496 hour -12.06SAB control (no spores present) -14.82

Table 2: showing the charge of the isolated EVs from spores germinated in SAB, recorded by

zetasizer. By applying an electric field to particles analyzed by dynamic light scattering, the zeta

potential (potential difference across phase boundaries, measured in mV) was determined.

Conclusions

The species studied here display similar spore and hyphae sizes throughout

germination. Conversely, germination timing is varied between Mucorales species

(Figure 1c). Despite timing differences, the germination phenotype of swelling, germ

tube emergence and finally hyphal growth appears conserved across the species

studied. Trends in cell wall component (chitin/chitinosan and protein) exposure

varies between species. Closely-related species exhibit similar exposure patterns to one

another over germination (Figure 2: Mucor cbs and Mucor nrrl), however these patterns

are distinct from other species. Finally, germinating Rhizopus delemar spores were found

to release extracellular vesicles after 4-6 hours (Figure 5). Small particle peaks (1-4nm)

were also detected from spores that germinated for 0.5-2 hours, however given the

size, these peaks likely represent artifacts or cell wall components. These results and the

potential for further work will be discussed here.

74

Discussion

The phenotypic variation over germination highlights the broad phylogeny of the Mucorales

order, which has been better described taxonomically through DNA based reclassification

(Hoffmann et al. 2013; Gryganskyi et al. 2010; Abe et al. 2007). The species studied here

display similar resting spore, swollen spore and hyphal sizes (Figure 1a,b), thus making

diagnosis difficult through single time point imaging alone (Yang et al. 2016). However the

differential germination dynamics of these species (Figure 1c, 2) might provide a cost

effective alternative for diagnosis through multiple time point imaging and cell staining. All

species appear to undergo cell wall remodelling during germination (Figure 2, 4), however

the extent to which each species remodels is variable. Cell wall remodelling and unmasking

in response to pH has been linked to pathogenicity in Candida albicans (Sherrington et

al. 2017), and it may be possible that the variation in remodelling of these species is

linked to variation in pathogenicity. The known Mucorales pathogenicity factor CotH

resides within the cell wall of pathogenic Mucorales species, and unmasking of

this factor over germination may result in increased pathogenicity. This would support the

observation that swollen Mucorales spores are more pathogenic than ungerminated

ones (Chibucos et al. 2016). Mucorales cell wall remodelling may occur in response to pH

changes, as we see for the pH dependent recruitment of aquaporins over germination

(Turgeman et al. 2016). The EV data shown here adds to the sparse literature on fungal EV

release over germination. It is likely that these EVs contain sRNAs (Liu et al. 2018b),

however they may include other components such as enzymes or pathogenicity

factors which might aid environment dependent colonisation. Both seedlings and

neutrophils have been shown to release EVs capable of interacting with their respective

fungal pathogens (Sclerotinia sclerotiorum and Aspergillus fumigatus) to inhibit growth

(Regente et al. 2017; Shopova et al. 2019).

75

It is possible that Rhizopus delemar might release EVs in a similar manner to ensure spore

survival and propagation, despite environmental responses to the spores.

Further Work

This field would benefit from further work focusing on the impact of environment

on germination. Most fungal germination studies use rich media, however this does not

reflect the ‘real world’ environments which many fungi have evolved to inhabit.

Studies which address germination phenotypes in a range of ‘realistic’ media (soil,

blood, guano etc.) would greatly increase our understanding of how these pathogens

interact with their surroundings, and advance our understanding of their pathogenesis.

This work would also benefit from an in-depth analysis of the precise alterations which

occur in the Mucorales cell wall over germination, and any molecules they may secrete (eg

EVs). High resolution mass spectrometry and scanning electron microscopy would allow

these areas to be explored further.

76

Chapter 3: Hallmarks of the Mucorales genome

Results have been previously published or adapted from the following articles: “Pathways of

Pathogenicity: Transcriptional Stages of Germination in the Fatal Fungal Pathogen Rhizopus


Mucorales and their endosymbionts: a polymicrobial pas de trois” (Sephton-Clark et al.

2019). For both I conceived, designed and performed the experiments, collected the data,

performed the analysis and interpretation, wrote the manuscript, completed revisions, and

prepared the figures.

This chapter will introduce characteristics of the Mucoralean genome. Results describing

genome assembly, annotation and comparisons of two Mucorales species, Rhizopus delemar

and Rhizopus microsporus, show the conservation of a core set of fungal features, but

divergence between the two genomes in enrichment of substrate binding, transporter

activity, endosome activity and DNA repair.

77

Mucoralean Genomics

Previously Rhizopus oryzae was reclassified into two species based on the ability to produce

either fumaric-malic acid or lactic acid. Strains capable of producing fumaric-malic

acid were reclassified as the species Rhizopus delemar. This reclassification led to two

distinct clusters, when ribosomal DNA from both Rhizopus oryzae and the newly proposed

Rhizopus delemar was used to determine a phylogenetic relationship between the two (Abe

et al. 2007). This work is supported by findings from Chibucos et al (Chibucos et al. 2016),

who identify two distinct clusters (Figure 1) within Rhizopus species, based on whole

genome sequences.

Figure 1. Figure and legend from “An integrated genomic and transcriptomic survey of

mucormycosis-causing fungi”, Chibucos et al. 2016 (Chibucos et al. 2016). a) SNP-based

whole-genome maximum-likelihood phylogeny of all 13 R. delemar and R. oryzae strains. All

nodes have a bootstrap value of ≥97 out of 100. b) Population structure inferred using the

program Admixture. Values represent fraction of population ancestry denoted by colours:

green (R. delemar) and blue (R. oryzae).

78

Prior to reclassification, the genome of Rhizopus oryzae 99-880 (now Rhizopus delemar 99-

880) was sequenced and assembled from whole genome shotgun library sequencing data by

Ma et al. (Ma et al. 2009). Although transcriptomic data was not available for assembly and

annotation, the resulting assembly identified the 45.26Mb genome to be repetitive (20%

transposable elements), and consisting of 13,895 protein coding genes. A whole genome

duplication event, followed by subsequent gene duplication events, indicated by the

segments of duplicate gene pairs scattered throughout the genome, resulted in multiple gene

family expansions. These gene families have roles in ergosterol biosynthesis, cell growth,

signal transduction, protease secretion and subtilase secretion (Ma et al. 2009). Notably,

analysis revealed a lack of the common siderophore producing non-ribosomal peptide

synthases, highlighting R. delemar’s reliance on Rhizoferrin for iron scavenging. This is

especially relevant in the context of this species’ requirement for iron in order to germinate,

and its implications in pathogenesis (Ibrahim et al. 2007; Andrianaki et al. 2018; Kousser et

al. 2019).

The chitin deactelyase family is also expanded in R. delemar, compared to non-early divergent

fungi, as it is for other mucoralean species. There appear to be 2,658 core clusters present in

the 19 Mucorales species included in the analysis carried out by Chibucos et al. We see that

there is a range of genome sizes in this study, with the smallest genome consisting of 22.3Mb,

whilst the largest is 96.7Mb. Highly pathogenic Mucorales species from this study were found

to contain a unique set of 174 genes, conserved in Rhizopus species but lacking in non-

Rhizopus species and thus labelled as putative virulence genes. Amongst the virulence genes

conserved across the Mucoralean family, CotH, which codes for a surface protein uniquely

expressed by Mucoralean species, is present in varying copy numbers between Mucorales

79

79

species. The genomes of Rhizopus delemar, Rhizopus oryzae and Rhizopus microsporus and

Lichtheimia corymbifera all contain over 6 CotH genes, whilst other Mucorales species contain

fewer than 6. The number of CotH genes present has been linked directly to pathogenicity,

however species containing fewer than 6 copies, such as Mucor circinelloides, may still cause

mucormycosis (Chibucos et al. 2016). It is clear that CotH plays an important role in

virulence, however it does not account for all interactions between Mucorales species and

host.

Aside from CotH, few key pathogenicity genes/characteristics have been identified within all

Mucorales species. Around 54% of clinical Mucorales isolates are were found to harbour

bacterial endosymbionts from the Burkholderia family in a study carried out by Ibrahim et

al. (Ibrahim et al. 2008), and though previous work demonstrated that the presence of

these endosymbionts did not impact infection of endothelial cells (Ibrahim et al. 2008),

recent work by Itabangi et al (Itabangi et al. 2019) has shown that the bacterial

endosymbiont within Rhizopus microsporus impacts the fungus’ interaction and

regulation of the host immune system. A bacterial endosymbiont also impacts sexual

reproduction in R. microsporus (Mondo et al. 2017), demonstrating the unique relationship

crucial to development and pathogenicity between Rhizopus microsporus and its bacterial

endosymbiont.

Although several genome sequences exist for Rhizopus microsporus (Horn et al. 2015;

Mondo et al. 2017) a comprehensive analysis of the genome is not available. It is

unknown whether Rhizopus microsporus underwent a whole genome duplication, similarly

to Rhizopus delemar. The following results will provide a thorough analysis of both the

Rhizopus microsporus and Rhizopus delemar genome, and include results based on

comparative genomics analysis carried out to compare the two species.

80

Genome Statistics

Size (Mb) GC% Protein rRNA tRNA Gene Rhizopus delemar

45.32 35.6 17,459 5 239 17,703

Rhizopus microsporus

25.53 37.7 10,891 Not predicted

70 10,959

Results

We utilized our RNA-Seq data to revise the current annotation of the available R.

delemar genome (revised GFF file available at: https://github.com/psephtonclark/

RhizDeleAnno), using BRAKER 2.1.0 (Hoff et al. 2016) to improve gene structures and

incorporate these into an updated annotation. Compared to the previous annotation (Ma et

al. 2009), this updated set included 475 new predicted genes, 370 new protein family

domains (Pfam terms), 103 new pathway predictions (KEGG-EC), and 96 new

transmembrane domains (TMHMM terms) (Figure 2). The updated annotation was assessed

for completeness with BUSCO v3 (Simão et al. 2015) and was shown to include a good

representation of expected core eukaryotic genes, with minimal missing BUSCOs

(benchmarked universal single-copy orthologues) (2%)

Resulting Characteristics of the Reannotated R. delemar Genome

81

Figure 2. Table displaying genome annotation statistics, comparing the original R. delemar

annotation (column 1, ‘Vesper Annotation’) and the annotation updated with our RNA-Seq

data (column 2, ‘‘Vesper Annotation with RNA Seq data incorporated’’).

Biochemical Pathways Present in R. delemar

A custom genome database for R. delemar was created with PathoLogic to allow for

PathwayTools analysis of the reannotated R. delemar genome (Database available at

https://github.com/psephtonclark/rhior3cyc). From this, metabolic, signalling and

transporter pathways can be visualised with the PathwayTools GUI (Figure 3). This annotation

classified genes with predicted or known functions into the following categories: Enzymatic

reactions (2061), Transport reactions (13), Activation/inactivation pathways (4), Biosynthesis

pathways (166), Degradation pathway (93), Detoxification pathway (8), Precursor Metabolism

(20), Macromolecule Modification pathway (4), Metabolic cluster (6), Superpathways (31).

This annotation also identified 4377 enzymes, 93 transporters and 1517 compounds. These

-

82

pathways and molecules have been visualized in Figure 3. All pathway predictions are based

on genomic information. Annotations of model fungal species inform these predictions,

therefore the predictions will be more accurate, the more closely related the species are.

Key metabolic pathways identified include:

• Carbohydrate Biosynthesis and degradation(sugar, polysaccharide, oligosaccharide)

• Amino Acid Biosynthesis and degradation (polyamine, proteinogenic, modification, b alanine

biosynthesis, L-citrulline biosynthesis, L-Ornithine)

• Fermentation and alcohol degradation

• Respiration

• Glycolysis

• TCA Cycle

• Lipoate biosynthesis

• NAD/NADP metabolism

• Polyprenol biosynthesis

• Porphyrin compound biosynthesis

• Tetrahydrobiopterin biosynthesis

• Tetrapyrrole biosynthesis

• Vitamin biosynthesis

• Secondary Metabolite biosynthesis and degradation (Phenylpropanoid, Sugar derivative, Terpenoid)

• Lipid biosynthesis and degradation (choline, FA, phospholipid, sphingolipid, sterol)

• Aminoacyl-tRNA charging

• Nucleoside/tide biosynthesis and degradation

• Aldehyde degradation

83

Figure 3. Pathway visualization based on the R. delemar genome. The PathoLogic database required to generate this can be found in the

online appendix (https://github.com/psephtonclark/rhior3cyc). This annotation was developed via the following

method: predicted gene functions were incorporated into the PathoLogic annotation. Pathways were predicted as described by Karp et al

(Karp et al. 2002), and can be visualized with the PathwayTools GUI. For each prediction there is information available detailing

compound structure, enzymatic reactions and other metabolic functions. Metabolomic and transcriptomic data can be overlaid onto the

annotation, thus pathways up/down regulated (condition dependent) will be highlighted in various colors (this example shows pink, green,

orange and red representing pathways down regulated in hyphal, swelling, germination initiation - 1hr, and resting spores - 0hr, respectively).

= amino acids, = carbohydrates, ◇ = proteins, 0 = purines, = pyrimidines, ▽ = cofactors, T = tRNA's, ⃝ = other

Detoxification

AldehydeDegradation

CarboxylatesDegradation

Nucleosides and Nucleotides Degradation

TCA cycle

Amines and PolyaminesDegradation

Secondary MetabolitesDegradation

Fermentation

Cofactors, Prosthetic Groups, Electron Carriers Biosynthesis

Carbohydrates Degradation

Amino Acids DegradationAminoacyl-tRNA Charging

Nucleosides and Nucleotides Biosynthesis

Metabolic RegulatorsBiosynthesis

Amino Acids Biosynthesis

Other

Degradation/Utilization/Assimilation - Other

Alcohols Degradation

Respiration

Carbohydrates Biosynthesis

Fatty Acid and Lipid Biosynthesis

Secondary Metabolites Biosynthesis

Fatty Acid and Lipids Degradation

Polymeric CompoundsDegradation

Glycolysis

Inorganic Nutrients Metabolism

Amino AcidsCarbohydratesProteinsPurinesPyrimidinesCofactorstRNAsOther

(Filled) Phosphorylated

Rhior_1224DownRhior_26DownRhior_1DownRhior_0Down

Rhizopus delemar RA 99-880 Cellular Overview

This diagram was automatically generated by SRI International Pathway Tools version 21.0, authors S. Paley and P.D. Karp.

84

□△ 0

Previous work determined R. delemar is likely to have undergone a whole genome

duplication, followed by multiple individual gene duplication events (Ma et al. 2009).

The preservation of duplicated genes suggests a specific function for each gene in the pair

may have developed. Enriched functions of duplicated gene pairs which occur

throughout the genome were determined by testing for significant enrichment of pair

GO terms. The genome appears enriched for gene pairs with predicted functions in

succinate metabolism, pigment metabolism, cell cycle, amine metabolism, glycosylation,

carbohydrate metabolism, cofactor metabolism, sulphur metabolism, coenzyme

metabolism, RNA polyadenylation, asparagine metabolism, mitochondrial transport and

cellular component biogenesis (Figure 4).

Figure 4. Plot representation of GO terms of duplicated gene pairs enriched in the R.

delemar genome. The X and Y axis represent semantic space based on ReviGO. The size

of the dots correspond the enrichment significance (P Value, Hypergeometric Enrichment).

Glycosylation Pigment Metabolism & Biosynthesis

Succinate Metabolism

Cell Cycle Carbohydrate Metabolism

Mitochondrial Transport

Cellular Component Biogenesis

Abiotic Response

Coenzyme Metabolism

ROS and SOD Metabolism

Methylation Sulphur Metabolism

Cofactor Metabolism

M Phase

Sulphur Compound Biosynthesis

Amine Metabolism RNA

Polyadenylation

Asparagine Modification

R. delemar WGD Enrichment

85

R. microsporus Genome Assembly and Statistics

A genome assembly of R. microsporus was produced with SPAdes, using short read data as

input. For this, Mondo et al’s assembly was taken as a reference (Mondo et al., 2017),

producing an assembly with 4778 contigs. With a GC content of 37.7% (Figure 5), our assembly

appeared identical to that produced by Mondo et al. The low resolution of the assembly

produced (4778 contigs) is likely due to the lack of long read information and likelihood of a

highly repetitive genome, which increases the difficulty of contig joining when relying on short

read data alone. As Mondo et al’s assembly achieved a higher resolution (131 scaffolds) by

making use of long read data, I used this assembly, but replaced nucleotides identified as

SNPs (Figure 6) in our R. microsporus strain, to produce a reference genome specific to the

R. microsporus strain used throughout the project (University of Birmingham R. microsporus

strain). Briefly, I did this by aligning the raw reads obtained through short read sequencing to

the assembly produced by Mondo et al. I then called variants present when comparing the

sequence of the assembly to the aligned reads. I then inserted the variant nucleotides from

our strain into the assembly, in place of the previous nucleotides. In total, 6132 SNPs were

identified and replaced (Figure 6).

86

Scaffolds

# contigs 4778

# contigs (>= 1000bp) 1096

# contigs (>= 5000bp) 577

# contigs (>= 10000bp) 491

# contigs (>= 25000bp) 313

# contigs (>= 50000bp) 172

# Total length (>= 0bp) 30030542

# Total length (>= 1000bp) 25509162

# Total length (>= 5000bp) 24582835

# Total length (>= 10000bp) 23970496

# Total length (>= 25000bp) 20979206

# Total length (>= 50000bp) 15886454

Largest contig 235405

Total length 27890444

Reference Length 25972395

GC% 37.77

N50 61180

NG50 66773

N75 25555

NG75 31831

L50 138

LG50 123

L75 311

LG75 261

# N's per 100 kbp 1.33

Figure 5. Genome statistics and visual representation for the genome assembly of

R. microsporus, produced with SPAdes, based on short reads only. All contigs are displayed

and demonstrate the poor quality of the assembly. A small section of the assembly has been

magnified to display the large number of short contigs incorporated into this fractured

genome assembly.

87

Figure 6. Single nucleotide polymorphisms and indels identified when comparing Mondo et al’s assembly to

aligned reads representing the UoBirmingham R. microsporus strain. The IGV graph (top) demonstrates that

Variants (blue columns corresponding to genome location of variants) were identified across the entire genome.

To generate this, the UoB R. microsporus VCF file (variant call data) was aligned against the Mondo et al R.

microsporus genome. Variants highlighted in blue.


R. delemar genes with homology to genes in R. microsporus were identified via blast+. A

comprehensive list of these genes can be found in the online appendix

(https://github.com/psephtonclark/RhizoOrthologues). 8,356 genes were identified with a

bit score > 90 (E Value < 1 x 10-20) and a percentage identity match of over 60% (Pearson,

2013). 2,121 highly conserved genes were found (identity % > 80%), and those with an identity

percentage of over 90% (234 genes) had roles in ribosome structure, translation, protein

metabolism, phosphorus metabolism, organelle structure, transcription, respiration, ATP

metabolism, sugar metabolism, catalytic activity, ion transport and binding.

Fisher's exact test identified enriched Pfam terms when the genome contents of R.

delemar and R. microsporus are compared. Compared to R. microsporus, the genome of R.

delemar is

88

Scaffold 1 Scaffold 131

enriched for genes with protein domains (PFAM) associated with ion binding, carbohydrate

derivative binding, nucleic acid binding, cytoskeletal protein binding, poly(A) binding, NAD+

ADP-ribosyltransferase activity, protein kinase C activity, translation initiation factor binding

and inorganic phosphate transmembrane transporter activity (Figure 7). R. microsporus is

enriched for genes with protein domains corresponding to nucleoside phosphate binding,

early endosome activity and DNA repair complex activity (Figure 7).

Figure 7. Pfam terms enriched (FDR corrected P Value < 0.01) in R. delemar vs

R. microsporus genomes, with colour representing Log10 Count. A list of the top 50 most

significant Pfam terms can be found in the appendix (ComPfam.pdf).

R.delemar

R.microsporus

PF13041PF12773PF12796PF16619PF18439PF16983PF16589PF16363PF16159PF14575PF13855PF13555PF10805PF01061PF00454PF00488PF02724PF17921PF17675PF16118PF14662PF13567PF13479PF13428PF09972PF10779PF17862PF17817PF16367PF13533PF13424PF13417PF12799PF11932PF00091PF02786PF12760PF13173PF16842PF16588PF13843PF12330PF10500PF10662PF13304PF13426PF14362PF00036PF18345PF09726PF13561PF13472PF00013PF13401PF13920PF03142PF05347PF00505PF12894PF13191PF00176PF01498PF07714PF05175PF07728PF14510PF03009PF00107PF13176PF12550PF00173PF07647PF00433PF04851PF03144PF00564PF13014PF12854PF02222PF03810PF00891PF02353PF08477PF08581PF05496PF00158PF05406PF08028PF08726PF00610PF06293PF02689PF02390PF01749PF06367PF02874PF05001PF02770PF08448PF06609PF13232PF09439PF00626PF05673PF01636PF14598PF01163PF13912PF10591PF03602PF08443PF01740PF13429PF02719PF05190PF12895PF00077PF13606PF08284PF00271PF13371PF00690PF00806PF00658PF08282PF13881PF13374PF02796PF03184PF08659PF09011PF00512PF05148PF13504PF01209PF14259PF09668PF13857PF13833PF13812PF03732PF13637PF00025PF01926PF13181PF13518PF00651PF00083PF00005PF07646PF00788PF13551PF08238PF13516PF12762PF08662PF04670PF13650PF00665PF07653PF02992PF07282PF00096PF12937PF00076PF14604PF00071PF00069PF04082PF00153PF14531PF01535PF00098PF07690PF00270PF14529PF00009PF13358PF00400PF13894PF00385PF00078PF03372PF13893

0

1

2

3

4

5

6

89

Comparison with Aspergillus genomes

R. delemar genes with homology to genes in Aspergillus niger were identified via blast+.

A comprehensive list of these genes can be found in the

online appendix (https://github.com/psephtonclark/Orthologues). 13,613 genes were

identified with a bit score > 80 (E Value < 1 x 10-20), of these 2,494 genes had a percentage

identity match of over 50% (Pearson, 2013). Highly conserved genes (155 with

identity % > 80%) had roles in ribosomal processes, translation, transcription, protein

metabolism, enzyme activity (kinase, transferase, hydrolase), ion transport and amine

processing.

Conclusion and Discussion

Through incorporation of RNA-Seq data and short read data, an improved R. delemar genome

and updated R. microsporus genome (specific to the UoB R. microsporus strain) were

produced. The extra R. delemar annotation and duplicated genome information will inform

further RNA-Seq analysis, whilst RNA-Seq analysis of the UoB specific R. microsporus is now

possible. Pathway analysis of the R. delemar genome revealed predicted pathways, which

show minimal missing eukaryotic components (Figure 2). As expected, there appears to be

greater conservation between the R. delemar and R. microsporus genomes, than between the

R. delemar and A. niger genomes. R. delemar does however appear enriched for many more

functions when compared to R. microsporus, a trait which may be explained by the larger

genome size and likely whole genome duplication event. Unsurprisingly, the conserved fungal

gene core shared by R. microsporus, R. delemar and A. niger is highly populated with genes

predicted (GO) to play roles in protein synthesis, a general process highly conserved across

filamentous fungi (amongst other kingdoms). Species-specific genes likely offer an advantage

90

to that species, which may be environment dependent. For example, the enrichment of

endosome activity in the rice seedling blight fungus R. microsporus (Lackner and Hertweck,

2011) may aid plant pathogenesis, as it does in U. maydis (Bielska et al. 2014). The R. delemar

genome appears enriched for phosphate transportation, which may support growth in low

micronutrient conditions. This is consistent with C. albicans reliance upon phosphate transport

in stress and starvation conditions (Ikeh et al. 2017).

Further work

To better our understanding of the Mucoralean genome, DNA sequencing of ‘ultra-long’ reads,

via Oxford Nanopore or PacBio technologies, would allow resolution of highly repetitive

regions, resulting in chromosomal level genome detail. This would inform better gene

predictions and, combined with a whole genome CRISPR-Cas9 knockout library, allow for high

quality functional gene annotations. Knockout library analysis may also reveal novel drug

targets, potentially increasing our ability to treat mucormycosis.

91

Chapter 4: Transcriptional States of Germination


Filamentous Fungi” (Sephton-Clark and Voelz 2017), for which I performed the literature

search, wrote the manuscript, completed revisions, and prepared the figures. Results have

been previously published in “Pathways of Pathogenicity: Transcriptional Stages of

Germination in the Fatal Fungal Pathogen Rhizopus delemar” (Sephton-Clark et al. 2018) for

which I conceived, designed and performed the experiments, collected the data, performed


figures.

This chapter will introduce transcriptional regulation of germination in a range of fungal

species. Results will describe the transcriptional landscape of Rhizopus delemar over

germination. This fine scale RNA-Seq study sheds light on pathways highly regulated over the

course of germination, identifying pathways which could be targeted to inhibit germination,

providing new treatment options for mucormycosis. Dormant spores are shown to be

transcriptionally unique, containing a subset of transcripts absent in later developmental

stages. A large shift in the expression profile is prompted by the initiation of germination,

with genes involved in respiration, chitin, cytoskeleton, and actin regulation appearing

to be important for this transition. A period of transcriptional consistency can be seen

throughout isotropic swelling, before the transcriptional landscape shifts again at the

onset of hyphal growth. In addition, I compare germinating R. delemar spores

(transcriptionally) to germinating Aspergillus niger spores. The results identify a core set

of orthologous genes which show similar expression patterns over germination; however

germinating R. delemar

92

also exhibits a uniquely expressed set of genes. These results provide us with a greater

understanding of the regulation of germination and highlight processes involved in

transforming R. delemar from a resting spore state to a hyphal mass.

93

Germination Regulation

During spore germination, previously dormant spores adapt a metabolically active state that

is characterized by rapid changes in the transcriptional landscape, metabolism, cell wall

composition and cell physiology. Together these changes lead to isotropic growth which is

defined by swelling of the spore and a marked increase in spore size, eventually leading to

hyphal growth. The transcriptional, biochemical and physiological changes that take place

over this time course will be addressed species by species in the following section.

Aspergillus species

Transcriptional profiling of germinating Aspergillus niger shows the largest differences in gene

expression between resting conidia and germlings (Novodvorska et al. 2013; van Leeuwen et

al. 2013). Conidia having germinated for 2 hours (T2), though barely reaching isotropic

growth, show the greatest change in abundances of transcripts of all major classes, when

compared to resting conidia. Dormant conidia were enriched in transcripts involved in protein

synthesis, whilst T2 conidia contained transcripts involved in protein synthesis, energy

production, cell cycle, transcription and translation. Most strikingly, many transcripts present

in resting conidia were completely depleted in all other stages studied, demonstrating that

the largest transcriptional shift appears at the beginning of germination. T4 conidia showed

little alteration in the transcriptional landscape, compared to T2, however metabolic

transcripts, such as the NADPH-dependent carbonyl reductase homologue, appear to be the

most upregulated when compared to T2 (van Leeuwen et al. 2013).

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It has been suggested that resting Aspergillus spp. conidia contain vast quantities of

pre-packaged messenger RNA molecules, ready to be translated into proteins

and cell components essential for growth and metabolism, once dormancy is broken

(Lamarre et al. 2008; Novodvorska et al. 2016). This could explain the vast decrease in

transcripts seen between resting and germinated conidia, accounting for the

rapid conidial germination response. Others have argued that the large quantity of

transcripts present in resting conidia are instead an artifact of conidiation and are

degraded upon germination (van Leeuwen et al. 2013).

Transcripts present in large amounts in dormant conidia, which were swiftly depleted,

play roles in the degradation of internal trehalose stores, as well as mannitol

metabolism, signalling and hydrophobin production. This combination of stored

transcripts are likely useful for both the initiation of germination, as well as conidiation,

which would support a combination of the models proposed above (van Leeuwen et al.

2013; Novodvorska et al. 2013, 2016). Transcripts for heat shock proteins and ROS

protection were also found to be high in dormant conidia and depleted upon

germination. Eight proteins involved in ROS protection were found to be specifically

enriched. These include catalase A, thioredoxin reductase, and mitochondrial

peroxiredoxin (Oh et al. 2010). A triple superoxide dismutase (SOD1,2&3) deletion in

Aspergillus fumigatus resulted in delayed germination, whilst individual deletions

resulted growth inhibition at high temperatures and sensitivity to ROS (Morales

Hernandez et al. 2010; Lambou et al. 2010). This indicates stress response and ROS

signalling is likely crucial to germination initiation.

Conidial Transcripts

95

A similar study analysing the transcriptional landscape of germinating Aspergillus niger

elucidated further information on the metabolic changes during the early stages of dormancy

disruption (Novodvorska et al. 2013). Dormant conidia were shown to possess many

transcripts involved in carbon starvation, trehalose and mannitol biosynthesis. Trehalose

mobilisation and utilisation occurs rapidly at the onset of germination in A. nidulans, as does

mannitol utilisation (Thammahong et al. 2017; Novodvorska et al. 2013), making it likely that

these transcripts were pre-packaged to aid germination initiation. Transcripts involved in

glycerol synthesis and the metabolism of conidial sugar solutes were also abundant in the

dormant conidia and are thought to be important in the immediate onset of germination to

provide energy, as their presence may allow for the immediate access to sugars required for

growth.

The presence of abundant metabolic transcripts and ROS response transcripts within dormant

conidia supports the argument that conidia come with pre-packaged mRNA ready to mobilise

carbohydrates and protect from ROS damage at germination onset. However, these

transcripts may also be required for maintaining dormancy. Internal ROS has been shown to

act as a germination signalling molecule in Colletotrichum gloeosporioides and therefor ROS

responders (SOD, catalase etc.) might aid in dormancy maintenance (Li et al. 2018; Nesher

et al. 2011)(van Leeuwen et al. 2013). Similarly, low concentrations of ATP have been shown

to inhibit trehalase, thus inhibiting trehalose mobilisation and germination initiation

(Thevelein, den Hollander, and Shulman 1982), therefore low levels of metabolic activity

may be required for ATP production to maintain dormancy. For the above transcripts

to play a role in maintaining Aspergillus sp. dormancy, translation would be

96

required; spores of Saccharomyces cerevisiae have been found to contain transcripts

which are constantly translated throughout dormancy, and it has been suggested that

this ongoing expression plays a role in long term spore survival (Brengues, Pintard, and

Lapeyre 2002). If the purpose of conidial transcripts are to aid germination initiation, the

mRNA may be capped and packaged to increase stability. Highly stable mRNA has

been detected in dormant S. cerevisiae spores, these mRNAs were stable for several

months, but rapidly degraded upon germination onset (Brengues, Pintard, and

Lapeyre 2002). If transcripts within the conidia are remnants of conidiation, to

reduce degradation there may be either a lack of degradative enzymes such as

ribonucleases existing freely within the conidia, or these enzymes are kept

compartmentalized, as many fungal species compartmentalise enzymes necessary for

secondary metabolism (Kistler and Broz 2015).

I suspect that there is more than one explanation for the vast transcriptional shift upon

germination initiation. Given that ‘resting’ A. niger conidia show metabolic activity

(Novodvorska et al. 2016), it is likely that selected transcripts are translated during

dormancy (Brengues, Pintard, and Lapeyre 2002). Selected transcripts might play a role in

dormancy maintenance as autoinhibitors do, or by controlling ROS and ATP as previously

discussed. As transcripts are rapidly degraded upon germination and play roles in trehalose

mobilisation, it is likely that some transcripts are also pre-packaged (polyadenylated and

capped) ready for germination initiation, as is seen for S. cerevisiae and M. tuberculosis

(Brengues, Pintard, and Lapeyre 2002; Ignatov et al. 2015). There is less support for

that argument that the transcripts found in dormant spores are artifacts of

conidiation, as the longest lived mRNA in transcriptionally inactive S. cerevisiae has a

half-life of under 100 minutes (Wang et al. 2002).

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Germination Metabolism

Follow up work on the metabolic changes in germinating Aspergillus niger showed that

dormant conidia suspended in water alone exhibited low levels of respiration (Novodvorska

et al. 2016). This either suggests that a nutrient source is less essential for initiating the

process of germination, as can be seen in C. neoformans, or that dormant conidia in fact

maintain a low level of metabolism at all times, as is supported by Brengues et al (Brengues,

Pintard, and Lapeyre 2002). Transcripts involved in oxidative phosphorylation and therefore

respiration, were also shown to be present in dormant A. niger conidia (Novodvorska et al.

2016). Proteomics showed that at early time points, proteins containing the Has domain with

potential aldehyde-lyase activity, proteins with potential enoyl-[acyl-carrier-protein]

reductase activity and proteins with translation elongation factor activity were abundant.

These proteins are suspected to play roles in carbohydrate metabolism, oxidative

phosphorylation and translation, respectively (Novodvorska et al. 2016).

Initial germination relies on fermentation to derive energy, probably from internal carbon

sources such as trehalose. Fermentation rapidly switches to respiration after 25 minutes of

germination. After 60 minutes of germination, glucose uptake can be detected, suggesting

conidia may use their internal carbon sources to support the initial stages of germination,

accounting for the metabolic activity measured in water alone (Novodvorska et al. 2016). An

array of glucose and hexose transporters (An02g03540, An15g03940, An05g01290,

An16g08940, An02g01270) were upregulated during the early stages of germination, with the

low affinity and high affinity transporters An02g03540 (an A. nidulans homologue) and a mstA

homologue, respectively, appearing most upregulated at the early and later time points

(Novodvorska et al. 2016). Several G protein coupled receptors were also highly transcribed

98

at the early stages of germination (Novodvorska et al. 2016). As G protein coupled receptors

are known to play roles in signalling and nutrient sensing (Choi et al. 2015), it is unsurprising

that several serine and threonine phosphatases, linked with glucose uptake, were also found

to be upregulated at these time points.

The presence of sorbic acid prolonged the fermentation phase of germination in A. niger,

altering the metabolism of several substrates including trehalose and ergosterol

(Novodvorska et al. 2016). The germination of Aspergillus species is also reliant upon

RAS/MAPKinase signalling along with cAMP/PKA signalling in response to nutrients. An

upregulation of amino acid metabolism also appears necessary for germination, as proteins

within germinating Aspergillus fumigatus show a specific requirement for lysine (Osherov et

al. 2002; Lamarre et al. 2008).

Neurospora crassa

A transcriptional study of germination in the model organism and plant pathogen Neurospora

crassa showed similar changes during isotropic growth and hyphal emergence to those

described in Aspergillus spp. (Kasuga et al. 2005). Neurospora crassa will begin to germinate

upon immersion in water with the correct salts and carbon sources. Vogel’s medium

is commonly used to initiate germination in laboratory conditions. This is a medium

that contains: sucrose, water, Na3 citrate, KH2PO4, NH4NO3, MgSO4, CaCl2, trace elements

and biotin. Germination results in swelling of the irregular spores, followed by changes in the

cell wall composition and hyphal formation, with most conidia possessing hyphae

at around 4 hours (Kasuga et al. 2005). Biochemical analysis has shown that in the time

immediately after germination induction, internal stores of carbon such as trehalose and

glutamic acid are

99

released and degraded (Kasuga et al. 2005). Transcriptionally, major differences were seen

between resting and germinated spores (Kasuga et al. 2005). Conidia-specific genes such as

the light responsive con-6 and 10, as well as 8, are enriched in resting conidia, but swiftly

depleted after germination (Kasuga et al. 2005), whilst internal amino acid stores are also

rapidly degraded following the initiation of germination. After 30 minutes of germination,

processes such as glucan and chitin synthesis, DNA processing and heat shock protein

production peaked, whilst after 1-4 hours of germination, germlings were enriched in

transcripts involved in RNA synthesis, DNA processing, ribosome biogenesis, protein

biosynthesis, amino acid biosynthesis and enzymes & proteins involved in cellular

transportation (Kasuga et al. 2005). Interestingly, the peak in amino acid production

correlates with the restoration of amino acid stores at around 3 hours post germination

induction. Respiratory transcripts peaked after 8-16 hours of germination (Kasuga et al. 2005),

correlating with the observation that oxygen consumption commences after 2-4 hours of

germination (Kasuga et al. 2005; Schmit and Brody 1976).

Fusarium species

The conservation of cellular reprogramming during germination is further evidenced by the

protein content present in germinating conidia of Fusarium oxysporum. At early time points

(3 hours), germlings were enriched for proteins involved in metabolic processes, redox

processes, RNA processing, transcription and translation. Later time points (7-11 hours)

showed an increase in proteins associated with ergosterol biosynthesis (Deng et al. 2015).

Several conidiation and germination essential proteins and factors are known to exist for the

plant pathogen Fusarium graminearum. GEA1 (Germinated Ascospores 1) is essential

for normal conidia production, as well as development of the ascus wall, in which the conidia

100

are contained (Son, Lee, et al. 2013). The gene FgATG15 also appears to be essential for

normal conidia formation, as mutants produce abnormally shaped conidia. In addition,

FgATG15 is required for the turnover of stored lipids, a process often essential for

germination (Nguyen et al. 2011). Similarly to other filamentous fungi, the production

of conidia in Fusarium graminearum relies upon the presence of an AbaA (Aspergillus)

orthologue, known to be involved in the regulation of cell cycle pathways, regulating

these processes through the conserved AbaA-Weta signalling pathway in Aspergillus spp.

and Fusarium sp. (Son, Kim, et al. 2013).

In summary, the timings of general mechanisms such as translation, metabolism and DNA

synthesis correspond well between N. crassa and Aspergillus spp. Interestingly, the timing of

more specific processes such as heat shock protein production also appears conserved

between species. It has been suggested that the presence of heat shock proteins at these

early stages in Neurospora crassa aids the correct folding of newly synthesized proteins

(Osherov et al. 2002; Kasuga et al. 2005). Similarities between transcriptional changes over

germination have also been found when comparing data from this study to changes seen in

germinating D. discoideum and U. maydis (Zahiri, Babu, and Saville 2005). Together with the

similarities seen in Aspergillus spp., this suggests the broad transcriptional changes seen

over the course of germination are highly conserved between fungi and other eukaryotes,

indicating that a 'core germination program' which evolved prior to recent eukaryotic

species divergence, may exist (Kasuga et al. 2005).

Mucorales

It has been shown that the fatty acid composition of Mucor rouxii is altered over

the course of germination, with quantities of gamma linoleic acid increasing over

101

germination, whilst other fatty acids fluctuate over germination (Khunyoshyeng et al. 2002).

The content of chitin synthase also increases over the course, predominantly under aerobic

conditions, thought to provide chitin to the cell wall as the spores swell and the cell wall

expands (Kamada, Bracker, and Bartnicki-Garcia 1991). It is known that Mucor

circinelloides relies in part in the Atf1/2 (putative transcription factors) pathway to

germinate within phagocytes (Pérez-Arques et al. 2019), and aquaporin recruitment is

required for germination of Rhizopus delemar (Turgeman et al. 2016). Aside from the

transcriptional profiles described above, the transcriptional landscape of germinating

fungi has been largely unexplored, and remains understudied for Mucorales species.

102

Results

In order to address this gap, I performed a transcriptional analysis of Rhizopus delemar spore

germination. My phenotypic analysis of spore germination (Chapter 2, Figure 3b) established

the temporal pattern for the development of spores from dormancy to filamentous growth.

These dramatic morphological changes require vast cellular reprogramming. I performed

transcriptional analysis of each stage outlined in this process (Chapter 2, Figure 3b). For high-

resolution capture of the transcriptional regulation of spore germination, mRNA was isolated

and sequenced from resting spores (0 h), swelling spores (1, 2, 3, 4, and 5 h) and during

filamentous growth (6, 12, 16, and 24 h). Three biological replicates were produced for each

time point, and mRNA from each sample was sequenced with Illumina HiSeq technology, with

100-bp paired end reads. Reads were aligned to the R. delemar genome (Ma et al. 2009),

giving an average alignment rate of over 95% per sample, with an average of 68% (12,170

genes) of all genes expressed over all time points. Genes which were never expressed in this

time course likely have roles in other processes, such as sexual reproduction, or may be

expressed under specific conditions, such as nutrient starvation.

Transcriptional Trends over Germination

Principal-component analysis (PCA) of TMM (trimmed mean of M-values) normalized read

counts per gene (Figure 1) showed that the biological replicates grouped closely together,

with time points grouping into 3 clusters separated by time (principal component 1 [PC1]) and

stage (PC2), as determined by k-means clustering).

103

Figure 1. Principal-component analysis of 7,942 genes differentially expressed across all time

points (n=3 for each time point; T = 0, 1, 2, 3, 4, 5, 6, 12, 16, or 24 h post-germination). Each

time point is colour coded.

In examining the overall transcriptional profiles of our cells, we observed a set of 482

transcripts that were only expressed in ungerminated spores (Figure 2,3), representing 3.76%

of total transcripts expressed in ungerminated spores (Figure 2). As a result, genes expressed

in resting spores account for 71.5% of all genes in the genome, whereas the highest

percentage of the genome covered by germinated spores is 68.8% (Figure 2). Resting-spore

specific transcripts that were co-expressed (across all samples, n=3) have predicted roles in

lipid storage and localization, as well as transferase activity on phosphorous-containing

compounds (Figure 3). As these transcripts are absent in germinated spores, they may have

roles in the maintenance of spore dormancy.

104

Figure 2. Number of genes expressed (10 or more transcripts present) at germination time

points (t = 0,1,2,3,4,5,6,12,16 and 24 hours). Percentage was determined by dividing the

number of genes expressed (10 or more transcripts) at each time point by the total number

of genes within the genome, and multiplying by 100.

0 1 2 3 4 5 6 12 16 24

Percentage of Genes with Transcripts Detected

Time

% o

f gen

es e

xpre

ssed

020

4060

8010

0

12794

12050 1196512190 12184 12276 12260 12170 12087

12312

105

Figure 3. Resting-spore-specific expression. a) Heat map displaying the absence (blue) or

presence (red) of 10 or more transcripts for a given gene over time. The average percentage

of the transcriptome expressed at any given time point is given below. b) Co-expression

between all T0 samples (n=3), where each node represents a gene only expressed in

ungerminated spores. Nodes linked (by grey lines) to 10 or more others are highlighted in

yellow, with their functions shown adjacent.

106

A series of analyses were performed to identify the transcriptional changes occurring during

spore germination. Principle component analyses highlighted that the fungal transcriptome

displayed a time-dependent shift across 3 major clusters corresponding to the phenotypic

developmental stages swelling, germ tube emergence, and hyphal growth, indicating that

spore germination is underpinned by progressive shifts in transcriptional regulation (Figure

4,5). The transcriptome of resting spores was distinct from that of all other developmental

stages, changing dramatically between 0 and 1 h. Thereafter, the transcriptional profiles of

swelling spores and of those developing germ tubes were distinct but clustered together (2

to 6 h). Furthermore, fully established filamentous growth was characterized by a specific

transcriptional signature (12, 16, and 24 h) (Figure 4,5). Consistent with stage-specific

transcriptional changes, progressive change in differential gene expression was observed

during examination of the transcriptional profiles of each time point.

Differential Expression Throughout Germination

A total of 7,924 genes were differentially expressed across the entire time course (Figure 5a).

Analysis of differentially expressed genes by k-means clustering identified seven major

clusters of expression variation over time (Figure 5a,b). Genes in clusters 1 and 3 are

expressed at low levels in resting spores, with abundance increasing upon germination (1 h)

(Figure 4b). Both clusters are enriched (hypergeometric test, corrected P value of < 0.05) for

transcripts with predicted roles in regulation of the cytoskeleton, protein metabolism, the

electron transport chain, translation, and sugar metabolism (Figure 5c), suggesting these

processes are important for germination initiation. Clusters 4 and 6 show gene expression

levels moving from low to high over time, peaking during hyphal growth (Figure 5b). These

clusters are enriched (hypergeometric test, corrected P value of < 0.05) for transcripts with

107

predicted functions related to kinase, transferase, transposase, and oxidoreductase activities,

along with pyrimidine and phosphorous metabolism, stress response, transport, and

signalling (Figure 5c). This is consistent with the established roles for these processes in

starting and maintaining vegetative growth (van Leeuwen et al. 2013; Balmant, Sugai-guérios,

and Coradin 2015; Yao et al. 2016). Cluster 5 contains genes that have high expression levels

in both ungerminated spores and the hyphal form, but low levels during initial swelling (Figure

5b). Cluster 5 is enriched (hypergeometric test, corrected P value of < 0.05) for transcripts

with predicted functions in regulation of the cytoskeleton, transferase and hydrolase

activities, and phosphorous metabolism (Figure 5c). This suggests that these functions may

be repressed during isotropic growth to maintain swelling. Clusters 7 and 2 contain genes

with expression levels peaking in ungerminated spores (Figure 5b). These clusters are

enriched (hypergeometric test, corrected P value of < 0.05) for transcripts with predicted

functions relating to glycerone kinase, pyrophosphatase, transferase, hydrolase, and

oxidoreductase activities, as well as cofactor and coenzyme metabolism, pyrimidine, sulfur,

nitrogen, sugar, and aromatic compound metabolism. These clusters are also enriched for

reduction-oxidation (redox) processes, respiration, and stress responses (Figure 5c). Notably,

every cluster is enriched for transcripts involved in ion transport regulation, specifically

potassium, sodium, and hydrogen ions. This suggests tight regulation of transmembrane

transport of these particular ions is important for the survival of R. delemar.

108

Figure 4. Heatmap displaying sample correlation. R. delemar samples (T0-T24, n=3) are

hierarchically clustered based on gene expression patterns (Grabherr, Brian J. Haas,

Moran Yassour Joshua Z. Levin, Dawn A. Thompson, Ido Amit, Xian Adiconis, Lin Fan,

Raktima Raychowdhury, Qiandong Zeng, Zehua Chen, Evan Mauceli, Nir Hacohen, Andreas

Gnirke, Nicholas Rhind, Federica di Palma, Bruce W., and Friedman 2013). Colours

represent sample correlation, red = similar, green = dissimilar.

cond_0

cond_1

cond_2

cond_3

cond_4

cond_5

cond_6

cond_12

cond_16

cond_24

cond_0

cond_1

cond_2

cond_3

cond_4

cond_5

cond_6

cond_12

cond_16

cond_24

cond_1_rep1

cond_1_rep2

cond_1_rep3

cond_2_rep1

cond_2_rep2

cond_2_rep3

cond_0_rep1

cond_0_rep2

cond_0_rep3

cond_3_rep3

cond_4_rep3

cond_3_rep2

cond_4_rep2

cond_5_rep3

cond_6_rep3

cond_5_rep2

cond_6_rep2

cond_5_rep1

cond_6_rep1

cond_3_rep1

cond_4_rep1

cond_24_rep1

cond_12_rep2

cond_24_rep2

cond_24_rep3

cond_12_rep1

cond_16_rep1

cond_12_rep3

cond_16_rep2

cond_16_rep3

cond_1_rep1cond_1_rep2cond_1_rep3cond_2_rep1cond_2_rep2cond_2_rep3cond_0_rep1cond_0_rep2cond_0_rep3cond_3_rep3cond_4_rep3cond_3_rep2cond_4_rep2cond_5_rep3cond_6_rep3cond_5_rep2cond_6_rep2cond_5_rep1cond_6_rep1cond_3_rep1cond_4_rep1cond_24_rep1cond_12_rep2cond_24_rep2cond_24_rep3cond_12_rep1cond_16_rep1cond_12_rep3cond_16_rep2cond_16_rep3

sample correlation matrix diffExpr.P0.001_C2.matrix.log2

0.5 0.7 0.9Value

Color Key

2 4 6 8 10 12

010

000

2000

030

000

4000

0

Number of Clusters

With

in C

lust

er S

um o

f Squ

ares

110

109

Figure 5 . Clustering of expression over time. a) Heat map displaying differentially expressed

genes. Expression levels are plotted in log2, space and mean centred (FDR of < 0.001) across

the entire time course. k-means clustering has partitioned genes into 7 clusters, as indicated

by coloured bars and numbered graphs below the heat map. b) Graphs displaying cluster

expression over time (0 to 24 h). c) Table displaying categories enriched (hypergeometric test,

corrected P value of < 0.05), indicated in red, for clusters 1 to 7.

T24Rep3T24Rep2T24Rep1T16Rep3T16Rep2T16Rep1

T12Rep3T12Rep2

T12Rep1T6Rep3T6Rep2T6Rep1T5Rep3T5Rep2T5Rep1T4Rep3T4Rep2T4Rep1T3Rep3T3Rep2T3Rep1T2Rep3T2Rep2T2Rep1

T1Rep3T1Rep2T1Rep1

T0Rep3

T0Rep2T0Rep1

Catego

ry

Ion

Tran

spor

t

ATPa

seA

ctiv

ity

Cyto

skel

eton

&A

ctin

Regu

latio

n

Loca

lizat

ion

Prot

ein

Met

abol

ism,F

oldi

ng

and

Mod

ifica

tions

Sarc

ogly

can&D

ystr

ogly

can

com

plex

Kina

sea

ctiv

ity

Gly

cero

neki

nasea

ctiv

ity

Hydr

olas

eac

tivity

Tran

sfer

ase

activ

ity

Tran

spos

ase

activ

ity

Oxi

dore

duct

ase

activ

ity

Pyro

phos

phat

ase

activ

ity

Exod

eoxy

ribon

ucle

ase

Cofa

ctor&C

oenz

yme

met

abol

ism

Oth

erE

nzym

es

Pyrim

idin

eM

etab

olism

Sulp

hurM

etab

olism

Arom

aticC

ompo

und

Met

abol

ism

Nitr

ogen

Met

abol

ism

Ener

gyV

iaO

xida

tion

ofO

rgan

ic

Phos

phor

usM

etab

olism

Phos

phor

ylat

ion

Resp

iratio

n

ETC/M

itoch

ondr

ia

Stre

ssR

espo

nse

Tran

spor

tand

Sig

nalin

g

DNA/

Nuc

leot

ide

Met

abol

ism

Tran

scrip

tion

Regu

latio

n

Tran

slatio

n

REDO

X

Suga

rMet

abol

ism

CWC

ompo

nentS

ynth

esis

BBSo

me

Gen

erat

ion

ofP

recu

rsor

Met

abol

itesa

ndE

nerg

y

Pref

oldi

nCo

mpl

ex

Clat

hrin

-coa

ted

pit

Oth

er5467213

−50

5

subcluster_5_log2_medianCentered_fpkm.txt, 889 trans

cent

ered

log2

(fpkm

+1)

cond

_0_r

ep1

cond

_0_r

ep2

cond

_0_r

ep3

cond

_1_r

ep1

cond

_1_r

ep2

cond

_1_r

ep3

cond

_2_r

ep1

cond

_2_r

ep2

cond

_2_r

ep3

cond

_3_r

ep1

cond

_3_r

ep2

cond

_3_r

ep3

cond

_4_r

ep1

cond

_4_r

ep2

cond

_4_r

ep3

cond

_5_r

ep1

cond

_5_r

ep2

cond

_5_r

ep3

cond

_6_r

ep1

cond

_6_r

ep2

cond

_6_r

ep3

cond

_12_

rep1

cond

_12_

rep2

cond

_12_

rep3

cond

_16_

rep1

cond

_16_

rep2

cond

_16_

rep3

cond

_24_

rep1

cond

_24_

rep2

cond

_24_

rep3

● ● ●

● ●● ● ●

●●

●

● ●●

● ● ●

●●

●●

●●

● ●● ●

●● ●

5

−50

5


cent

ered

log2

(fpkm

+1)

cond

_0_r

ep1

cond

_0_r

ep2

cond

_0_r

ep3

cond

_1_r

ep1

cond

_1_r

ep2

cond

_1_r

ep3

cond

_2_r

ep1

cond

_2_r

ep2

cond

_2_r

ep3

cond

_3_r

ep1

cond

_3_r

ep2

cond

_3_r

ep3

cond

_4_r

ep1

cond

_4_r

ep2

cond

_4_r

ep3

cond

_5_r

ep1

cond

_5_r

ep2

cond

_5_r

ep3

cond

_6_r

ep1

cond

_6_r

ep2

cond

_6_r

ep3

cond

_12_

rep1

cond

_12_

rep2

cond

_12_

rep3

cond

_16_

rep1

cond

_16_

rep2

cond

_16_

rep3

cond

_24_

rep1

cond

_24_

rep2

cond

_24_

rep3

●

● ●●

●●

●

●

●

●

●

●

●

●

●

●●

●● ● ●

●●

●●

● ●

●

●●

4

−6−4

−20

24

6


cent

ered

log2

(fpkm

+1)

cond

_0_r

ep1

cond

_0_r

ep2

cond

_0_r

ep3

cond

_1_r

ep1

cond

_1_r

ep2

cond

_1_r

ep3

cond

_2_r

ep1

cond

_2_r

ep2

cond

_2_r

ep3

cond

_3_r

ep1

cond

_3_r

ep2

cond

_3_r

ep3

cond

_4_r

ep1

cond

_4_r

ep2

cond

_4_r

ep3

cond

_5_r

ep1

cond

_5_r

ep2

cond

_5_r

ep3

cond

_6_r

ep1

cond

_6_r

ep2

cond

_6_r

ep3

cond

_12_

rep1

cond

_12_

rep2

cond

_12_

rep3

cond

_16_

rep1

cond

_16_

rep2

cond

_16_

rep3

cond

_24_

rep1

cond

_24_

rep2

cond

_24_

rep3

●

● ●

●●

●

●●

●

● ●●

● ● ● ● ● ● ●●

●●

● ●●

● ●

●

●●

6

−50

510


cent

ered

log2

(fpkm

+1)

cond

_0_r

ep1

cond

_0_r

ep2

cond

_0_r

ep3

cond

_1_r

ep1

cond

_1_r

ep2

cond

_1_r

ep3

cond

_2_r

ep1

cond

_2_r

ep2

cond

_2_r

ep3

cond

_3_r

ep1

cond

_3_r

ep2

cond

_3_r

ep3

cond

_4_r

ep1

cond

_4_r

ep2

cond

_4_r

ep3

cond

_5_r

ep1

cond

_5_r

ep2

cond

_5_r

ep3

cond

_6_r

ep1

cond

_6_r

ep2

cond

_6_r

ep3

cond

_12_

rep1

cond

_12_

rep2

cond

_12_

rep3

cond

_16_

rep1

cond

_16_

rep2

cond

_16_

rep3

cond

_24_

rep1

cond

_24_

rep2

cond

_24_

rep3

●

● ●

●

● ● ●

● ●

●

●

●

●

●

●

●

●

●

●

●●

●

●●

●

● ●

●

● ●

7

−50

510


cent

ered

log2

(fpkm

+1)

cond

_0_r

ep1

cond

_0_r

ep2

cond

_0_r

ep3

cond

_1_r

ep1

cond

_1_r

ep2

cond

_1_r

ep3

cond

_2_r

ep1

cond

_2_r

ep2

cond

_2_r

ep3

cond

_3_r

ep1

cond

_3_r

ep2

cond

_3_r

ep3

cond

_4_r

ep1

cond

_4_r

ep2

cond

_4_r

ep3

cond

_5_r

ep1

cond

_5_r

ep2

cond

_5_r

ep3

cond

_6_r

ep1

cond

_6_r

ep2

cond

_6_r

ep3

cond

_12_

rep1

cond

_12_

rep2

cond

_12_

rep3

cond

_16_

rep1

cond

_16_

rep2

cond

_16_

rep3

cond

_24_

rep1

cond

_24_

rep2

cond

_24_

rep3

●● ●

●● ●

● ●● ●

●● ●

●

● ●

●

● ●●

●

●

●

● ●● ●

●

●●

2

−6−4

−20

24

6


cent

ered

log2

(fpkm

+1)

cond

_0_r

ep1

cond

_0_r

ep2

cond

_0_r

ep3

cond

_1_r

ep1

cond

_1_r

ep2

cond

_1_r

ep3

cond

_2_r

ep1

cond

_2_r

ep2

cond

_2_r

ep3

cond

_3_r

ep1

cond

_3_r

ep2

cond

_3_r

ep3

cond

_4_r

ep1

cond

_4_r

ep2

cond

_4_r

ep3

cond

_5_r

ep1

cond

_5_r

ep2

cond

_5_r

ep3

cond

_6_r

ep1

cond

_6_r

ep2

cond

_6_r

ep3

cond

_12_

rep1

cond

_12_

rep2

cond

_12_

rep3

cond

_16_

rep1

cond

_16_

rep2

cond

_16_

rep3

cond

_24_

rep1

cond

_24_

rep2

cond

_24_

rep3

●

●●

● ● ●●

●●

●

●●

●

●

●●

●

● ●●

●

●●

●●

●●

●

●

●

1

−6−4

−20

24

68


cent

ered

log2

(fpkm

+1)

cond

_0_r

ep1

cond

_0_r

ep2

cond

_0_r

ep3

cond

_1_r

ep1

cond

_1_r

ep2

cond

_1_r

ep3

cond

_2_r

ep1

cond

_2_r

ep2

cond

_2_r

ep3

cond

_3_r

ep1

cond

_3_r

ep2

cond

_3_r

ep3

cond

_4_r

ep1

cond

_4_r

ep2

cond

_4_r

ep3

cond

_5_r

ep1

cond

_5_r

ep2

cond

_5_r

ep3

cond

_6_r

ep1

cond

_6_r

ep2

cond

_6_r

ep3

cond

_12_

rep1

cond

_12_

rep2

cond

_12_

rep3

cond

_16_

rep1

cond

_16_

rep2

cond

_16_

rep3

cond

_24_

rep1

cond

_24_

rep2

cond

_24_

rep3

●● ●

●

●●

●

●

●

●

●●

●

●●

●●

●

●●

●●

●

● ● ● ●● ● ●

3

54 6 721 3

ColorKey

-10-50510

CenteredLog2FoldChange(FDR<0.001)

A

B

C

110

Ungerminated spores have a radically different expression profile from germinated spores

(6,456 significantly differentially expressed genes; false-discovery rate [FDR] of < 0.001): this

is reflected by the functions of transcripts enriched in ungerminated spores. By pairwise

comparisons of differentially expressed genes between time points, the largest

transcriptional changes were seen during the first hour of germination (3,476 genes

upregulated and 2,573 genes downregulated [Figure 6a]). The large quantity of apparently

down regulated transcripts may in fact represent transcripts which have been degraded, or

immediately utilised upon germination initiation. Following this, there was a period of

transcriptional consistency over the course of isotropic swelling, where few or no genes

were found differentially expressed (Figure 6a). A noticeable shift in differential

expression then bridges the beginning and later stages of hyphal growth (6 to 12 h

[Figure 6a]). At the beginning of germination, an increase is observed in expression of

transcripts with predicted roles in stress response, mitochondrial ribonucleases (MRP),

the prefoldin complexes, organophosphate and sulfur metabolism, and

transposase, ATPase, nucleoside triphosphatase, and glycerone kinase activities (Figure

6b). A decrease in expression of genes with predicted functions in the organization of

the actin cytoskeleton, carbohydrate metabolism, translation initiation factors,

hexon binding, and phosphodiesterase, arylformamidase, galactosylceramidase, and

precorrin-2 dehydrogenase activities is also seen (Figure 6b). Notably, some categories are

both positively and negatively regulated at the beginning of germination: transcripts

predicted to have roles in ion channel activity and hydrolase and pyrophosphatase

activities do not always trend together (Figure 6b). It is likely these processes may involve

several regulatory mechanisms implicated in initializing germination.

After initiation (1 to 2 h), there is an overall trend of downregulation. The majority of

transcripts that were upregulated at 1 h are downregulated at 2 h (Figure 6b), suggesting a

111

reorganization of the transcriptome upon germination initiation. Notably, metabolism of

sulfur, organophosphate, and thiamine diphosphate remains downregulated at both 2 and 3

h. After the transcriptional stability during isotropic growth and hyphal emergence,

transcripts with predicted roles in stress response, respiration, ATPase and nucleoside

triphosphatase activities, and redox increase during early hyphal growth (Figure 6b). Between

6 and 12 h, the proportion of downregulated transcripts decreases, with hydrolase and

pyrophosphatase activities appearing both up and downregulated.

112

Figure 6. Differential gene expression over time. a) The number of genes significantly differentially expressed (multiple comparisons corrected

P value of < 0.05, corrected via Benjamini-Hochberg method) between time points, shown over time. Green bars indicate genes with an

increase in expression (log fold change [FC] of > 2), while red bars indicate genes with a decrease in expression (log FC of < -2). b) Enriched

categories for the up or downregulated genes over time. Green boxes indicate an overall upregulation of this category, red

indicates an overall downregulation and red-green hatching indicates mixed regulation of this category.

0−11−2

2−33−4

4−55−6

6−1212−16

16−24Tim

e

Number of Genes

−3000 −2000 −1000 0 1000 2000 3000 4000

3476

1951

00

0

868

20164

−2573

−831

−21−3

00

−256

−2

−235

A

B

Germ

inationInitiationIsotropicSw

elling&

Germ

TubeEm

ergence

HyphalG

rowth

NumberofGenes

3476

10

00

888

20164

195

00

2573

831

213

2562

235

LogFC<-2,FDR

<0.05

LogFC>2,FDR

<0.05

Time

ion channel activity

dystroglycan complex

sarcoglycan complex

dystrophin-associated glycoprotein complex

hydrolase & pyrophosphatase

prefoldin complex

transposase activity

ATPase activity

nucleoside-triphosphatase activity

sulfur metabolism

organophosphate biosynthetic process

thiamine diphosphate metabolism

response to stress

cellular respiration

oxidation-reduction process

energy derivation by oxidation of organic compounds

localization & transport

glycerone kinase activity

0-1

1-2

2-3

6-12

16-24

0−1 1−2 2−3 3−4 4−5 5−6 6−12 12−16 16−24Time

Num

ber o

f Gen

es

−300

0−2

000

−100

00

1000

2000

3000

4000

3476

1951 0 0 0

868

20164

−2573

−831

−21 −3 0 0

−256

−2

−235

A

B

GerminationInitiation

IsotropicSwelling&GermTubeEmergence

HyphalGrowth

Num

bero

fGen

es

3476

1 0 0 0

888

20164195

0 0

2573

831

21 3256

2235

LogFC <-2,FDR<0.05

LogFC >2,FDR<0.05

Tim

e

ion

chan

nelac

tivi

ty

dys

trogly

can

com

ple

x

sarc

ogly

can

com

ple

x

dys

trophi

n-as

soci

ated

gly

copro

tein

com

ple

x

hydro

lase

&pyr

opho

spha

tase

pre

fold

in c

om

ple

x

tran

sposa

seac

tivi

ty

ATP

ase

activi

ty

nucl

eoside-

trip

hosp

hata

seac

tivi

ty

sulfu

rm

etab

olis

m

org

anopho

spha

tebio

synt

hetic

pro

cess

thia

min

edip

hosp

hate

met

abolis

m

resp

ons

e to

stres

s

cellu

lar

resp

irat

ion

oxi

dat

ion-

reduc

tion

pro

cess

ener

gy

der

ivat

ion

by

oxi

dat

ion

oforg

anic

com

poun

ds

loca

lizat

ion

&tran

sport

gly

cero

neki

nase

activi

ty

0-1

1-2

2-3

6-12

16-24

B

113

Similar trends are observed when analysis of is carried out to determine the expression

of genes with predicted functions (Pfam) in carbohydrate metabolism (Figure 7a), inorganic

ion metabolism (Figure 7b), lipid metabolism (Figure 7c), amino acid metabolism (Figure 7d)

and signalling (Figure 7e). Resting spore expression appears most similar to post-

germination initiation expression. When carbohydrate metabolism is examined (Figure

7a) two subsets appear to gradually increase in expression over time,

demonstrating the sustained requirement for respiration as biomass increases. Resting

spores appear to express a subset of genes involved in inorganic ion metabolism (Figure 7b),

which appear lowly expressed post germination-initiation, whilst other subsets are stably

expressed throughout. Resting spores also express a subset of genes involved in lipid

metabolism (Figure 7c), whilst other subsets appear highly expressed only after

germination is initiated. This demonstrates the potential reliance of resting spore on

stored lipids to initiate and sustain germination. Expression of genes with predicted

roles in amino acid metabolism appears relatively stable over germination (Figure

7d), whilst other small subsets appear highly expressed within resting spores (0h), and

again in filamentous form (12-24h). A slight increase in expression can also be noted at the

onset of germination (1h), indicating spores rely on protein synthesis to kick-start

germination and biomass production, as expected. Expression of genes with predicted

functions in signalling show 3 distinct trends (Figure 7e): One subset appears highly

expressed in resting spores (0h), a second subset is highly expressed at the onset of

germination and throughout swelling(1-6h) and a third is highly expressed within

filamentous forms (12-24h). These subsets correspond with the phenotypic stages

outlined for germination of these spores, and demonstrate the reliance on unique

signalling pathways to initiate and maintain these phenotypic stages.

Metabolic Activity over Germination

114

A

B

cond_0_rep1

cond_0_rep2

cond_0_rep3

cond_1_rep1

cond_1_rep2

cond_1_rep3

cond_2_rep1

cond_2_rep2

cond_2_rep3

cond_3_rep1

cond_3_rep2

cond_3_rep3

cond_4_rep1

cond_4_rep2

cond_4_rep3

cond_5_rep1

cond_5_rep2

cond_5_rep3

cond_6_rep1

cond_6_rep2

cond_6_rep3

cond_12_rep1

cond_12_rep2

cond_12_rep3

cond_16_rep1

cond_16_rep2

cond_16_rep3

cond_24_rep1

cond_24_rep2

cond_24_rep3

RO3G_008323RO3G_012185RO3G_001059RO3G_004115RO3G_000632RO3G_011127RO3G_004528RO3G_008260RO3G_014039RO3G_002362RO3G_008239RO3G_006092RO3G_004685RO3G_008251RO3G_001638RO3G_014633RO3G_004999RO3G_009004RO3G_016877RO3G_010968RO3G_016768RO3G_013162RO3G_012427RO3G_013624RO3G_014140RO3G_007730RO3G_005361RO3G_007853RO3G_013976RO3G_005729RO3G_008951RO3G_004751RO3G_016738RO3G_004921RO3G_005877RO3G_017335RO3G_007078RO3G_009715RO3G_008034RO3G_001942RO3G_002646RO3G_005964RO3G_015358RO3G_017108RO3G_008584RO3G_010045RO3G_002082RO3G_012639RO3G_003861RO3G_004078RO3G_001101RO3G_004220RO3G_010972RO3G_006347RO3G_013397RO3G_002878RO3G_017698RO3G_007012RO3G_001621RO3G_010931RO3G_008164RO3G_004044RO3G_007331RO3G_014894RO3G_006801RO3G_011425RO3G_012420RO3G_012419RO3G_000184RO3G_001635RO3G_013857RO3G_004050RO3G_006184RO3G_004425RO3G_008235RO3G_013623RO3G_010776RO3G_012402RO3G_012058RO3G_006644RO3G_006723RO3G_015767RO3G_004983RO3G_013713RO3G_005612RO3G_007534RO3G_013999RO3G_010040RO3G_002079RO3G_004077RO3G_011844RO3G_008302RO3G_009331RO3G_016651RO3G_017232RO3G_002460RO3G_013782RO3G_014473RO3G_009341RO3G_006226RO3G_004228RO3G_002098RO3G_005446RO3G_007868RO3G_002765RO3G_013845RO3G_015933RO3G_007811RO3G_001497RO3G_012210RO3G_015589RO3G_005668RO3G_013904RO3G_013412RO3G_008732RO3G_006954RO3G_005593RO3G_003325RO3G_016577RO3G_017362RO3G_008703RO3G_003470RO3G_008907RO3G_014733RO3G_013450RO3G_005022RO3G_002745RO3G_013990RO3G_002184RO3G_005854RO3G_002305RO3G_014443RO3G_009535RO3G_015186RO3G_003642RO3G_000355RO3G_003296RO3G_014472RO3G_014451RO3G_001373RO3G_015025RO3G_008847RO3G_014223RO3G_016455RO3G_015407RO3G_007401RO3G_003412RO3G_012581RO3G_010873RO3G_012763

0

5

10

15

cond_0_rep1

cond_0_rep2

cond_0_rep3

cond_1_rep1

cond_1_rep2

cond_1_rep3

cond_2_rep1

cond_2_rep2

cond_2_rep3

cond_3_rep1

cond_3_rep2

cond_3_rep3

cond_4_rep1

cond_4_rep2

cond_4_rep3

cond_5_rep1

cond_5_rep2

cond_5_rep3

cond_6_rep1

cond_6_rep2

cond_6_rep3

cond_12_rep1

cond_12_rep2

cond_12_rep3

cond_16_rep1

cond_16_rep2

cond_16_rep3

cond_24_rep1

cond_24_rep2

cond_24_rep3

RO3G_009004RO3G_012073RO3G_014633RO3G_001166RO3G_009943RO3G_002989RO3G_012036RO3G_012618RO3G_001942RO3G_008323RO3G_009608RO3G_006082RO3G_012413RO3G_005845RO3G_007727RO3G_002370RO3G_005797RO3G_005023RO3G_010987RO3G_009644RO3G_002905RO3G_017452RO3G_005055RO3G_005319RO3G_004915RO3G_010605RO3G_009715RO3G_007605RO3G_011964RO3G_001303RO3G_015117RO3G_000243RO3G_006639RO3G_010455RO3G_006640RO3G_006147RO3G_007732RO3G_014055RO3G_014118RO3G_011762RO3G_008718RO3G_007953RO3G_005090RO3G_012321RO3G_017837RO3G_005152RO3G_011152RO3G_001114RO3G_016619RO3G_006312RO3G_017038RO3G_016064RO3G_003227RO3G_001339RO3G_007143RO3G_009336RO3G_007591RO3G_014221RO3G_007959RO3G_012220RO3G_003176RO3G_014024RO3G_015783RO3G_005988RO3G_001553RO3G_012410RO3G_012281RO3G_016289RO3G_011710RO3G_002312RO3G_014368RO3G_011347RO3G_017800RO3G_009663RO3G_003379RO3G_006723RO3G_009245RO3G_010477RO3G_013921RO3G_016843RO3G_006368RO3G_009246RO3G_015256RO3G_007775RO3G_008588RO3G_010688RO3G_005612

0

5

10

15

116

115

C

D

cond_0_rep1

cond_0_rep2

cond_0_rep3

cond_1_rep1

cond_1_rep2

cond_1_rep3

cond_2_rep1

cond_2_rep2

cond_2_rep3

cond_3_rep1

cond_3_rep2

cond_3_rep3

cond_4_rep1

cond_4_rep2

cond_4_rep3

cond_5_rep1

cond_5_rep2

cond_5_rep3

cond_6_rep1

cond_6_rep2

cond_6_rep3

cond_12_rep1

cond_12_rep2

cond_12_rep3

cond_16_rep1

cond_16_rep2

cond_16_rep3

cond_24_rep1

cond_24_rep2

cond_24_rep3

RO3G_003904RO3G_007535RO3G_007998RO3G_015853RO3G_016448RO3G_003874RO3G_014067RO3G_008958RO3G_015754RO3G_015627RO3G_001549RO3G_015348RO3G_016315RO3G_008791RO3G_012132RO3G_004127RO3G_010246RO3G_015164RO3G_007979RO3G_010030RO3G_004402RO3G_012829RO3G_003224RO3G_009527RO3G_008510RO3G_008509RO3G_010431RO3G_010223RO3G_008234RO3G_008099RO3G_005919RO3G_017062RO3G_003905RO3G_014387RO3G_012652RO3G_008488RO3G_014326RO3G_011635RO3G_008622RO3G_003469RO3G_013001RO3G_015575RO3G_016681RO3G_011822RO3G_015320RO3G_008710RO3G_009620RO3G_009086RO3G_015330RO3G_000546RO3G_017340RO3G_001223RO3G_001705RO3G_012062RO3G_011722RO3G_010276RO3G_010483RO3G_007119RO3G_000706RO3G_013088RO3G_009533RO3G_006161RO3G_001493RO3G_015564RO3G_011743RO3G_003457RO3G_008635RO3G_015669RO3G_004225RO3G_014735

0

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4

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8

10

12

cond_0_rep1

cond_0_rep2

cond_0_rep3

cond_1_rep1

cond_1_rep2

cond_1_rep3

cond_2_rep1

cond_2_rep2

cond_2_rep3

cond_3_rep1

cond_3_rep2

cond_3_rep3

cond_4_rep1

cond_4_rep2

cond_4_rep3

cond_5_rep1

cond_5_rep2

cond_5_rep3

cond_6_rep1

cond_6_rep2

cond_6_rep3

cond_12_rep1

cond_12_rep2

cond_12_rep3

cond_16_rep1

cond_16_rep2

cond_16_rep3

cond_24_rep1

cond_24_rep2

cond_24_rep3

RO3G_003025RO3G_016154RO3G_012545RO3G_008259RO3G_005612RO3G_006189RO3G_008584RO3G_007010RO3G_012989RO3G_007502RO3G_005368RO3G_002723RO3G_006723RO3G_003542RO3G_010906RO3G_009146RO3G_015687RO3G_017286RO3G_006890RO3G_005112RO3G_010844RO3G_004802RO3G_011418RO3G_016366RO3G_012700RO3G_009159RO3G_013994RO3G_011714RO3G_008151RO3G_013710RO3G_003036RO3G_001695RO3G_009237RO3G_001280RO3G_013434RO3G_006615RO3G_007665RO3G_005383RO3G_002471RO3G_011847RO3G_005901RO3G_005301RO3G_003642RO3G_015339RO3G_007591RO3G_007244RO3G_006081RO3G_011196RO3G_000697RO3G_013969RO3G_012926RO3G_016118RO3G_007651RO3G_007708RO3G_014305RO3G_010418RO3G_000945RO3G_017795RO3G_013468RO3G_007218RO3G_012520RO3G_009730RO3G_002537RO3G_002355RO3G_006653RO3G_000148RO3G_006147RO3G_008727RO3G_006006RO3G_012978RO3G_002307RO3G_008848RO3G_015491RO3G_011172RO3G_004575RO3G_011660RO3G_009223RO3G_002715RO3G_010704RO3G_017438RO3G_017437RO3G_013738RO3G_003714RO3G_013750RO3G_001678RO3G_011793RO3G_016642RO3G_011303RO3G_017134RO3G_003231RO3G_006094RO3G_008323RO3G_016233RO3G_016753RO3G_014633RO3G_009004RO3G_010244RO3G_014646RO3G_015786RO3G_010673RO3G_009202RO3G_005927RO3G_015749RO3G_005770RO3G_006314RO3G_014414RO3G_015076RO3G_017764RO3G_004502RO3G_006897RO3G_009855RO3G_001166RO3G_014468RO3G_017770RO3G_002446RO3G_012145RO3G_005601RO3G_016127RO3G_009512RO3G_008578RO3G_006400RO3G_013976RO3G_004233RO3G_003929RO3G_007052RO3G_008747RO3G_009125RO3G_012611RO3G_007256RO3G_001942RO3G_008413RO3G_014770RO3G_005214RO3G_009715RO3G_000961RO3G_001157RO3G_010059RO3G_012647RO3G_011773RO3G_004872RO3G_007427

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E

Figure 7. Heatmaps displaying expression of metabolic processes over germination (t =

0,1,2,3,4,5,6,12,16 and 24 h, n=3). a) Expression of genes with Pfam annotations involved in

carbohydrate metabolism (expression = plotted in log2, FDR of < 0.001). b) Expression of

genes with Pfam annotations involved in inorganic ion metabolism (expression = plotted in

log2, FDR of < 0.001). c) Expression of genes with Pfam annotations involved in lipid

metabolism (expression = plotted in log2, FDR of < 0.001). d) Expression of genes with Pfam

annotations involved in amino acid metabolism (expression = plotted in log2, FDR of < 0.001).

e) Expression of genes with Pfam annotations involved in signalling (expression = plotted in

log2, FDR of < 0.001).

cond_0_rep1

cond_0_rep2

cond_0_rep3

cond_1_rep1

cond_1_rep2

cond_1_rep3

cond_2_rep1

cond_2_rep2

cond_2_rep3

cond_3_rep1

cond_3_rep2

cond_3_rep3

cond_4_rep1

cond_4_rep2

cond_4_rep3

cond_5_rep1

cond_5_rep2

cond_5_rep3

cond_6_rep1

cond_6_rep2

cond_6_rep3

cond_12_rep1

cond_12_rep2

cond_12_rep3

cond_16_rep1

cond_16_rep2

cond_16_rep3

cond_24_rep1

cond_24_rep2

cond_24_rep3

RO3G_001791RO3G_005082RO3G_016911RO3G_005924RO3G_016794RO3G_005438RO3G_008363RO3G_002202RO3G_009540RO3G_002670RO3G_014880RO3G_007083RO3G_007504RO3G_006808RO3G_013513RO3G_004543RO3G_001092RO3G_015565RO3G_011246RO3G_005397RO3G_006305RO3G_012030RO3G_005323RO3G_010512RO3G_017849RO3G_014693RO3G_011467RO3G_011154RO3G_013506RO3G_006869RO3G_000707RO3G_012238RO3G_015027RO3G_013534RO3G_013289RO3G_000183RO3G_004107RO3G_015149RO3G_012757RO3G_010484RO3G_017261RO3G_008039RO3G_004553RO3G_013928RO3G_002570RO3G_012088RO3G_007702RO3G_003444RO3G_003134RO3G_012572RO3G_011731RO3G_015102RO3G_010064RO3G_006588RO3G_009655RO3G_017057RO3G_013264RO3G_005387RO3G_014669RO3G_012487RO3G_010611RO3G_015596RO3G_016808RO3G_015293RO3G_008604RO3G_001009RO3G_003181RO3G_011953RO3G_013852RO3G_008490RO3G_016702RO3G_015881RO3G_011143RO3G_013148RO3G_016691RO3G_008406RO3G_017278RO3G_012450RO3G_005401RO3G_000963RO3G_008358RO3G_011490RO3G_008466RO3G_009751RO3G_014005RO3G_010306RO3G_003436RO3G_006894RO3G_016098RO3G_012120RO3G_000952RO3G_016699RO3G_009229RO3G_003564RO3G_002669RO3G_009158RO3G_007287RO3G_000671RO3G_003647RO3G_003316RO3G_000710RO3G_016178RO3G_005062RO3G_004039RO3G_000886RO3G_005972RO3G_008594RO3G_015286RO3G_009893RO3G_000722RO3G_008227RO3G_013067RO3G_016909RO3G_017159RO3G_010840RO3G_011683RO3G_015987RO3G_009091RO3G_013742RO3G_000266RO3G_015740RO3G_015060RO3G_017712RO3G_003713RO3G_014470RO3G_006886RO3G_005190RO3G_016644RO3G_005096RO3G_005879RO3G_012180RO3G_012037RO3G_002533RO3G_014030RO3G_010281RO3G_015753RO3G_014380RO3G_013277RO3G_012322RO3G_014354RO3G_016284RO3G_012079RO3G_001466RO3G_009279RO3G_016488RO3G_004933RO3G_016891RO3G_014170RO3G_007327RO3G_013802RO3G_016029RO3G_011926RO3G_017309RO3G_005744RO3G_011301RO3G_013262RO3G_000526RO3G_009434RO3G_009519RO3G_003313RO3G_007655RO3G_009296RO3G_013481RO3G_013906RO3G_015300RO3G_011797RO3G_001004RO3G_005469RO3G_012233RO3G_010915RO3G_013003RO3G_001332RO3G_007652RO3G_013894RO3G_010659RO3G_010980RO3G_005212RO3G_001952RO3G_000839RO3G_011155RO3G_017167RO3G_004732RO3G_011800RO3G_006166RO3G_014672

0

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12

14

117

Pathways Upregulated at Alternate Germination Phases

PathwayTools annotation of the R. delemar genome allows analyses of individual pathway

regulation over the course of germination. There are currently only 4 fungal genomes (S.

cerevisiae, C. albicans, E. dermatitidis and P. rubens, available at: https://biocyc.org/organism-

summary?object=CALBI) publicly available on biocyc, which have annotated PGDB’s

(PathoLogic Databases: format compatible with PathwayTools). This annotation is the first

available (https://github.com/psephtonclark/rhior3cyc) for a Mucorales species.

Pathways which appear highly regulated during discrete germination phases (Figure 8) will be

described here. The following pathways were found to be upregulated at resting (0h) and

during hyphal growth (12-24h): protein glycosylation, chitin biosynthesis, trehalose

degradation, ribonucleotide biosynthesis, glycolysis and galactose degradation. This is

consistent with other findings which show chitin biosynthesis to be important for hyphal

emergence and extension in A. nidulans (Yamazaki et al. 2008), protein turnover to be a

hallmark of filamentous vegetative growth (Sun et al. 2017; Anderson et al. 2016) and

respiration to be important for maintaining fungal biomass (Prasad, Kurup, and Maheshwari

1979). It should be noted that glycolysis also appears down regulated at 0-1 hours,

indicating complex regulation of this process may be required to maintain dormancy

and initiate germination. Galactose degradation appears downregulated throughout

swelling (1-6h), highlighting its importance for initiation and hyphal growth.

Within resting spores (0h), hypusine and glyoxylate pathways are upregulated and NADP

mitochondrial/cytosolic conversion appears to increase, whilst spermidine pathways also

appear upregulated in both resting and initial spores (0-1h). Similarly, cysteine and glutamine

118

pathways are also upregulated at this time. Inositol degradation appears downregulated in

resting and initial spores (0-1h), indicating inositol may be important at the onset of

germination, whilst phyate degradation appears upregulated within resting spores (0h),

indicating a role in dormancy maintenance. Xyoglucan and chitin degradation appear

downregulated in resting spores (0h), along with peroxisome processes. This is consistent

with conidial A. niger, which upregulates transcripts involved in amino acid metabolism and

glyoxylate pathways, and downregulates peroxisome processes (Novodvorska et al. 2013).

At germination initiation (1h), Fe-S cluster biosynthesis appears downregulated, whilst

phyate degradation is upregulated. Within swelling spores (3-6h), cysteine and glutamine

catabolic and metabolic pathways appear upregulated, whilst NADP conversion, Cytochrome C,

ATPase and NADPH oxidoreductase activities appear downregulated. This is consistent

with A. niger germlings, which show upregulation of metabolic processes including

amino acid processing (van Leeuwen et al. 2013). Within hyphal forms (12-24h), Fe-S

cluster biosynthesis, tetrahydrofolate biosynthesis, oxoglutarate and isovalerate

decarboxylation, Acetyl CoA metabolism, glycolysis, ATPase and peroxisome activity appear

upregulated, indicating a reliance on aerobic respiration for hyphal growth. This is

consistent with findings which show aerobic respiration to be important for the

hyphal growth of many fungal species (Seto and Tazaki 1975; Lew and Levina 2004;

Solaiman and Saito 1997; Watanabe et al. 2006).

119

120

119

121

Up at Hyphal (12-24) Down at Resting and Initial (0-1): Fe-S Cluster Biosynthesis

Up at Resting(0) and Hyphal (12-24): Protein Glycosylation, Chitin Biosynthesis and Trehalose Degradation

Up at Resting and Hyphal (0, 12-24) Down at Initial and Mid (1-6): Ribonucleotide Biosynthesis

Up at Resting (0): Hypusine Biosynthesis- AA only found in EIF5A, this interacts with Spermidine

Up at Resting and Initial (0-1): Spermidine Biosynthesis- involved in signal transduction and stress response

Up at Hyphal (12-24) Down at Resting & Initial (0-1): Inisitol Pi Biosynthesis and Degradation

122

Up at Resting and Initial (0-1), Down at Mid (3-6): Cysteine and Glutamine Pathways

Up at Hyphal (12- 24) and Down atResting & Initial (0- 1):TetrahydorfolateBiosynthesis

Up at Resting (0) and Down at Mid (3-6): NADP Mitochondrial/Cytosolic Conversion

Up at Resting (0): Glyoxylate Pathway

Glycolysis 1 & 2: Up at Resting and Hyphal (0, 12-24), Down at Restingand Initial (0-1)

123

• Down at Mid (3-6): Cytochrome C, ATPase and NADPH Oxidoreductase• Up at Hyphal (12-24): CoA Ligase• Up at Hyphal (12-24): ATPase• Up at Resting (0) and Down Mid (3-6): Myrosinase Production• Down at Resting (0): Monoxygenase• Down at Initial (1) & Mid (3-6): Glucoronosyl transferase : UDP generation• Up at Hyphal (12-24), Down at Mid (3-6): Phosphatidylcholine transferase

Figure 8. Pathways differentially regulated over the course of germination. Differential

pathway expression was determined by highlighting pathways which included genes

significantly differentially expressed (multiple comparisons corrected P value of < 0.05)

between time points. Genes with increased expression (LogFC > 2) and decreased

expression (LogFC < -2) were selected for this analysis. Up and down regulated pathways

were highlighted using the custom R. delemar pathologic annotation and PathwayTools.

Up at Hyphal (12-24): Oxoglutarate and Isovalerate decarboxylation (CoA Regeneration)

Up at Hyphal (12-24): Acetyl CoA Ligase and Synthase

Down at Resting (0): Xyoglucan and Chitin Degradation

Up at Hyphal (12-24), Down at Resting and Mid (0, 3-6): Peroxisome

125

124

Co-transcriptional Networks

To determine whether phenotypes expressed a core set of genes, co-transcriptional network

analysis was performed. In total, resting spores and those germinated for up to two hours

shared expression of 4,738 transcripts. These transcripts were enriched for processes which

include cellular and primary metabolism, ribosome biogenesis, ncRNA processes, RNA

metabolism and protein metabolism (Figure 9). This core set may be key to initiating cellular

metabolism and protein processing which support the rapid morphological changes which

occur at germination initiation. Swelling spores (3-6h) co-expressed only 109 transcripts

(Figure 10), with roles in metabolism, RNA, tRNA and nucleotide processing and protein

processing. Though much smaller, this core set appears similar in function to the one

identified within 0-2h resting and swelling spores.

R. delemar in its hyphal form (12-24h) shares 1677 co-expressed transcripts. These had roles

in metabolism, tRNA, RNA and nucleotide processing, protein processing and macromolecule

processing (Figure 11). Again, the core set identified here appears highly similar in

functionality to the core sets for resting and swelling spores. This analysis suggests there is a

core set of transcripts expressed to maintain function of R. delemar. As all transcripts included

in this analysis were identified to be significantly differentially expressed across the entire

course of germination (and therefore not constituently expressed for the entirety of

germination), it may be possible that alternate genes with similar functions are expressed

throughout the germination of R. delemar. This mechanism would allow for regulation of

these processes alternately at different morphological stages.

125

Figure 9. Co-transcriptional network of genes (grey) and network enrichment visualisation

(yellow) expressed between 0 and 2 hours post germination. Yellow nodes represent

enriched predicted functions (GO term, P < 0.05), reduced to specific terms with ReviGO,

listed on the left.

Figure 10. Co-transcriptional network of genes (grey) and network enrichment visualisation

(yellow) expressed between 3 and 6 hours post germination. Yellow nodes represent

enriched predicted functions (GO term, P < 0.05), reduced to specific terms with ReviGO,

listed on the left.

109 Nodes

126

Figure 11. Co-transcriptional network of genes (grey) and network enrichment visualisation (yellow)

expressed between 12 and 24 hours post germination. Yellow nodes represent enriched

predicted functions (GO term, P < 0.05), reduced to specific terms with ReviGO, listed on the left.

As the genome of R. delemar is likely to have undergone a whole genome duplication event

(Ma et al. 2009), duplicate gene pairs were identified (Ma et al. 2009) and the expression

profiles were analysed to identify pairs which displayed alternate expression profiles over

the course of germination. As these duplicates have been maintained within the

genome, it was hypothesised that some duplicates may have diverged in function.

Evidence of divergence may be visible via alternate expression profiles of the

duplicates. In total 70 pairs, which were differentially expressed over the course of

germination to a significant level (FDR < 0.001), were identified to have alternate

expression profiles (LogFC between each gene within the pair > 2) (Figure 12). Alternate

expression profiles support the hypothesis that these duplicated genes may have diverged in

function or process regulation. Of these genes, pairs with the most highly divergent

expression patterns over the course of germination had the following predicted

functions: Glycosyltransferase, Nucleoporin, SMR domain, Ribosomal protein S2,

Protein Kinase, Metallopeptidase, Phosphatidyl inositol 4-phosphate-5-kinase and a

conserved fungal protein of unknown function (Figure 13).

127

Duplicated Gene Pair Expression

Functions of these potential growth regulators should be explored further, to determine

whether these processes would be good targets for germination or growth inhibition, in

order to treat mucormycosis.

Figure 12. Heatmap displaying expression difference (LogFC) between duplicated gene pairs

(gene pairs listed on the Y axis, e.g. RO3G_001560_014978 represents pair RO3G_001560

and RO3G_014978).

diff0

diff1

diff2

diff3

diff4

diff5

diff6

diff12

diff16

diff24

RO3G_006301_015116RO3G_014705_000951RO3G_000951_014705RO3G_017737_006514RO3G_017784_012598RO3G_014909_007680RO3G_007680_014909RO3G_017446_000109RO3G_009493_012416RO3G_012844_007003RO3G_006391_001129RO3G_012786_007040RO3G_007040_012786RO3G_006977_017424RO3G_010585_010456RO3G_013822_013030RO3G_009790_013838RO3G_001665_008073RO3G_008174_001773RO3G_008174_001774RO3G_015408_008666RO3G_012481_013838RO3G_003871_009078RO3G_009078_003871RO3G_016605_013358RO3G_016649_005359RO3G_005359_016649RO3G_004903_013838RO3G_004367_008116RO3G_008116_004367RO3G_017815_013358RO3G_004362_013358RO3G_017436_009503RO3G_009503_017436RO3G_005977_013358RO3G_006482_001164RO3G_017030_004822RO3G_007248_016364RO3G_010244_011660RO3G_011660_010244RO3G_007044_012784RO3G_007747_015051RO3G_010459_010581RO3G_010581_010459RO3G_004111_007644RO3G_013261_003133RO3G_017369_007141RO3G_013749_005788RO3G_017110_007141RO3G_011984_007284RO3G_007284_011984RO3G_001153_011416RO3G_008749_006130RO3G_008806_006144RO3G_009333_002461RO3G_016605_017816RO3G_010703_012071RO3G_005978_013358RO3G_016048_017253RO3G_017253_016048RO3G_013746_005787RO3G_005438_012037RO3G_012911_009671RO3G_009671_012911RO3G_010560_005303RO3G_004119_007656RO3G_015274_011234RO3G_005714_013783RO3G_014978_001560RO3G_001560_014978

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Best Hit: P. blakesleeanus

glycosyltransferase family 2 protein% Identity: 77%E Value: 8e-151

Best Hit: R. microsporus DUF1771-domain-containing protein

% Identity: 74%E Value: 5e-77

Best Hit: R. microsporus hypothetical protein (no

well characterised homologues available)


Best Hit: R. microsporus 40S ribosomal protein S0


Best Studied Hit: S. pombe 40S ribosomal protein S0B


Best Hit: R. microsporus kinase-like protein


Best Studied Hit: P. lutzii Pb01 serine/threonine-

protein kinase ppk8% Identity: 67%E Value: 5e-24

Best Hit: R. microsporus SAICAR synthase-like

protein% Identity: 80%

E Value: 0Best Studied Hit: A. flavus multicopy suppressor of

stt4 mutation% Identity: 66%E Value: 2e-49

Best Hit: 'Hypothetical Protein' conserved

across fungal species, but without any known

function.

Best Hit: R. microsporus proliferation-associated

protein 1% Identity: 84%

E Value: 0Best Studied Hit:

S.lignohabitans Map2p(Microtubule AssociatedProtein) (DNA Binding)


Figure 13. Expression profiles of individual gene pairs. The X axis corresponds to time post

germination initiation (0-24h), whilst the y axis corresponds to expression (LogFC). Best hits

determined with blastn.

Potential Roles of Plant and Fungal Hormones as Germination Regulators

Whilst the germination of human fungal pathogens may be triggered by nutritional or

host factors, plant hormones are also capable of regulating germination of fungal spores.

Auxins, sialic acid, gibberellic acids, abscisic acid, ethylene and jasmonic acid are all

known to be capable of regulating the germination of fungal spores (Chanclud and Morel

2016). For this reason the genome of R. delemar was analysed to find homologues of plant

and fungal hormone receptors and biosynthesis genes.

129

0 5 10 15 20 25 0 5 10 15 20 25

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Expression of these homologues over germination will be discussed here. bcABA

homologues (Izquierdo-Bueno et al. 2018) and genes predicted (GO) to play roles in

abscisic acid biosynthesis were identified (Figure 14)(Appendix bcABA: gene

homology trees). Of these, one gene (R03G_015440) shows

upregulation (LogFC>15, significantly differentially expressed) within resting spores,

followed by a decrease in expression upon germination initiation. Abscisic acid acts

on plant seeds and spores as a germination inhibitor (Schopfer et al. 1979; Moody et al.

2016). Some phytopathogenic fungi have also been shown to produce abscisic acid (Takino

et al. 2019; Izquierdo-Bueno et al. 2018), however it should be noted that R. delemar has

not been shown to produce abscisic acid. If R. delemar is capable of producing ABA, this

molecule may work in a similar way to maintain dormancy in resting spores

through germination inhibition. However, until R. delemar has been shown to produce

ABA, these results should be taken with caution, as fungal homologues displayed

lower query covers, and other required ABA biosynthesis machinery was found to be

lacking. Future work focusing on improving predictions of hormone biosynthesis

pathways within the R. delemar genome would greatly benefit the field.

Figure 14. Expression (LogFC) of bcABA1, 2 and 4 homologues over germination. RO3G_008564: GO prediction: abscisic acid homeostasis. No plant homologues detected through blastp. RO3G_016095: GO prediction: abscisic acid homeostasis. No plant homologues detected through blastp. RO3G_015440: blastp aligned to bcABA2 Botrytis cinerea with: E value: 0.009, % Identity: 92%. No plant homologues detected.RO3G_011172: blastp aligned to bcABA2 Botrytis cinerea with: E value: 0.039, % Identity: 82%. No plant homologues detected.RO3G_016699: blastp aligned to bcABA1 Botrytis cinerea with: E value: 0.029, % Identity: 85%. No plant homologues detected.RO3G_006513: blastp aligned to bcABA4 Botrytis cinerea with: E value: 0.017, % Identity: 84%. No plant homologues detected.RO3G_005203: GO prediction: abscisic acid metabolic process. No plant homologues detected through blastp

cond_0_rep1

cond_0_rep2

cond_0_rep3

cond_1_rep1

cond_1_rep2

cond_1_rep3

cond_2_rep1

cond_2_rep2

cond_2_rep3

cond_3_rep1

cond_3_rep2

cond_3_rep3

cond_4_rep1

cond_4_rep2

cond_4_rep3

cond_5_rep1

cond_5_rep2

cond_5_rep3

cond_6_rep1

cond_6_rep2

cond_6_rep3

cond_12_rep1

cond_12_rep2

cond_12_rep3

cond_16_rep1

cond_16_rep2

cond_16_rep3

cond_24_rep1

cond_24_rep2

cond_24_rep3

RO3G_008564

RO3G_016095

RO3G_015440

RO3G_011172

RO3G_016699

RO3G_006513

RO3G_005203

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DELLA proteins are responsible for germination inhibition in plants (Dill et al. 2001). When

gibberellins are released, they interact with the DELLA proteins to induce

conformational changes which decreases the repressive effect of the DELLA proteins, and

the inhibition is removed. Two DELLA homologues were identified in R. delemar (via

Vesper custom HMMER annotation)(Figure 15)(Appendix DELLA: gene homology

trees); of these, R03G_010461 appears dynamically expressed over germination. This

homologue appears highly expressed both within resting spores and those growing in a

hyphal state. It may be possible that these homologues interact in a similar fashion,

maintaining dormancy within resting spores and suppressing early germination cues in R.

delemar which has entered its vegetative growth phase. These predicted functions were

identified through the automated Vesper annotation pipeline (materials and

methods), however a reciprocal BLAST against the plant database does not identify DELLA

homology, highlighting annotation limitations. These results should therefore be taken with

caution until experimental proof of R. delemar DELLA-like activity can be provided.

Figure 15. Expression (LogFC) of DELLA homologues over germination. RO3G_010461 sequence homology to DELLA-like sequence identified through custom annotation, species unknown: E Value: 0.027, % Identity: 53%RO3G_003034 sequence homology to DELLA-like sequence identified through custom annotation, species unknown: E Value: 0.07, % Identity: 46%

cond_0_rep1

cond_0_rep2

cond_0_rep3

cond_1_rep1

cond_1_rep2

cond_1_rep3

cond_2_rep1

cond_2_rep2

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RO3G_010461

RO3G_003034

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Figure 16. Expression (LogFC) of GLP homologues over germination. (Appendix GLP: gene homology trees)

RO3G_016021 sequence homology to GLP1-like sequence identified through sequence identified through custom annotation, species unknown: E Value: 6e-04, % Identity: 29%. RO3G_013521: sequence homology to GLP4-like sequence identified through sequence identified through custom annotation, species unknown: E Value: 0.014, % Identity: 28%. RO3G_000756: sequence homology to GLP1-like sequence identified through sequence identified through custom annotation, species unknown: E Value: 2e-10, % Identity: 71%. RO3G_017339: sequence homology to GLP2-like sequence identified through sequence identified through custom annotation, species unknown: E Value: 0.01, % Identity: 32%. RO3G_000511: sequence homology to GLP4-like sequence identified through sequence identified through custom annotation, species unknown: E Value: 3e-12, % Identity: 32%. RO3G_003101: sequence homology to GLP1-like sequence identified through sequence identified through custom annotation, species unknown: E Value: 1e-05, % Identity: 30% These predicted functions were identified through the automated annotation pipeline (materials and methods), however a reciprocal BLAST against the plant database does not identify GLP homology. These results should therefore be taken with caution until experimental proof of R. delemar GLP-like activity can be provided.

Further bioinformatic studies with the putative R. delemar DELLA sequences such as

alignments, modelling on known structures and detailed phylogeny with plant- and fungal

protein families would confirm whether R. delemar has proteins that function similarly to

DELLAs.

Potential Regulators With Known Functions In The Fungal Kingdom

Other known regulators of fungal germination and reproduction include trisporic acid

and photoreceptors. Expression of genes predicted to have roles in these

processes will be described here. Multiple genes predicted to have roles in

4dehydroxymethyl-trisporate-dehydrogenase production (Figure 17a) have increased

expression in resting spores, whilst others exhibit upregulation at germination onset and

throughout hyphal growth (Figure 17b).

cond_0_rep1

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cond_24_rep3

RO3G_016021

RO3G_013521

RO3G_000756

RO3G_017339

RO3G_000511

RO3G_003101

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A

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RO3G_00333739%1e-56

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RO3G_00712938%7e-50

RO3G_01282238%3e-52

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C

Figure 17. a) Expression (LogFC) of genes predicted to have roles in 4dehydroxymethyl-

trisporate-dehydrogenase (homologues of 4dehydroxymethyl-trisporate-dehydrogenase

from Blakeslea trispora) production over germination. Percentage identity and E value are

shown below each homologue. b) Expression (LogFC) of genes predicted to have roles in

trisporic acid production over germination (homologues of carotene oxygenase in Blakeslea

trispora), percentage identity and E value are shown below each homologue. c) Expression

(LogFC) of A. nidulans FAR homologues over germination, percentage identity and E value

are shown below each homologue.

Light is sensed by fungi through photoreceptor proteins capable of sensing a range

of wavelengths at varying intensities. Fungal photoreceptors include the phytochromes,

known to sense red light in Aspergillus nidulans; the blue light sensitive white collar

(WC) complex, best studied in N. crassa; and the Opsins, shown to sense green light

in N. crassa (Idnurm and Heitman 2005b, 2005a). Homologues of genes known to encode

0 1 2 3 4 5 6 12 16 24

RO3G_00722527%4e-36

RO3G_01144628%4e-34

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cryptochromes WC-1 & WC-2 show dynamic expression over germination (Figure 18);

R03G_000967 and R03G_001009 appear highly expressed over hyphal growth, whilst

R03G_013578 is highly expressed in resting spores, and R03G_003097 highly expressed at

the onset of germination. This dynamic expression suggests the germination of R. delemar

may also be regulated by light sensing receptors, in a similar way to other ancient fungi.

Figure 18. Expression (LogFC) of photoreceptor homologues over germination. Homologues and species are listed, along with percentage identity and E values, below the gene names.

RdAQP1 and RdAQP2 are thought to be transmembrane domains which show high

homology to porins from other fungal families. It has been postulated that the porins are

regulated by a His residue which may be protonated dependent upon pH and therefore

regulates water uptake and swelling of spores, prior to hyphal emergence (Turgeman et al.

2016; Verma et al. 2014).

0 1 2 3 4 5 6 12 16 24

RO3G_000967Cryptochrome DASH (N. crassa) 34%3e-66

RO3G_001009wc-1(N. crassa) 40%3e-146

RO3G_003277wc-1(N. crassa)37%3e-132

RO3G_014892wc-2(N. crassa)27%2e-28

RO3G_013578wc-2(N. crassa)25%3e-23

RO3G_003097wc-2(N. crassa)28%2e-26

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We see that both porins also appear dynamically regulated over germination (Figure 19),

concordant with swelling phases, thus supporting their proposed mechanism of

regulation.

Figure 19. Expression (CPM) of RO3G_001381 and RO3G_001102 (RdAQP1&2) over

germination.

0 1 2 3 4 5 6 12 16 24

RO3G_001381RO3G_001102

Expression of RO3G_001381 and RO3G_001102 (RdAQP1&2)

Time

CPM

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Comparisons of Transcription Throughout Germination

It is unclear whether the mechanisms that underpin germination are conserved throughout

the diverse fungal kingdom. To explore the extent of conservation, I compared my

transcriptional data set to other available transcriptional data sets for Aspergillus niger,

generated by Van Leeuwen et al and Novodvorska et al (van Leeuwen et al. 2013;

Novodvorska et al. 2013). When expression profiles of homologous genes from A. niger and

R. delemar are compared over the course of germination, genes with common or unique

functions specific to that time point can be identified. The largest shift in the transcriptional

landscape of A. niger can be seen at the initial stage of germination; we also observed this

shift in R. delemar. Transcripts with predicted functions involved in transport and localization,

proteolysis, and glucose, hexose, and carbohydrate metabolism increase at the initial stages

of germination in both A. niger and R. delemar, while transcripts with predicted functions in

translation, tRNA and rRNA processing, and amine carboxylic acid and organic acid

metabolism decrease (Figure 20). We also observe differences between the two data sets:

over isotropic and hyphal growth, homologous genes with predicted functions in valine and

branched-chain amino acid metabolism were upregulated only in R. delemar, while

homologous genes with predicted roles in noncoding RNA (ncRNA) metabolism, translation,

amino acid activation, and ribosome biogenesis were downregulated exclusively in R.

delemar. A 5% increase in genes that are uniquely up- or downregulated in R. delemar is found

in high-synteny regions of the genome, compared to genes that are up or downregulated in

both R. delemar and A. niger. The duplicated nature of the R. delemar genome may allow for

specific and tight regulation of the germination process, a feature unique to R. delemar.

137

It should be noted that A. niger and R. delemar were cultivated under conditions with

different media. Aspergillus complete medium (ACM), used to cultivate A. niger, and

sabouraud dextrose broth (SAB), used to cultivate R. delemar, both contain a complex mix of

salts, inorganic nutrients, and organic components. Peptides are provided in SAB by

mycological peptone, whereas peptides are provided by bacto peptone in ACM. The main

carbon source is the same for both ACM and SAB. Both media have a relatively low pH (ACM,

pH 6.5; SAB, pH 5.6), and it is known that pH is important for regulating germination in both

R. delemar and A. nidulans. There are currently limited studies that address differences in

gene expression, when germination is initiated in filamentous fungi, under different growth

media. Growth characteristics of A. nidulans have been shown to vary when contents of

media differ, while various growth cultivation methods also alter gene expression in

Aspergillus oryzae. The effect of adding or removing specific organic and inorganic nutrients

from media on the growth of filamentous fungi is also better understood. When comparing

data sets or designing experiments to address these issues, the effects of using distinctly

different media should be considered. This is an area that would benefit from further work

aimed at exploring these effects.

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Figure 20. Number of homologous genes significantly differentially expressed

(multiple comparisons corrected P value of < 0.05, Benjamini-Hochberg method)

between time points, shown over time. Green represents the number of A. niger genes,

red represents the number of R. delemar genes, and dark red represents the number of

R. delemar genes found in high-synteny regions of the R. delemar genome.

139

Conclusions

This transcriptional analysis reveals that a temporal transcriptional pattern governs

germination of R. delemar spores (Figure 1). Phenotype-specific (resting spore, swelling

spore, hyphal fungi) transcript clusters (Figure 2-5) are identified, and along with pairwise

differential expression analysis (Figure 6), it is shown that resting spores appear

transcriptionally unique. In comparison, swelling spores appear transcriptionally consistent,

whilst the switch to hyphal growth is underpinned by a significant change in the

transcriptional landscape. Paired with this, analysis of metabolic transcripts (Figure 7),

predicted pathways (Figure 8) and co-transcriptional networks (Figure 9-11) reveal a

reliance of germinating spores on ROS resistance, cell wall remodelling components, protein

synthesis apparatus, and iron acquisition and transport components. Analysis of duplicated

gene pairs highlight individual genes which may be important for germination control.

Homology searching reveals the dynamic regulation of germination and growth

regulators, with homologues in well-studied fungi and plants. Finally, a comparison of

germinating A. niger and R. delemar transcription demonstrates the presence of a

‘core set’ of genes conserved throughout germination, however genes unique to

each species are also abundant.

Discussion

The above results increase our understanding of the molecular mechanisms

controlling germination in R. delemar. They show that the initiation of germination

entails a huge transcriptional shift; ROS resistance and respiration are required for

germination to occur, while actin, chitin, and cytoskeletal components appear to play key

140

roles in initiating isotropic swelling and hyphal growth. Iron acquisition, Fe-S cluster

regulation and sulphur metabolism were also key features of the germination transcriptome,

confirming that R. delemar relies upon iron not only for pathogenesis (Ibrahim et al. 2010),

but also for germination (Kousser et al. 2019). Transcripts co-expressed at the defined

stages of germination (and unique to these stages) share functions in protein synthesis.

This may offer regulation of protein processes, whilst maintaining specificity to

morphological stage. R. delemar shares many transcriptional traits with A. niger at

germination initiation; however, transcriptional features unique to R. delemar indicate

that the duplicated nature of the genome may allow for alternative regulation of this

process. Transcriptional results demonstrate the potential of light, fungal hormones and

plant hormones to regulate germination. Specifically, resting spores show increased

expression of bcABA2 homologues (Figure 14), which may inhibit fungal

germination, similarly to P. patens spore germination inhibition via ABA (Moody et al. 2016).

It should be noted that the custom annotation which predicted DELLA-like and GLP-like

activity did not provide specific species homologues. As plant homologues were not detected

through a traditional blastP approach, these results should be taken with caution. The

hyphal form shows increased expression of both cryptochrome and white

collar homologues, indicating that light sensing may play a role in germination

regulation and hyphal development, as it does in A. fumigatus and the phototrophic P.

blakesleeanus (Fuller et al. 2013; Idnurm et al. 2005). It should be noted that other

homologues of the genes discussed here may exist within the R. delemar genome

(Appendix Homology Trees), however only those which were differentially expressed

(FDR < 0.001) over all time points have been investigated here. As a result, constituent

expression is not discussed here, but should be investigated in further studies. These

results have provided a significant overview of the transcriptome of germinating spores

and expanded current knowledge in the Mucorales field.

141

Further Work

Further work focusing on the elucidation of genes essential to germination would benefit the

field. Whilst co-expression network analysis aimed to reveal these, the networks (Figure

9-11) were ultimately too large to provide a practical list of candidate genes. To determine

germination essential genes, transcriptional studies focusing on the times of phenotypic

change (0-2hr, 4-6hr, 6-12hr), sampling at smaller intervals (every 10 minutes), would

likely provide better information about germination specific genes. Further analysis of

duplicated gene pairs might also aid in the identification of germination specific

genes. Producing knockout mutants of the genes proposed here (Figure 13), which

could be screened for germination defects, would confirm whether these candidate

genes have diverged in function, and whether they play specific roles in germination. A full

transcription factor annotation of the R. delemar genome, combined with an integrated ChIP-

Seq RNA-Seq experimental approach, would also aid in determining germination regulation.

This approach would generate germination-essential gene candidates via analysis of

differentially regulated gene networks. Generation of a CRISPR-Cas9 knock out library in

R. delemar might also identify germination specific genes. Germination specific genes

would be attractive drug targets, as mucormycete germination within the host contributes

to pathogenesis. Use of a metabolomics approach would aid in the validation of

the PathwayTools pathway predictions, and may result in identification of natural

compounds with therapeutic activities, as is common for secondary metabolites of fungi.

142

Chapter 5: Transcriptional Regulation of Rhizopus-Macrophage Interactions

The following text and figures have been previously published, or are adapted from the article

“Host-pathogen transcriptomics of macrophages, Mucorales and their endosymbionts: a

polymicrobial pas de trois” (Sephton-Clark et al. 2019). For this article, I conceived, designed

and performed experiments, collected the data, performed the analysis and interpretation,

wrote the manuscript, completed revisions and prepared the figures.

This chapter will introduce the host-pathogen interactions which govern mucormycosis and

immunity. An introduction to how bacterial endosymbionts impact pathogenicity of

mucorales species will also be given. Results will describe the differential interactions of two

Mucorales species (Rhizopus delemar RA 99-880 and the UoB strain of Rhizopus microsporus)

with the innate immune system, and their interactions with environmental bacterial

endosymbionts. The transcriptional responses of R. delemar and R. microsporus to innate

immune cells, and the corresponding immune cell response will be examined. The variation

in these responses will be assessed, given the presence or absence of bacterial

endosymbionts within the fungi. It can be seen that the fungal response is driven by

interaction with innate immune cells. The effect of the bacterial endosymbiont on the fungus

is species specific, with a minimal effect in the absence of stress, but strongly influencing

fungal expression during spore interactions with innate immune cells. In contrast, the

macrophage response varies depending on the infecting fungal species, but also depending

on endosymbiont status. The most successful macrophages elicit a pro-inflammatory

response, and through germination inhibition macrophage survival is enhanced. This reveals

143

species-specific host responses to related Mucorales species and shows that bacterial

endosymbionts impact the innate immune cell response.

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Host-Pathogen Interactions in Mucormycosis

Mucormycosis has been studied in the context of mucorales-host interactions using model

organisms and in vitro tissue culture methods. Mouse models have shown that spore

interactions with endothelial cells are vital to causing diseases in immunocompromised

individuals, as pathogenicity is linked to the variable copy number of the gene encoding CotH,

a family of cell surface proteins important for the spores’ adherence to the GRP (glucose

regulated protein) receptors on endothelial cells (Liu et al. 2010; Gebremariam et al. 2014;

Watkins et al. 2018). Mouse studies have also revealed the reliance of mucorales spores on

free iron to cause invasive mucormycosis. The DKA ( Diabetic Ketoacidic) mouse model

is more susceptible to developing mucormycosis (Gebremariam et al. 2016). DKA and other

acidosis disorders result in pH-mediated dissociation of iron from protein

transporters, resulting in elevated concentrations of free iron within individuals. This is

clearly seen in patient data, as individuals with elevated iron concentrations (within

serum) are highly susceptible to mucormycosis (Ibrahim, 2014).

This reliance on iron is also seen in vitro. Iron limitation has been reported as a mechanism

by which macrophages control mucorales spore germination, whilst iron-scavenging

pathways have been reported to confer pathogenicity to Rhizopus spp. (Andrianaki et al.

2018; Chibucos et al. 2016). The reliance on innate immune cells such as macrophages to

control spores has been demonstrated in the established zebra fish model (Voelz et al.

2015). Within the zebra fish model, innate immune cells form granuloma- like structures

around infecting mucorales spores. In doing so they inhibit spore germination,

dissemination and delay invasive infection (Inglesfield et al. 2018). In an

immunocompromised zebra fish model,

145

these innate granulomas are less likely to form, and infecting spores rapidly disseminate,

leading to uncontrolled infection and increased mortality rates (Inglesfield et al. 2018).

The interaction between host and mucorales spore can be further regulated by the presence

of an endosymbiont (Itabangi et al. 2019; Partida-Martinez & Hertweck 2005). Many

Mucorales species have been shown to harbour bacterial endosymbionts whose species can

vary between Mucorales isolates (Ibrahim et al. 2008; Kobayashi & Crouch 2009; Mondo et

al. 2017; Itabangi et al. 2019). Itabangi et al. recently explored the effect of an endosymbiont

on the interaction between R. microsporus and innate immune cells. This study has shown

that a bacterial endosymbiont influences the outcome of Rhizopus microsporus infections in

both zebrafish and murine models, through modulation of both fungal and phagocyte

phenotypes (Itabangi et al. 2019).

It is clear that understanding the interaction between Mucorales spores, their endosymbionts

and innate immune cells is key to understanding mucormycosis. Studies frequently focus

upon the interaction of a single species of the Mucorales order with innate immune cells

(Warris et al. 2005; Chamilos et al. 2008; Schmidt et al. 2013; Kraibooj et al. 2014; Inglesfield

et al. 2018), despite numerous phenotypic and genomic differences existing between

Mucorales species and infecting isolates (Hoffmann et al. 2013; Mendoza et al. 2014;

Schwartze et al. 2014). Several works comparing Aspergillus spp. to Rhizopus spp. have

revealed similar immunostimulatory capacities, but differences in their responses to host

stress (Warris et al. 2005; Chamilos et al. 2008; Schmidt et al. 2013; Kraibooj et al. 2014).

Exploring and understanding fungal responses to the host is essential to improving our

understanding of mucormycosis, yet it remains unclear how Mucorales species respond to,

146

and interact with, the innate immune system, and to what extent this varies by species and

endosymbiont presence.

This work explores the interplay between phagocytes, R. delemar, and R. microsporus using

fungal isolates found to harbour bacterial endosymbionts (Itabangi et al. 2019). This work

investigates the differences between these two fungal species, how they respond

transcriptionally to innate immune cells, and how their respective bacterial endosymbionts

affect this interaction. This work also explores the transcriptional response of innate immune

cells to these infectious spores, and determines how their response is influenced by the

presence of an endosymbiont.

147

Results

To better understand the interactions between Mucorales spores and innate immune cells, I

performed a paired transcriptional study to identify responses of macrophages and fungal

spores, whilst exploring the influence of the endosymbiont on this interaction. Rhizopus

delemar and Rhizopus microsporus spores were either cured via ciprofloxacin treatment to

remove the bacterial endosymbiont (cured) or maintained in media permissive to bacterial

endosymbiosis (wt). Cured spores were passaged twice in the absence of ciprofloxacin to limit

the impact of the drug on transcriptional responses. The cured and wt spores of both R.

delemar and R. microsporus were allowed to swell in sabouraud broth (SAB) until 95% of the

population had reached mid isotropic phase (Sephton-Clark et al. 2018). Due to the

differences in germination rates between the species (Chapter 2), this occurred at 2 hours for

R. delemar and 4 hours for R. microsporus. Swollen spores were then used to infect the J774.1

murine macrophage-like cell line. Swollen fungal spores were co-cultured with macrophages

for one hour, after which unengulfed spores were removed, and phagocytosed spores were

incubated within the macrophages for a further two hours. In all cases 95% phagocytosis

was achieved. Macrophages and spores from the resulting infection were processed to

explore their transcriptional response to this infection scenario. Macrophages that had

phagocytosed swollen fungal spores (cured and wt) were isolated and sequenced via the

10X Genomics Chromium Single Cell Sequencing platform. Macrophages left unexposed

to the fungi were used as a negative control. RNA was also isolated from fungal spores

(cured and wt) which had been engulfed by macrophages, and this was sequenced with a

bulk RNA-Seq approach. Unexposed fungi (cured and wt) were incubated in macrophage

media (serum-free Dulbeccos Modified Eagle Medium) for a matched time and used as

a negative control.

148

The Fungal Response

The overall response to phagocytosis from R. delemar and R. microsporus, obtained through

the bulk RNA-Seq approach, was examined with principle component analysis (PCA) (Figure

1). Large differences between the transcriptomes of both fungal species can be observed,

when exposed or unexposed to macrophages, while the presence or absence of their

respective endosymbionts has a weak but differential effect on PCA (Figure 1). The presence

or absence of the endosymbiont appears to have very little bearing on the transcriptional

patterns displayed by R. delemar, as samples fell into two distinct clusters, most strongly

influenced by macrophage status (Figure 1a). R. microsporus exhibits a similar trend upon

exposure to macrophages, however the presence of the endosymbiont influenced clustering

more so (Figure 1b). Itabangi et al., show that the presence of the endosymbiont Ralstonia

pickettii impacts fungal cell wall organization, resistance to host-relevant stress,

spore germination efficiency, and pathogenesis of R. microsporus (Itabangi et al. 2019).

It should be noted that both sample groups contain an outlier. Given the smaller range of the

R. microsporus PCA axis (Figure 1b), the outlier for this group appears to effect grouping less,

compared to the R. delemar outlier. The outliers were both processed in separate biological

experiments, and both samples obtained a good read level and alignment level when

sequenced and processed with the bioinformatics pipeline. As the cause could not be

determined in either instance, and it is not recommended to calculate significant differential

expression with two biological repeats, the outliers were kept in for analysis. It should

therefore be noted that the results may be skewed due to the outliers presence. This will

be extenuated due to the strict statistical thresholds imposed. To improve the results, a

fourth biological repeat should be performed in the future, time and cost permitting.

149

Figure 1. Principal component analysis of fungal genes differentially expressed across all

samples. A) R. delemar wt and cured, macrophage engulfed or serum free DMEM (dulbecco's

modified eagle medium) control. B) R. microsporus wt and cured, macrophage engulfed or

serum free DMEM control. Biological replicates (n=3) are shown for each sample.

There are 2,493 genes that are significantly differentially expressed (Log fold change > 2; false

discovery rate < 0.05) in R. delemar across all conditions (Figure 2a), while R.

microsporus only exhibits 40 genes significantly differentially expressed across all

conditions (Log fold change > 2; false discovery rate < 0.05) (Figure 2b). The theme of a

muted transcriptional response from R. microsporus is also seen within pairwise comparisons

of conditions. Pairwise comparisons of differential expression across each experimental

condition show similar trends in responses between R. delemar and R. microsporus,

however R. microsporus responds with a reduced gene set (Figure 3). The limited

response of R. microsporus may be due to a differential growth stage. As R. microsporus

germinates slower than R. delemar, after 3 hours within the phagosome R. microsporus

may not have reached the same morphological growth stage as R. delemar, contributing to

an apparent muted response. Pairwise comparisons showed the biggest shift in

transcriptional response when comparing phagocytosed fungal spores to those unexposed

●

●

●

−30 −20 −10 0 10 20

010

2030

PC 1 (72.54%)

PC 2

(9.6

7%)

● cond_0cond_1

cond_2cond_3

●

●●

0 10 20 30

−10

−50

5

PC 2 (9.67%)

PC 3

(4.0

0%)

● cond_0cond_1

cond_2cond_3

●

●

●

−30 −20 −10 0 10 20

010

2030

PC 1 (72.54%)

PC 2

(9.6

7%)

● cond_0cond_1

cond_2cond_3

●

●●

0 10 20 30

−10

−50

5

PC 2 (9.67%)

PC 3

(4.0

0%)

● cond_0cond_1

cond_2cond_3

Macrophages + R. delemar WT

R. delemar WT

●

●

●

−30 −20 −10 0 10 20

010

2030

PC 1 (72.54%)

PC 2

(9.6

7%)

● cond_0cond_1

cond_2cond_3

●

●●

0 10 20 30

−10

−50

5

PC 2 (9.67%)

PC 3

(4.0

0%)

● cond_0cond_1

cond_2cond_3

Macrophages + R. delemar cured

R. delemar curedA

●●

●

−0.35 −0.30 −0.25 −0.20 −0.15

−0.4

−0.2

0.0

0.2

PC 1 (91.72%)

PC 2

(5.9

8%)

● cond_0cond_1

cond_2cond_3

●●

●

−0.4 −0.2 0.0 0.2

−0.8

−0.4

0.0

0.4

PC 2 (5.98%)

PC 3

(0.7

8%)

● cond_0cond_1

cond_2cond_3

●

●

●

−30 −20 −10 0 10 20

010

2030

PC 1 (72.54%)

PC 2

(9.6

7%)

● cond_0cond_1

cond_2cond_3

●

●●

0 10 20 30

−10

−50

5

PC 2 (9.67%)

PC 3

(4.0

0%)

● cond_0cond_1

cond_2cond_3

Macrophages + R. microsporus WT

R. microsporus WT

●

●

●

−30 −20 −10 0 10 200

1020

30

PC 1 (72.54%)

PC 2

(9.6

7%)

● cond_0cond_1

cond_2cond_3

●

●●

0 10 20 30

−10

−50

5

PC 2 (9.67%)

PC 3

(4.0

0%)

● cond_0cond_1

cond_2cond_3

Macrophages + R. microsporus cured

R. microsporus curedB

150

to macrophages, regardless of endosymbiont status. When phagocytosed (Figure 4), R.

microsporus upregulates genes enriched in GO categories corresponding to

thiamine metabolism, sulfur metabolism, glycerol metabolism, alcohol

dehydrogenase activity and transmembrane transporter activity (hypergeometric test,

corrected P value < 0.05). This is consistent with the fungal response seen to

macrophage stress (Parente-Rocha et al. 2015), and the micronutrient scavenging

response to nutritional immunity (Ballou and Wilson 2016; Shen et al. 2018;

Andrianaki et al. 2018). Phagocytosed R. microsporus downregulated genes

enriched in GO categories corresponding to rRNA processing, ribosome

biogenesis and ribosome localization (hypergeometric test, corrected P value < 0.05)

(Figure 4), consistent with growth arrest within the phagolysosome (Inglesfield et al.

2018; Andrianaki et al. 2018)

151

152

149

cond_0

cond_1

cond_2

cond_3

cond_3_rep2

cond_3_rep1

cond_1_rep3

cond_1_rep1

cond_1_rep2

cond_3_rep3

cond_0_rep2

cond_2_rep1

cond_0_rep3

cond_0_rep1

cond_2_rep3

cond_2_rep2

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samples vs. features diffExpr.P0.001_C2.matrix.log2.centered

−6 −2 2 6Value

Color Key

LogFC

With MacrophagesWithout Macrophages

R. delemar curedMacrophages + R. delemar cured

Macrophages + R. delemar WTR. delemar WTcond_3_rep2

cond_3_rep1

cond_1_rep3

cond_1_rep1

cond_1_rep2

cond_3_rep3

cond_0_rep2

cond_2_rep1

cond_0_rep3

cond_0_rep1

cond_2_rep3

cond_2_rep2

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3G_016500RO3G_014317RO3G_002450RO3G_002306RO3G_005048RO3G_005388RO3G_001644RO3G_000524RO3G_016367RO3G_006092RO3G_010985RO3G_014337RO3G_007421RO3G_004738RO3G_009196RO3G_017010RO3G_015336RO3G_008418RO3G_001001RO3G_004915RO3G_004734RO3G_014742RO3G_014837RO3G_008881RO3G_014385RO3G_010479RO3G_015417RO3G_017183RO3G_007484RO3G_006737RO3G_002186RO3G_015192RO3G_013575RO3G_013855RO3G_006738RO3G_003046RO3G_014349RO3G_015825RO3G_003348RO3G_002583RO3G_009623RO3G_016216RO3G_008066RO3G_002625RO3G_000930RO3G_011419RO3G_008657RO3G_002480RO3G_007709RO3G_009618RO3G_000890RO3G_015648RO3G_007817RO3G_004528RO3G_001214RO3G_009987RO3G_004595RO3G_015120RO3G_003599RO3G_016297RO3G_013179RO3G_009918RO3G_010270RO3G_009034RO3G_008791RO3G_011757RO3G_016283RO3G_017145RO3G_003930RO3G_013289RO3G_001935RO3G_009632RO3G_009493RO3G_008984RO3G_006981RO3G_016460RO3G_010707RO3G_005465RO3G_005982RO3G_004253RO3G_003332RO3G_005865RO3G_017272RO3G_001153RO3G_016614RO3G_013715RO3G_015320RO3G_013588RO3G_004968RO3G_002035RO3G_009332RO3G_009824RO3G_009823RO3G_017405RO3G_009363RO3G_012400RO3G_005831RO3G_010779RO3G_000539RO3G_008064RO3G_008040RO3G_006681RO3G_004532RO3G_000118RO3G_005623RO3G_009521RO3G_004534RO3G_004329RO3G_002140RO3G_009130RO3G_001558RO3G_008132RO3G_017644RO3G_004516RO3G_014017RO3G_009601RO3G_005880RO3G_009173RO3G_012278RO3G_004355RO3G_008327RO3G_009631RO3G_000327RO3G_002091RO3G_017816RO3G_017837RO3G_010736RO3G_003330RO3G_003682RO3G_007755RO3G_014344RO3G_004314RO3G_001117RO3G_001490RO3G_014969RO3G_015175RO3G_000976RO3G_016153RO3G_012457RO3G_015117RO3G_007186RO3G_004091RO3G_012239RO3G_013933RO3G_004526RO3G_011742RO3G_011560RO3G_013789RO3G_009295RO3G_008162RO3G_013983RO3G_005797RO3G_011792RO3G_011476RO3G_016282RO3G_012910RO3G_001869RO3G_017093RO3G_009484RO3G_007745RO3G_001115RO3G_006143RO3G_007523RO3G_006658RO3G_014696RO3G_016116RO3G_007284RO3G_017022RO3G_003134RO3G_003677RO3G_007504RO3G_003657RO3G_005587RO3G_008732RO3G_002816RO3G_011823RO3G_010483RO3G_000494RO3G_008665RO3G_011407RO3G_016122RO3G_015791RO3G_015322RO3G_003594RO3G_010883RO3G_012185RO3G_016040RO3G_015775RO3G_007702RO3G_008225RO3G_002823RO3G_015297RO3G_015317RO3G_003163RO3G_015793RO3G_015346RO3G_012066RO3G_015307RO3G_007882RO3G_009081RO3G_016067RO3G_007561RO3G_004921RO3G_013990RO3G_005222RO3G_015875RO3G_016666RO3G_008392RO3G_007058RO3G_014733RO3G_011413RO3G_004211RO3G_017012RO3G_010184RO3G_001515RO3G_002513RO3G_010562RO3G_009430RO3G_015806RO3G_015112RO3G_012458RO3G_006013RO3G_003052RO3G_005608RO3G_005618RO3G_009713RO3G_016898RO3G_005796RO3G_011006RO3G_003151RO3G_005857RO3G_014550RO3G_014912RO3G_013328RO3G_010129RO3G_015212RO3G_001529RO3G_014133RO3G_009293RO3G_004543RO3G_011643RO3G_010006RO3G_012081RO3G_016809RO3G_004804RO3G_002672RO3G_014503RO3G_012289RO3G_003700RO3G_003708RO3G_006668RO3G_009067RO3G_009064RO3G_011478RO3G_001220RO3G_013719RO3G_003647RO3G_016070RO3G_016610RO3G_009033RO3G_012802RO3G_003666RO3G_005939RO3G_000143RO3G_000446RO3G_017335RO3G_007158RO3G_001320RO3G_015591RO3G_012210RO3G_015551RO3G_014237RO3G_000191RO3G_016688RO3G_015161RO3G_008751RO3G_002436RO3G_017412RO3G_004990RO3G_017378RO3G_011644RO3G_004462RO3G_015563RO3G_013547RO3G_011716RO3G_012839RO3G_008001RO3G_008710RO3G_014992RO3G_013056RO3G_005981RO3G_011839RO3G_011144RO3G_008707RO3G_002896RO3G_002072RO3G_010231RO3G_002093RO3G_006341RO3G_005453RO3G_007706RO3G_009529RO3G_011494RO3G_015848RO3G_002903RO3G_015598RO3G_013035RO3G_006074RO3G_008390RO3G_009485RO3G_005305RO3G_016052RO3G_003679RO3G_011355RO3G_007318RO3G_005853RO3G_012071RO3G_012699RO3G_015390RO3G_005162RO3G_001178RO3G_007820RO3G_012430RO3G_005571RO3G_013431RO3G_004451RO3G_010229RO3G_004055RO3G_005518RO3G_009607RO3G_017418RO3G_003540RO3G_009138RO3G_009063RO3G_004202RO3G_004115RO3G_005077RO3G_017034RO3G_002463RO3G_011523RO3G_011165RO3G_002538RO3G_013288RO3G_000254RO3G_000883RO3G_017314RO3G_005748RO3G_014934RO3G_005597RO3G_005996RO3G_009556RO3G_008364RO3G_003439RO3G_012098RO3G_014049RO3G_012267RO3G_006953RO3G_004097RO3G_004178RO3G_004101RO3G_004251RO3G_009218RO3G_005047RO3G_004494RO3G_001160RO3G_010579RO3G_011038RO3G_002534RO3G_006409RO3G_001323RO3G_004491RO3G_003563RO3G_007770RO3G_006291RO3G_003705RO3G_011782RO3G_008357RO3G_000242RO3G_007744RO3G_013591RO3G_007822RO3G_012625RO3G_007356RO3G_010473RO3G_006096RO3G_010983RO3G_001261RO3G_001462RO3G_015991RO3G_008987RO3G_004162RO3G_009604RO3G_001187RO3G_006402RO3G_005488RO3G_011535RO3G_010185RO3G_003701RO3G_003702RO3G_001489RO3G_005594RO3G_007143RO3G_015743RO3G_000221RO3G_016220RO3G_016123RO3G_009537RO3G_008243RO3G_000475RO3G_016270RO3G_000477RO3G_000476RO3G_002217RO3G_005516RO3G_008024RO3G_002918RO3G_004356RO3G_005483RO3G_003617RO3G_003763RO3G_017100RO3G_003019RO3G_009495RO3G_002933RO3G_013852RO3G_002412RO3G_012013RO3G_009436RO3G_006427RO3G_003154RO3G_017122RO3G_005999RO3G_014996RO3G_002224RO3G_010981RO3G_015299RO3G_006027RO3G_008758RO3G_009669RO3G_016059RO3G_000434RO3G_012220RO3G_010175RO3G_000456RO3G_004092RO3G_007147RO3G_001161RO3G_006725RO3G_005197RO3G_005485RO3G_009715RO3G_004458RO3G_001377RO3G_005565RO3G_006803RO3G_012413RO3G_005582RO3G_003581RO3G_012287RO3G_009089RO3G_004087RO3G_013982RO3G_017423RO3G_009106RO3G_003872RO3G_002148RO3G_007159RO3G_009646RO3G_006406RO3G_009922RO3G_015989RO3G_014868RO3G_017048RO3G_001376RO3G_009249RO3G_000463RO3G_009091RO3G_005612RO3G_006723RO3G_009085RO3G_010711RO3G_016532RO3G_016152RO3G_010246RO3G_006032RO3G_006034RO3G_015655RO3G_001698RO3G_010785RO3G_001549RO3G_013156RO3G_015099RO3G_016094RO3G_001805RO3G_012212RO3G_016224RO3G_013149RO3G_013907RO3G_002919RO3G_006665RO3G_008152RO3G_017708RO3G_011423RO3G_000510RO3G_008857RO3G_010179RO3G_009912RO3G_011163RO3G_014293RO3G_002144RO3G_012392RO3G_013186RO3G_015177RO3G_007078RO3G_004745RO3G_002225RO3G_010776RO3G_011311RO3G_012146RO3G_007059RO3G_001638RO3G_015402RO3G_012141RO3G_002645RO3G_001495RO3G_004335RO3G_014240RO3G_003409RO3G_005383RO3G_005025RO3G_012099RO3G_002114RO3G_010030RO3G_013155RO3G_008154RO3G_016768RO3G_010268RO3G_016502RO3G_002646RO3G_001885RO3G_007043RO3G_007044RO3G_012437RO3G_003486RO3G_017722RO3G_008697RO3G_015351RO3G_006982RO3G_017430RO3G_006425RO3G_009516RO3G_007777RO3G_001240RO3G_016150RO3G_006183RO3G_015040RO3G_008908RO3G_009422RO3G_014548RO3G_008886RO3G_004975RO3G_007034RO3G_016043RO3G_012756RO3G_016148RO3G_008379RO3G_005509RO3G_016850RO3G_013299RO3G_013178RO3G_010860RO3G_001799RO3G_012475RO3G_011384RO3G_012686RO3G_002316RO3G_001238RO3G_003054RO3G_015958RO3G_016366RO3G_012410RO3G_007829RO3G_013247RO3G_014707RO3G_011128RO3G_016278RO3G_002745RO3G_016154RO3G_001942RO3G_013634RO3G_012012RO3G_001341RO3G_001819RO3G_007524RO3G_012938RO3G_005625RO3G_016115RO3G_004822RO3G_008353RO3G_006080RO3G_009473RO3G_004098RO3G_014708RO3G_002969RO3G_016466RO3G_013614RO3G_000982RO3G_005795RO3G_001893RO3G_009710RO3G_008346RO3G_013099RO3G_009296RO3G_016813RO3G_009355RO3G_016537RO3G_017027RO3G_002154RO3G_011984RO3G_005446RO3G_008122RO3G_015697RO3G_003645RO3G_002146RO3G_016539RO3G_016538RO3G_009331RO3G_011844RO3G_001745RO3G_007362RO3G_016680RO3G_016462RO3G_001256RO3G_014719RO3G_003035RO3G_003141RO3G_008817RO3G_015801RO3G_006133RO3G_009645RO3G_012784RO3G_015550RO3G_001342RO3G_005633RO3G_009086RO3G_011731RO3G_005073RO3G_009472RO3G_009622RO3G_015882RO3G_012943RO3G_010719RO3G_012442RO3G_013838RO3G_013566RO3G_003676RO3G_012326RO3G_016681RO3G_016575RO3G_006424RO3G_005283RO3G_007525RO3G_011564RO3G_012844RO3G_006384RO3G_003036RO3G_016781RO3G_004107RO3G_002960RO3G_011388RO3G_012785RO3G_007081RO3G_002240RO3G_013176RO3G_010720

−6 −2 2 6Value

Color Key

cond_0

cond_1

cond_2

cond_3

cond_2_rep1

cond_0_rep2

cond_0_rep1

cond_2_rep2

cond_2_rep3

cond_3_rep1

cond_3_rep2

cond_3_rep3

cond_1_rep1

cond_0_rep3

cond_1_rep2

cond_1_rep3

RHIMIDRAFT_283813

RHIMIDRAFT_245669

RHIMIDRAFT_242387

RHIMIDRAFT_96114

RHIMIDRAFT_248707

RHIMIDRAFT_196349

RHIMIDRAFT_197836

RHIMIDRAFT_234322

RHIMIDRAFT_99785

RHIMIDRAFT_314936

RHIMIDRAFT_232533

RHIMIDRAFT_245053

RHIMIDRAFT_290452

RHIMIDRAFT_294525

RHIMIDRAFT_307836

RHIMIDRAFT_288174

RHIMIDRAFT_251305

RHIMIDRAFT_307408

RHIMIDRAFT_267844

RHIMIDRAFT_198874

RHIMIDRAFT_79038

RHIMIDRAFT_240622

RHIMIDRAFT_289002

RHIMIDRAFT_270714

RHIMIDRAFT_253108

RHIMIDRAFT_281133

RHIMIDRAFT_257184

RHIMIDRAFT_239731

RHIMIDRAFT_87630

RHIMIDRAFT_138553

RHIMIDRAFT_272110

RHIMIDRAFT_288130

RHIMIDRAFT_203580

RHIMIDRAFT_313047

RHIMIDRAFT_221939

RHIMIDRAFT_252367

RHIMIDRAFT_271682

RHIMIDRAFT_252937

RHIMIDRAFT_195307

RHIMIDRAFT_138931


−4 0 2 4Value

Color Key

With Macrophages

Without Macrophages

R. microsporus curedMacrophages + R. microsporus cured

Macrophages + R. microsporus WTR. microsporus WT

A B

LogFC

Figure 2. Clustering of fungal transcriptional changes. A) Heatmap displaying significantly differentially expressed genes in R. delemar. Expression

levels are plotted in Log2, space and mean-centered (FDR < 0.001) B) Heatmap displaying significantly differentially expressed genes in R.

microsporus. Expression levels are plotted in Log2, space and mean-centered (FDR < 0.001). Biological replicates (n=3) are shown for each sample.

152

153

Figure 3. Differential expression of fungal genes in compared conditions. The graph displays

the number of genes significantly differentially expressed (multiple comparisons corrected P

value < 0.05) between samples listed on the X axis. Blue bars indicate genes with an increase

in expression (LogFC > 2), whilst orange bars indicate genes with a decrease in expression

(LogFC < −2). Averages are taken from data produced with 3 biological replicates (n=3) for

each sample.

DEM

v D

E

DEM

v D

E

MEM

v M

E

MEM

v M

E

DEM

v D

M

DEM

v D

M

MEM

v M

M

MEM

v M

M

DEM

v D

DEM

v D

MEM

v M

MEM

v M

DE

v D

M

DE

v D

M

ME

v M

M

ME

v M

M

DE

v D

DE

v D

ME

v M

ME

v M

DM

v D

DM

v D

MM

v M

MM

v M

Differentially Expressed Genes from Pairwise Comparisons of R. microsporus and R. delemar Samples

No.

Diff

eren

tially

Exp

ress

ed G

enes

(Log

2FC

> 2

or <

−2,

FD

R <

0.0

5)

−1500

−1000

−500

0

500

1000

1500

1137

−472

1

−6

0

0

0

0

1072

−590

336

−209

778

−1325

8

−2

0

−1

3

0

1285

−878

277

−82

DEM

v D

E

DEM

v D

E

MEM

v M

E

MEM

v M

E

DEM

v D

M

DEM

v D

M

MEM

v M

M

MEM

v M

M

DEM

v D

DEM

v D

MEM

v M

MEM

v M

DE

v D

M

DE

v D

M

ME

v M

M

ME

v M

M

DE

v D

DE

v D

ME

v M

ME

v M

DM

v D

DM

v D

MM

v M

MM

v M


No.

Diff

eren

tially

Exp

ress

ed G

enes

(Log

2FC

> 2

or <

−2,

FD

R <

0.0

5)

−1500

−1000

−500

0

500

1000

1500

1137

−472

1

−6

0

0

0

0

1072

−590

336

−209

778

−1325

8

−2

0

−1

3

0

1285

−878

277

−82

DEM

v D

E

DEM

v D

E

MEM

v M

E

MEM

v M

E

DEM

v D

M

DEM

v D

M

MEM

v M

M

MEM

v M

M

DEM

v D

DEM

v D

MEM

v M

MEM

v M

DE

v D

M

DE

v D

M

ME

v M

M

ME

v M

M

DE

v D

DE

v D

ME

v M

ME

v M

DM

v D

DM

v D

MM

v M

MM

v M


No.

Diff

eren

tially

Exp

ress

ed G

enes

(Log

2FC

> 2

or <

−2,

FD

R <

0.0

5)

−1500

−1000

−500

0

500

1000

1500

1137

−472

1

−6

0

0

0

0

1072

−590

336

−209

778

−1325

8

−2

0

−1

3

0

1285

−878

277

−82D

EM v

DE

DEM

v D

E

MEM

v M

E

MEM

v M

E

DEM

v D

M

DEM

v D

M

MEM

v M

M

MEM

v M

M

DEM

v D

DEM

v D

MEM

v M

MEM

v M

DE

v D

M

DE

v D

M

ME

v M

M

ME

v M

M

DE

v D

DE

v D

ME

v M

ME

v M

DM

v D

DM

v D

MM

v M

MM

v M


No.

Diff

eren

tially

Exp

ress

ed G

enes

(Log

2FC

> 2

or <

−2,

FD

R <

0.0

5)

−1500

−1000

−500

0

500

1000

1500

1137

−472

1

−6

0

0

0

0

1072

−590

336

−209

778

−1325

8

−2

0

−1

3

0

1285

−878

277

−82

DEM

v D

E

DEM

v D

E

MEM

v M

E

MEM

v M

E

DEM

v D

M

DEM

v D

M

MEM

v M

M

MEM

v M

M

DEM

v D

DEM

v D

MEM

v M

MEM

v M

DE

v D

M

DE

v D

M

ME

v M

M

ME

v M

M

DE

v D

DE

v D

ME

v M

ME

v M

DM

v D

DM

v D

MM

v M

MM

v M


No.

Diff

eren

tially

Exp

ress

ed G

enes

(Log

2FC

> 2

or <

−2,

FD

R <

0.0

5)

−1500

−1000

−500

0

500

1000

1500

1137

−472

1

−6

0

0

0

0

1072

−590

336

−209

778

−1325

8

−2

0

−1

3

0

1285

−878

277

−82

DEM

v D

E

DEM

v D

E

MEM

v M

E

MEM

v M

E

DEM

v D

M

DEM

v D

M

MEM

v M

M

MEM

v M

M

DEM

v D

DEM

v D

MEM

v M

MEM

v M

DE

v D

M

DE

v D

M

ME

v M

M

ME

v M

M

DE

v D

DE

v D

ME

v M

ME

v M

DM

v D

DM

v D

MM

v M

MM

v M


No.

Diff

eren

tially

Exp

ress

ed G

enes

(Log

2FC

> 2

or <

−2,

FD

R <

0.0

5)

−1500

−1000

−500

0

500

1000

1500

1137

−472

1

−6

0

0

0

0

1072

−590

336

−209

778

−1325

8

−2

0

−1

3

0

1285

−878

277

−82

DEM

v D

E

DEM

v D

E

MEM

v M

E

MEM

v M

E

DEM

v D

M

DEM

v D

M

MEM

v M

M

MEM

v M

M

DEM

v D

DEM

v D

MEM

v M

MEM

v M

DE

v D

M

DE

v D

M

ME

v M

M

ME

v M

M

DE

v D

DE

v D

ME

v M

ME

v M

DM

v D

DM

v D

MM

v M

MM

v M


No.

Diff

eren

tially

Exp

ress

ed G

enes

(Log

2FC

> 2

or <

−2,

FD

R <

0.0

5)

−1500

−1000

−500

0

500

1000

1500

1137

−472

1

−6

0

0

0

0

1072

−590

336

−209

778

−1325

8

−2

0

−1

3

0

1285

−878

277

−82

DEM

v D

E

DEM

v D

E

MEM

v M

E

MEM

v M

E

DEM

v D

M

DEM

v D

M

MEM

v M

M

MEM

v M

M

DEM

v D

DEM

v D

MEM

v M

MEM

v M

DE

v D

M

DE

v D

M

ME

v M

M

ME

v M

M

DE

v D

DE

v D

ME

v M

ME

v M

DM

v D

DM

v D

MM

v M

MM

v M


No.

Diff

eren

tially

Exp

ress

ed G

enes

(Log

2FC

> 2

or <

−2,

FD

R <

0.0

5)

−1500

−1000

−500

0

500

1000

1500

1137

−472

1

−6

0

0

0

0

1072

−590

336

−209

778

−1325

8

−2

0

−1

3

0

1285

−878

277

−82

DEM

v D

E

DEM

v D

E

MEM

v M

E

MEM

v M

E

DEM

v D

M

DEM

v D

M

MEM

v M

M

MEM

v M

M

DEM

v D

DEM

v D

MEM

v M

MEM

v M

DE

v D

M

DE

v D

M

ME

v M

M

ME

v M

M

DE

v D

DE

v D

ME

v M

ME

v M

DM

v D

DM

v D

MM

v M

MM

v M

Differentially Expressed Genes from Pairwise Comparisons of R. microsporus and R. delemar SamplesN

o. D

iffer

entia

lly E

xpre

ssed

Gen

es (L

og2F

C >

2 o

r < −

2, F

DR

< 0

.05)

−1500

−1000

−500

0

500

1000

1500

1137

−472

1

−6

0

0

0

0

1072

−590

336

−209

778

−1325

8

−2

0

−1

3

0

1285

−878

277

−82

DEM

v D

E

DEM

v D

E

MEM

v M

E

MEM

v M

E

DEM

v D

M

DEM

v D

M

MEM

v M

M

MEM

v M

M

DEM

v D

DEM

v D

MEM

v M

MEM

v M

DE

v D

M

DE

v D

M

ME

v M

M

ME

v M

M

DE

v D

DE

v D

ME

v M

ME

v M

DM

v D

DM

v D

MM

v M

MM

v M


No.

Diff

eren

tially

Exp

ress

ed G

enes

(Log

2FC

> 2

or <

−2,

FD

R <

0.0

5)

−1500

−1000

−500

0

500

1000

1500

1137

−472

1

−6

0

0

0

0

1072

−590

336

−209

778

−1325

8

−2

0

−1

3

0

1285

−878

277

−82

DEM

v D

E

DEM

v D

E

MEM

v M

E

MEM

v M

E

DEM

v D

M

DEM

v D

M

MEM

v M

M

MEM

v M

M

DEM

v D

DEM

v D

MEM

v M

MEM

v M

DE

v D

M

DE

v D

M

ME

v M

M

ME

v M

M

DE

v D

DE

v D

ME

v M

ME

v M

DM

v D

DM

v D

MM

v M

MM

v M


No.

Diff

eren

tially

Exp

ress

ed G

enes

(Log

2FC

> 2

or <

−2,

FD

R <

0.0

5)

−1500

−1000

−500

0

500

1000

1500

1137

−472

1

−6

0

0

0

0

1072

−590

336

−209

778

−1325

8

−2

0

−1

3

0

1285

−878

277

−82

DEM

v D

E

DEM

v D

E

MEM

v M

E

MEM

v M

E

DEM

v D

M

DEM

v D

M

MEM

v M

M

MEM

v M

M

DEM

v D

DEM

v D

MEM

v M

MEM

v M

DE

v D

M

DE

v D

M

ME

v M

M

ME

v M

M

DE

v D

DE

v D

ME

v M

ME

v M

DM

v D

DM

v D

MM

v M

MM

v M


No.

Diff

eren

tially

Exp

ress

ed G

enes

(Log

2FC

> 2

or <

−2,

FD

R <

0.0

5)

−1500

−1000

−500

0

500

1000

1500

1137

−472

1

−6

0

0

0

0

1072

−590

336

−209

778

−1325

8

−2

0

−1

3

0

1285

−878

277

−82

WT+

Mac

roph

age

vs

WT

WT+

Mac

roph

age

vs

Cure

d +

Mac

roph

age

WT+

Mac

roph

age

vs

Cure

d

Cure

d +M

acro

phag

e vs

Cur

ed

WT

vs C

ured

WT

vs C

ured

+

Mac

roph

age

WT+

Mac

roph

age

vs

WT

WT+

Mac

roph

age

vs

Cure

d +

Mac

roph

age

WT+

Mac

roph

age

vs

Cure

d

Cure

d +M

acro

phag

e vs

Cur

ed

WT

vs C

ured

WT

vs C

ured

+

Mac

roph

age

R. delemar R. microsporus

154

Figure 4. Clustering of fungal transcription with functional annotation. Heatmap displaying

significantly differentially expressed genes in R. microsporus . Expression levels are plotted

in Log2, space and mean-centered (FDR < 0.001). Biological replicates (n=3) are shown for

each sample. Gene names and predicted functions can be found in the appendix

(R.microsporus_SigDE).

Comparisons of R. delemar conditions (Figure 5) reveal that, upon phagocytosis,

spores upregulate genes enriched in KEGG classifications corresponding to MAPK

signalling, phenylalanine metabolism, tyrosine metabolism, glutathione metabolism and

fatty acid synthesis (hypergeometric test, corrected P value < 0.05). Upregulation of these

processes is consistent with intra-phagosomal survival (Yadav et al. 2011; Lorenz and

Fink, 2005; Eisenman et al. 2011; Andrianaki et al. 2018).

cond_0

cond_1

cond_2

cond_3

cond_2_rep1

cond_0_rep2

cond_0_rep1

cond_2_rep2

cond_2_rep3

cond_3_rep1

cond_3_rep2

cond_3_rep3

cond_1_rep1

cond_0_rep3

cond_1_rep2

cond_1_rep3

RHIMIDRAFT_283813

RHIMIDRAFT_245669

RHIMIDRAFT_242387

RHIMIDRAFT_96114

RHIMIDRAFT_248707

RHIMIDRAFT_196349

RHIMIDRAFT_197836

RHIMIDRAFT_234322

RHIMIDRAFT_99785

RHIMIDRAFT_314936

RHIMIDRAFT_232533

RHIMIDRAFT_245053

RHIMIDRAFT_290452

RHIMIDRAFT_294525

RHIMIDRAFT_307836

RHIMIDRAFT_288174

RHIMIDRAFT_251305

RHIMIDRAFT_307408

RHIMIDRAFT_267844

RHIMIDRAFT_198874

RHIMIDRAFT_79038

RHIMIDRAFT_240622

RHIMIDRAFT_289002

RHIMIDRAFT_270714

RHIMIDRAFT_253108

RHIMIDRAFT_281133

RHIMIDRAFT_257184

RHIMIDRAFT_239731

RHIMIDRAFT_87630

RHIMIDRAFT_138553

RHIMIDRAFT_272110

RHIMIDRAFT_288130

RHIMIDRAFT_203580

RHIMIDRAFT_313047

RHIMIDRAFT_221939

RHIMIDRAFT_252367

RHIMIDRAFT_271682

RHIMIDRAFT_252937

RHIMIDRAFT_195307

RHIMIDRAFT_138931


−4 0 2 4Value

Color Key

With Macrophages

Without Macrophages

R. microsporus curedMacrophages + R. microsporus cured

Macrophages + R. microsporus WTR. microsporus WT

LogFC

rRNA Processing, Ribosome Biogenesis and localisation

Thiamine metabolism, sulphurmetabolism, glycerol metabolism, transmembrane transporter activity and alcohol dehydrogenase activity

155

Unexposed R. delemar spores upregulate genes enriched in KEGG classifications

corresponding to ketone body synthesis, protein processing via the endoplasmic

reticulum, amino sugar and nucleotide sugar metabolism (hypergeometric test,

corrected P value < 0.05). This is consistent with metabolic activation and cell wall

biogenesis (Figure 5).

Figure 5. Functions of genes differentially expressed in R. delemar. Enriched KEGG categories

for the up/down regulated genes over sample comparisons (listed on the X axis). The

enrichment of the category is indicated by the colour bar. White corresponds to no

enrichment, and yellow to red corresponds to the given P value of the enrichment. Data

produced with 3 biological replicates (n=3) for each sample.

WT + M

acrophage vs WT (up)

WT + M

acrophage vs WT (down)

WT + M

acrophage vs Cured (up)

WT + M

acrophage vs Cured (down)

WT vs Cured + M

acrophage (up)

WT vs Cured + M

acrophage (down)

Cured + Macrophage vs Cured (up)

Cured + Macrophage vs Cured (up)

Fatty acid degradationStarch and sucrose metabolismButirosin and neomycin biosynthesisFolate biosynthesisGalactose metabolismTyrosine metabolismArachidonic acid metabolismCarbohydrate digestion and absorptionEndocytosisTerpenoid backbone biosynthesisDNA replicationPyruvate metabolismGlycosphingolipid biosynthesis − ganglio seriesC5−Branched dibasic acid metabolismGlycosaminoglycan degradationTryptophan metabolismChloroalkane and chloroalkene degradationHistidine metabolismPentose and glucuronate interconversionsAmino sugar and nucleotide sugar metabolismCytosolic DNA−sensing pathwayGlycerophospholipid metabolismPlant−pathogen interactionSynthesis and degradation of ketone bodiesProtein processing in endoplasmic reticulumStreptomycin biosynthesisPeroxisomeProximal tubule bicarbonate reclamationMethane metabolismFructose and mannose metabolismArginine and proline metabolismPentose phosphate pathwayalpha−Linolenic acid metabolismMAPK signalling pathwayNOD−like receptor signalling pathwayEther lipid metabolismBiosynthesis of unsaturated fatty acidsLysine degradationAscorbate and aldarate metabolismLimonene and pinene degradationIsoquinoline alkaloid biosynthesisPhenylalanine metabolismTropane, piperidine and pyridine alkaloid biosynthesisButanoate metabolismCyanoamino acid metabolismbeta−Alanine metabolismGlutathione metabolismPPAR signalling pathway

0

0.02

0.04

0.06

0.08

(down)

156

Previously identified duplicate gene pairs of R. delemar (Chapter 3, 4) were analysed for

significant alternate expression (LogFC between genes within a pair > 2), dependent

on endosymbiont status and macrophage exposure. Whilst all R. delemar spores

appeared to alternately regulate oxygen, ROS and superoxide metabolism, only cured

spores exposed to macrophages also differentially regulated glycolysis (Figure 6). This

indicates that although the role of the endosymbiont appears lesser when the overall

transcriptional response is viewed (Figure 1), the presence of the endosymbiont

may aid fungal resistance to external stress by permitting metabolic flexibility, perhaps

through regulation of metabolic pathways. A similar mechanism by which Burkholderia

regulates sexual reproduction in R. microsporus has been observed, showing that

endosymbionts have the ability to regulate host processes (Mondo et al, 2017).

Figure 6. Heatmap displaying the difference in expression (LogFC) between duplicated gene

pairs in the spores of R. delemar, wt (+E) or cured, which have been phagocytosed (+M) or

remain unexposed to macrophages.

157

When comparing transcriptional profiles of wt and cured spores incubated in serum-free

DMEM (sfDMEM) for 3 hours (time matched to phagocytosis assay), very few transcriptional

changes in either species in response to curing were observed. In R. delemar, a single gene,

predicted to be a putative protein phosphatase, was repressed. In R. microsporus , three

genes were induced: an autophagy-related protein, a C2H2 zinc finger transcription factor,

and ribosomal protein L2.

Despite these small changes, loss of the endosymbiont appears to impact the size of

transcriptional responses of both fungal species to macrophages (Figure 3), and Itabangi et al

have shown the importance of the endosymbiont for virulence (Itabangi et al, 2019).

Specifically, an overall increase in the number of fungal genes differentially regulated upon

phagocytosis for both species can be observed. Exposure of wt R. microsporus to

macrophages induced the expression of one gene with no known function and repressed 6

genes. The repressed genes include an autophagy-related protein and a zinc finger

transcription factor, as well as 4 unannotated genes (Figure 3). In contrast, when cured R.

microsporus spores were exposed to macrophages, 277 genes were significantly induced and

82 repressed, compared to unexposed cured spores (Figure 3). Induced genes were enriched

(hypergeometric test, corrected P value < 0.05) for the following GO categories: organelle

organisation, pre-ribosome and ribosome activity, ATPase activity, hydrolase activity,

pyrophosphatase activity, helicase activity, nucleic acid binding, RNA metabolism, nitrogen

metabolism, chromatin silencing. Repressed genes were enriched (hypergeometric test,

corrected P value < 0.05) for the following GO categories: oxidoreductase activity, hydrogen

sulphide metabolism, glycolysis, sulphur metabolism, hexose catabolism, siderophore

158

activity, iron assimilation, nitrogen metabolism, carboxylic acid metabolism. This suggests an

overall failure to properly respond to host stresses such as iron starvation in the absence of

the bacterial endosymbiont.

A similar impact of the endosymbiont was observed for R. delemar. While the overall fungal

response to phagocytosis is characterized by a robust transcriptional response, induced genes

in wt samples (1137 genes, Figure 3) were enriched for KEGG classifications corresponding to:

alanine metabolism, PPAR signalling, aromatic compound biosynthesis and degradation,

lysine metabolism, lipid metabolism, MAPK signalling, sugar metabolism, tyrosine

metabolism, secondary metabolite biosynthesis (Figure 5). Repressed genes in wt samples

(472 genes, Figure 3) were enriched for KEGG classifications corresponding to: carbohydrate

metabolism, secondary metabolite biosynthesis, ketone body processing, protein processes,

MAPK signalling (Figure 5). In contrast, induced genes in cured samples (1285 genes, Figure

3) were enriched for KEGG classifications corresponding to: fatty acid metabolism, DNA

replication, amino acid metabolism, glycan metabolism, pyruvate metabolism and secondary

metabolite processing (Figure 5). Repressed genes in cured samples (878 genes, Figure 3)

were enriched for KEGG classifications corresponding to: sugar metabolism, amino acid

metabolism, lipid metabolism, MAPK signalling, NOD-like receptor signalling. Again, this

suggests that the endosymbiont has an overall suppressive impact on fungal transcription in

response to macrophage challenge.

When comparing the transcriptional responses of ortholog genes shared by R. delemar and

R. microsporus, we see only a small proportion behave similarly (213 genes, detailed

in the online appendix, Ortho_Genes). When phagocytosed, wt spores from both species

upregulate ortholog genes involved in fatty acid

159

catabolism, transcription, regulation via polymerase II, and organelle organization.

Phagocytosed cured spores from both species upregulate ortholog genes involved in RNA

processing, chromosome organization and condensed chromosome pathways. When

unexposed, we see wt spores upregulate ortholog genes involved in translocation, protein

binding, siderophore activity, cobalmin processing, and post-translational protein targeting.

Cured unexposed spores upregulate ortholog genes with roles in siderophore activity

and transferase activity. A list of the 213 orthologs and their predicted functions can

be found in online the appendix (Ortho_Genes). Overall, R. delemar and R. microsporus

both respond transcriptionally to the presence of macrophages, however the size

and composition of this response differs between species.

Due to work which has linked iron scavenging to survival within the phagolysosome

(Andrianaki et al. 2018), expression of genes predicted to be involved in ferrous iron

transport was analysed. There are 12 genes in the R. delemar genome with predicted

ferrous iron roles. While 8 showed no significant change over the tested conditions, 3

(R0G3_006623, R0G3_007727, R0G3_011864) appeared highly expressed in wt and

cured phagocytosed spores, compared to unexposed spores. The last gene, ROG3_009943,

is highly expressed in wt spores unexposed to macrophages. Together, this suggests

there may be condition dependent specialization in the expression of ferrous iron

transport in R. delemar.

160

Figure 7. Single cell plot generated by Loupe Cell Browser (K-means clustering). The 10X

single cell genomics pipeline requires use of the 10X genomics specific software to

visualize single cell data. Unfortunately the software does not provide information on

PCA axis units, although it is likely to represent semantic space.

The Macrophage Response

To investigate the innate immune response when challenged with R. delemar and

R. microsporus, I conducted single cell RNA-Sequencing of J774.A1 murine

macrophages, unexposed and exposed for 3 hours, to the four types of pre-swollen spores.

Transcription of both challenged and unchallenged macrophages displayed

underlying population heterogeneity (Figure 7). The functions of genes highly

expressed (Figure 8) and displaying reduced expressed (Figure 9) within the mixed

clusters span broad categories including metabolic processes, nucleotide processing, cell

cycle processes and stress response pathways. The heterogeneity displayed may be

due to alternate cell cycle states of the macrophages sampled. Synchronisation of the

macrophages prior to infection might reduce the heterogeneity seen here, and allow for

better detection of the transcriptional response to infection, at a single cell level.

161

Figure 8. Functions classifications (GO terms) corresponding to genes which appear highly expressed (Log2FC > 2) within each cluster of single cells (cluster determined with K means clustering). Whilst cluster 3 (carbohydrate metabolism), 4 (binding activity) and 5 (proteolysis) appear functionally distinct, clusters 1 and 2 highly express genes with a range of broad functions, which offer inconclusive results about the state of the macrophages within these clusters.

Figure 9. Functions classifications (GO terms) corresponding to genes which exhibit reduced expression (Log2FC < -2) within each cluster of single cells (cluster determined with K means clustering). None of the clusters appear functionally distinct, there are however functions which appear to be consistently down regulated between clusters, these include: cytokine signalling (cluster 1, 3, 5), chromatin organization (cluster 1, 3, 4), nucleotide metabolism (cluster 1, 2, 4), phosphate metabolism (cluster 1, 2, 4) and response to stress (cluster 4, 5).

162

Due to lack of access to individual single cell data for further autonomous manipulation

(other than in the Loupe cell browser GUI), principal component analysis of the aggregated

transcriptional data was performed. Despite the heterogeneity displayed (Figure 7),

aggregated analysis reveals there is a clear difference in transcription between macrophages

that have and have not been exposed to the fungi, which appears to drive the PCA

clustering (Figure 10). To therefore identify the transcriptional patterns of genes

responding to the spores, the expression of a subset of genes previously identified as

immune response genes (Muñoz et al. 2018) was focused upon for further analysis

(Figure 11).

Figure 10. Principal component analysis of macrophage genes differentially expressed across

all samples. Single cell sequencing was performed on uninfected and infected macrophages.

Transcriptional data from the experiment was analysed with the 10X genomics analysis

pipeline, and aggregated prior to principle component analysis.

−10 −5 0 5 10 15 20

−10

−50

510

PC1 (49.17%)

PC2

(18.

71%

)

S1 S2 S3 S4 S5

R. delemar CuredR. delemar WTR. microsporus CuredR. microsporus WTMacrophage Control

163

Across all exposed conditions, relative to unexposed macrophages, there was a profile

consistent with cytokine activation, response to stimulus, and activation of the NF-Kb

pathway. This was accompanied by repression of CCL5, which is involved in T-cell recruitment

(Figure 11). However, different macrophage profiles can be seen in response to the two fungal

species, and these are further influenced by the presence of the endosymbiont. While the

response to wt R. delemar shows the most deviation from the macrophage-only control,

exposure to cured R. delemar also elicited a strong and distinct macrophage response (Figure

11). Exposure to wt R. delemar elicits increased expression of general markers of activation,

including GTPase activity and MHC class II protein binding (LAG3 repressor of T-cell activation,

H2-M2, IFN-gamma induced IIGP1, MX1, KCTD14, PNP2), growth factor binding, IL1 receptor

agonist activity and endocytosis (SERPINE1, ENG, FGFBP3, GM8898, GCNT2, IL1F6).

Specifically, we observe modest increases in the expression of IFN-γ responsive CXCL10 (3.1

fold) and IRG1/IRG11 (5.9 fold), pro-inflammatory SAA3 (3.5 fold), and ENPP4 (2.8 fold), but

also induction of the M2 polarizing PSTPIP2/21 (6.7 fold), the IL-4 responsive signalling

modulator CISH (5.4 fold), and the vascular damage responsive F3/F31 (5.9 fold) (Martinez et

al. 2013). These latter genes are not as strongly induced during exposure to R. microsporus,

which may reflect the aggressive nature of infection by R. delemar relative to R. microsporus.

In contrast, infection with cured R. delemar showed a decrease in the induction of these M2-

polarisation markers (PSTPIP2, 3.5 fold relative to uninduced). The transcriptional profile is

instead shifted to include increased transcription of genes involved in G protein signalling and

phosphoinositide binding (PDE7B, CCL1, SCARF1, RGS16, PLEKHA4) (Figure 11).

164

A similar change in macrophage polarization was observed during exposure to wt and cured

R. microsporus. For both wt and cured R. microsporus, expression of IFN-γ responsive CXCL10,

SAA3, and ENPP4 was comparable to unexposed macrophages. Compared to R. delemar,

exposure to wt R. microsporus induced a more limited expression of genes with roles in

cytokine activation, ERK1 and ERK2 regulation, and regulation of NF-kB cascade (Figure 11).

There was also a weaker induction of the vascular damage responsive F3/F31 genes, and a

relatively stronger upregulation of the PLA2G16 phospholipase, TRIM30D, SLC1A2 and the

M2 polarizing IL-6. However, other key polarizing genes, particularly PSTPIP2/21, SAA3, and

ENPP4 were only weakly induced. Overall, this profile suggests a weak M1-like activation

consistent with poor phagocytosis and reduced overall antifungal activity that can be

observed in macrophages interacting with endosymbiont-harbouring R.microsporus spores

(Itabangi et al. 2019).

Finally, cured R. microsporus induced a strong pro-inflammatory response, which included

upregulation of CXCL3, the neutrophil chemoattractant, consistent with observations of

differences in phagocyte recruitment in zebrafish upon infection with wt vs. cured spores

(Itabangi et al. 2019). Markers of NF-kB activation were also strongly induced in this

population. Cured R. microsporus also strongly induced the expression of TNFRSF8 (CD30), a

marker of lymphocyte activation occasionally associated with subcutaneous fungal infections.

Overall, this is suggestive of a shift to a more pro-inflammatory profile. Itabangi et al. observe

that cured R. microsporus is more sensitive to phagocyte-mediated killing and phagocyte

recruitment compared to wt (Itabangi et al. 2019), to test whether a more successful response

to the spores could be mounted via the induction of a pro-inflammatory response, further in

vitro experiments were carried out (Figure 12).

165

Figure 11. Clustering of macrophage transcription. Heatmap displaying immune response

genes significantly differentially expressed between macrophage populations. Expression

levels of aggregated data are plotted in Log2 (FDR < 0.001).

Modulating the Infection Outcome

R. delemar exhibits rapid germination followed by hyphal extension (Sephton-Clark et al.

2018). The transcriptional profile observed in macrophages exposed to R. delemar is

consistent with a strong damage response, likely prompted by the germination of R. delemar

spores. I took the following approach to determine whether macrophages would be better

able to control the infection if the fungi were slowed in their developmental progress. The

necessity of genes involved in chitin synthesis and regulation appeared important for both R.

delemar and R. microsporus in response to phagocytosis (Chapter 6). When fungal spores

S5 S1 S3 S2 S4

CCL5

CCL51F3

F31IRG1

IRG11PSTPIP2

PSTPIP21CXCL10

SAA3ENPP4

CISHSERPINE1

ENGFGFBP3

GM8898GCNT2

IL1F6ZFP558

CST7H2−Q6

VCANH2−T24

LY75IL27

AKAP2SLAMF7

H2−AB1AW112010GM5431

CPFNDC7

CCND2IL4I1

AA467197COL4A2

COL27A1EDN1

IFI205IL20RB

TNFRSF8CD247

CCL22AK4

HVCN1IL1B

IL23AAGRN

ATP13A4CX3CL1

HTRA1GM8773

TGM2AI504432

FLT4NOD1

RSAD2PLA2G16

TRIM30DSLC1A2IL6

ADAMTS4TNFSF10

AKR1C12MACC1

BC147527CSF3

SLFN5IL12B

BCL11AHTRA4

ADORA2ATRIM5

KLRK1GBP4

PYHIN1FABP3

PDE7BCCL1

SCARF1RGS16

PLEKHA4LAG3

H2−M2IIGP1

MX1KCTD14

PNP2GSTT1

GPR141MEFV

CD83CD831GM6377

TICAM2

−3

−2

−1

0

1

2

3

4CCL5

F3, IRG

PSTPIP

Glycoprotein, Receptor, G Protein Signaling, Phosphoinositide binding

CXCL10, SAA3, ENPP4

Growth Factor Binding, IL1 receptor agonist, endocytosis, protein binding

Antigen presenting, Endopeptidase inhibitor

Extracellular region, Collagen, Cell Activation, Cell Proliferation, Leukocyte & Lymphocyte activation, Endothelial receptor binding, Interleukin production, Inflammatory response, Sugar binding

TNFRSF8, CDC247, CCL22

Immune response, Cytokine activation, ERK1 & ERK2 regulation, Response to stimulus, Regulation of NF-kappaB cascade

NK cell activation, Interferon-gamma production, leukocyte activation, binding, regulation of T cell activation

GTPase activity, MHC class II protein binding

Regulation of cytokine production, inflammatory response, glutathione transferase

Macrophage control

Macrophage + R. delemar WT

Macrophage + R. microsporus WT

Macrophage + R. delemar cured

Macrophage + R. microsporus cured

S5 S1 S3 S2 S4

CCL5

CCL51F3

F31IRG1

IRG11PSTPIP2

PSTPIP21CXCL10

SAA3ENPP4

CISHSERPINE1

ENGFGFBP3

GM8898GCNT2

IL1F6ZFP558

CST7H2−Q6

VCANH2−T24

LY75IL27

AKAP2SLAMF7

H2−AB1AW112010GM5431

CPFNDC7

CCND2IL4I1

AA467197COL4A2

COL27A1EDN1

IFI205IL20RB

TNFRSF8CD247

CCL22AK4

HVCN1IL1B

IL23AAGRN

ATP13A4CX3CL1

HTRA1GM8773

TGM2AI504432

FLT4NOD1

RSAD2PLA2G16

TRIM30DSLC1A2IL6

ADAMTS4TNFSF10

AKR1C12MACC1

BC147527CSF3

SLFN5IL12B

BCL11AHTRA4

ADORA2ATRIM5

KLRK1GBP4

PYHIN1FABP3

PDE7BCCL1

SCARF1RGS16

PLEKHA4LAG3

H2−M2IIGP1

MX1KCTD14

PNP2GSTT1

GPR141MEFV

CD83CD831GM6377

TICAM2

−3

−2

−1

0

1

2

3

4

166

were pre-treated with the chitin synthesis inhibitor Nikkomycin Z (24 μg/ml) they remained

viable but exhibited reduced swelling. By challenging macrophages with spores pre-treated

with Nikkomycin Z (24 μg/ml), macrophage survival was increased at 7.5 hours post infection

(Figure 12). As the macrophages are better able to control these spores, this suggests that

spores undergoing the initial stages of germination may offer less of a challenge for the

macrophages. This is consistent by data shown by Itabangi et al., who examined macrophage

response to both resting and swelling R. microsporus spores (Itabangi et al. 2019).

The transcriptional data show a strong M2 alternative activation signal during R. delemar-

macrophage interaction, but a weaker M2 polarisation during R. microsporus-macrophage

interaction that was further shifted towards NF-kB-mediated M1 upon endosymbiont cure.

To shift the macrophage polarization towards M1 classical activation, macrophages were pre-

treated with NF-kB activating lipopolysaccharide (LPS). This offered a protective effect upon

Mucorales infection, significantly improved the ability of macrophages to control R.

microsporus. At 7.5 hours post infection, 59.7% of macrophages survived when pre-treated

with LPS, compared to 24.6% without (Figure 12).

167

Figure 12. Macrophage survival following exposure to R. delemar (wt) and R. microsporus

spores (wt). Macrophages +/- LPS pre-treatment were infected with fungal spores

(Multiplicity of infection (MOI) 5:1), pre-swollen in SAB consistent with single cell

experiments (biological n=3). Macrophages were infected with fungal spores that were

pre-treated with +/- Nikkomycin Z (24 μg/ml; biological n=3 for each sample). Macrophage

survival was determined 7.5 hours post infection with time course live cell imaging. Asterisk

denote significant differences between samples (*= p < 0.01), determined with the

Wilcoxon-Mann-Whitney test, corrected for multiplicity with the Bonferroni method.

Macro

phage

Macro

phage +

LPS

Macro

phage +

R. d

elem

ar

Macro

phage +

LPS +

R. dele

mar

Macro

phage +

Nikk

omyc

in +

R. dele

mar

Macro

phage +

R. m

icrosp

orus

Macro

phage +

LPS +

R. micr

osporu

s

Macro

phage +

Nikk

omyc

in +

R. micr

osporu

s0

20

40

60

80

100

Mac

roph

age

Sur

viva

l (%

)

**

*

*

*

168

Conclusions

These results show that the fungal response to innate immune cells differs by species in the

Rhizopodaceae family. Although R. delemar and R. microsporus share a small conserved

response to macrophage exposure, the majority of their response differs. Results show that

the fungal transcriptional response appears largely unperturbed by the presence or lack of

an endosymbiont, in the absence of stress. However, the presence of an endosymbiont

greatly effects the response of the host. Activation of the host and inhibition of spore

germination successfully modulates the infection outcome.

Discussion

Surprisingly, the scale of the fungal response varied appreciably between species. As

previously discussed, this may be an artifact of the differential growth rates these species

display. This variation is also observed in other relatively closely related species; C. albicans

and C. glabrata differ substantially in their responses to the host (Brunke and Hube, 2012).

Unsurprisingly, the macrophage response (Figure 11) reflected in vitro observations; the

more ‘M1-like’ the transcriptional response, the better the macrophages control the spores

in vitro. Unfortunately, the macrophage single cell sequencing approach taken here (10X

genomics single cell) resulted in limited meaningful single cell data. This was due to the

unavailability of single cell data to the user, outside of their specified user pipeline (which

provided inflexible and limited analysis options). To improve on the single cell analysis,

further experiments utilising an alternative system such as Drop-Seq should be carried out.

169

As anticipated, activation of pro-inflammatory pathways increased macrophage survival in

response to the spores. This consolidates several studies which demonstrate improved innate

immune cell response to fungal pathogens when primed (Rogers et al. 2013; Municio et al.

2013; Blasi et al. 1995). In addition, this analysis reveals profound differences in the host

response to two related Rhizopus species. In particular, results show a M2/damage-

associated response during infection with wt R. delemar spores that is shifted towards an M1

protective response upon infection with cured R. microsporus spores. The ability to

germinate prior to phagocyte control also appears key to virulence, as blocking spore

germination with the chitin synthase inhibitor Nikkomycin Z improves macrophage survival,

and highlights the requirement for chitin synthase for spore development in these species.

Further Work

Future work focusing on modulation of the innate immune system in both in vitro and in vivo

models would allow a better understanding of the innate immune response to Mucorales

species. Modulation of pathways which include the genes identified here (Figure 11) with

exogenous cytokines, signalling molecules and inhibitors would allow for further elucidation

of the pathways involved in the macrophage response. Clinical modulation or stimulation of

the immune system could provide protection against infection in high-risk patients. Topical or

systemic germination inhibitors might also be explored as options for a prophylactic

treatment in high risk patients. Antimycin A isomers and derivatives would be good

candidates for this, however the cytotoxicity of Antimycin A itself makes it unsuitable for use

in humans.

170

Chapter 6: Germination Inhibition

This chapter will introduce approaches which are capable of inhibiting and modulating fungal

germination. My results demonstrate several compounds capable of inhibiting germination

of Rhizopus spores. These compounds successfully inhibit germination through chitin

synthase inhibition, electron transport chain inhibition and reactive oxygen species pathway

regulation. Further to this, my results demonstrate inhibition of Rhizopus spore germination

through treatment with natural compounds extracted from plants and lichen. Both

compound screening and target based approaches have yielded compounds capable of

germination inhibition, shedding light on the mechanisms which underpin germination.

171

Manipulation and Inhibition of Germination


Filamentous Fungi” (Sephton-Clark and Voelz 2017), for which I performed the

literature search, wrote the manuscript, completed revisions, and prepared the figures.

Germination is the developmental process underlying initiation of many

fungal diseases. Thus, strategies that inhibit germination have been of much

interest as a means to treat both human and plant fungal infections. Inhibition of

Mucorales spore germination by the host is likely key to preventing infection in

healthy individuals, however germination inhibition often fails in

immunocompromised infection models (Voelz et al. 2015; Rosowski et al. 2018). The

process of germination is therefore an attractive therapeutic target, which has been

explored for Aspergillus species previously. Germination inhibition may be reversible, as

seen for multiple Aspergillus species when inhibited (Nogueira et al. 2019). There are

multiple fungistatic and fungicidal drugs currently available to treat fungal

infections, however most remain innefective against Rhizopus species. Given

the impact of Rhizopus germination on the host, and limited treatments

for mucormycosis, I attempted to identify germination inhibitors.

Manipulation of physical parameters is a common strategy employed to ensure food

safety. Decreasing water potential can aid with fungicidal action, as the germination of

Aspergillus niger species is inhibited by reduced water availability (Long, 2017; Ni, 2005).

Lowering temperature is also a common method for inhibiting germination of food spoiling

fungi (Eckert, 1967; Barth, 2009). The common food spoilage agent Rhizopus delemar will

not germinate below 5 °C (Eckert, 1988), whilst the pathogen M. gypseum will

only tolerate temperatures over 35 °C (Leighton and Stock 1969) demonstrating

temperature is clearly a strong mechanism for regulating germination.

Non-steroidal anti-inflammatory drugs (NSAIDs) such as Ibuprofen, have been shown to

inhibit the germination of several fungal species capable of causing respiratory diseases,

including Aspergillus niger (Dalmont, 2017). The use of aerosolized NSAIDs as a

preventative measure has been suggested as a way to tackle these common afflictions,

however one should be careful to note the appropriate controls for this study are absent,

so conclusions which can be drawn remain limited. If effective, they could be especially

useful in damp 172 housing where pathogens such as Aspergillus niger thrive (Dalmont,

2017).

172

Furthermore, statins have been shown to decrease germination of the human

pathogen Rhizopus oryzae, as well as increasing susceptibility to oxidative stress (Bellanger

et al. 2016).

The topical administration of cheap and accessible substances such as acetic acid to open

wounds has been suggested as another treatment which is effective due to its inhibition of

germination (Trzaska et al. 2015). Acetic acid has been shown to inhibit germination of

mucormycosis causing species. The administration of acetic acid might provide effective

means for preventing this hard-to-treat invasive disease in patients with deep tissue wounds

which may have been exposed to contaminated soils (e.g. blast wounds) (Trzaska et al.

2015). Furthermore, the germination of several pathogenic fungi can be inhibited by

substances such as ethanol (Plumridge et al. 2004; Trzaska et al. 2015; Dao & Dantigny

2011).

Nanoparticles, an excellent alternative to traditional chemical treatments, are capable of

inhibiting germination in the tobacco leaf pathogen P. tabacina. Administration of such Zinc

nanoparticles to tobacco leaves has been suggested as a cheap and efficient way to reduce

pathogenesis and crop losses, as the nanoparticles show effectivity at very low doses

(Wagner et al. 2016).

In addition, a range of biological strategies has been investigated. Several biomolecules can

be used effectively to inhibit the germination of fungi. Chitosan derivatives which

incorporate a pyridine were found to exhibit inhibition of germination on the plant

pathogen B. cinerea, posing yet another method for the treatment of food or plants with a

safe molecule, which would decrease plant disease by fungal infection (Jia et al. 2016).

Similarly, the inhibition of germination of plant pathogens through biocontrol is a currently

expanding field. Colonising crops with plant ‘safe’ bacteria or fungi, which produce

molecules damaging to plant pathogens, can effectively control plant disease.

173

For example, organic compounds released by Streptomyces albulus have been shown to be

capable of inhibiting germination of the plant pathogen Fusarium oxysporum (Wu, 2015).

Pseudomonas antimicrobica produces a molecule capable of decreasing germination rates

of the prolific fungal plant pathogen B. cinerea (Wu, 2015; Walker, 2001).

Whilst many of these recently suggested approaches have great potential to offer new

methods in combating fungal growth and disease, our current understanding of the

underlying mechanisms of inhibition is limited and thus requires further study.

174

Results

Results have been previously published or adapted from the following articles: “Pathways of

Pathogenicity: Transcriptional Stages of Germination in the Fatal Fungal Pathogen Rhizopus


Mucorales and their endosymbionts: a polymicrobial pas de trois” (Sephton-clark et al. 2019).

For both I conceived, designed and performed the experiments, collected the data, performed


figures.

Germination Inhibitors Identified Through Transcriptional Studies

Transcriptional and phenotypic results identified cell wall remodelling, respiration, REDOX

and stress response to be key pathways differentially regulated during the transition from

resting spore to swelling spore. To determine whether modulation of these pathways would

lead to inhibition of germination, spores were treated with a chitin synthase inhibitor

(Nikkomycin Z), a cytochrome c reductase inhibitor (Antimycin A) and exogenous reactive

oxygen species (ROS) (Hydrogen peroxide).

An increase in intracellular ROS can be observed in R. delemar over the course of germination

(Figure 1a). I investigated the significance of ROS detoxification during germination by testing

for resistance to exogenous (H2O2) and endogenous (mitochondrial-derived) ROS (Figure 1b).

Treatment with 5 mM but not 1 mM H2O2 was sufficient to inhibit spore germination. In

contrast, spores were highly sensitive to treatment with 1.5 or 10nM antimycin A. Inhibition

of the mitochondrial cytochrome c reductase leads to an accumulation of superoxide radicals

175

within the cell. Furthermore, antimycin A may exert a dual effect, as the expression of storage

molecule transcripts appears high in both ungerminated spores and the hyphal form. High

sensitivity to inhibition of oxidative phosphorylation with antimycin A is consistent with

reports that utilization of these storage molecules as energy reserves is important for the

initiation and maintenance of growth (Elbein 1974; Novodvorska et al. 2016; Svanström et al.

2014).

When spores of R. delemar and R. microsporus were treated with the chitin synthesis inhibitor

Nikkomycin Z (24-120 μg/ml), they failed to germinate (Figure 1c) and displayed less

chitin/chitosan in their outer cell wall (Figure 1c: R. delemar 120 μg/ml, R. microsporus 24-

120 μg/ml). At Nikkomycin Z concentrations lower than 24 μg/ml, we see the spores are able

to swell, however development appears halted after swelling.

176

Figure 1. Targeted germination inhibition of Rhizopus species a) Spores germinated for 0, 3,

6, 12, and 24 h, stained to show ROS with carboxy-H2DCFDA. b) Germination is inhibited by 5

mM hydrogen peroxide and over 1.5 nM antimycin A, as determined by live-cell imaging, after

5 h of germination in SAB. The hydrogen peroxide control consists of an equivalent volume of

H2O, and the antimycin A control consists of an equivalent volume of 100% ethanol. c) Chitin

synthase inhibition of R. delemar and R. microsporus germination. R. delemar and R.

microsporus treated with Nikkomycin Z in SAB, labels indicate concentration of inhibitor.

Fluorescence indicates calcofluor white staining, and thus the availability of chitin/chitosan in

the cell wall.

0 3 6 12 24A

B

Media

Hydro

genPero

xide 1m

M

Hydro

genPero

xide 5m

M

Antimyc

inA

1.5nM

Antimyc

inA

10nM

Hydro

genPero

xide Contro

l

Antimyc

inA

Control

0

20

40

60

80

100

% G

erm

inat

ion

Percent Germination (5 hr)

CFW

FITC

ROS

0 3 6 12 24A

B

Media

Hydro

genPero

xide 1m

M

Hydro

genPero

xide 5m

M

Antimyc

inA

1.5nM

Antimyc

inA

10nM

Hydro

genPero

xide Contro

l

Antimyc

inA

Control

0

20

40

60

80

100

% G

erm

inat

ion


CFW

FITC

ROS

R. delemar R. microsporus

SAB Control

24 µg/ml Nikkomycin Z

Treatment

120 µg/ml Nikkomycin Z

Treatment

0 3 6 12 24A

B

Media

Hydro

gen Pero

xide 1

mM

Hydro

gen Pero

xide 5

mM

Antimyc

in A 1.5n

M

Antimyc

in A 10nM

Hydro

gen Pero

xide C

ontrol

Antimyc

in A Contro

l0

20

40

60

80

100

% G

erm

inat

ion


CFW

FITC

ROS

C

177

A screen identified compounds from a natural compound library, provided by

Strathclyde University, capable of inhibiting germination of Mucorales species. The

candidate identified to inhibit germination, A10, is an extract from either plant, lichen or

fungi. A10 inhibits the metabolic activity of R. microsporus in a dose dependent manner

(Figure 2), with high doses inhibiting as potently as the known inhibitor acetic acid (Trzaska

et al. 2015). The flavonoid chrysin, a known antifungal (Shimura et al. 2007), was

identified from a list of compounds (provided by Strathclyde University) as a potential

active molecule within A10.

Germination Inhibitors Identified Through Natural Compound Screening

178

Figure 2

Metabolic activity and Biomass of Rhizopus microsporus spores when treated with increasing

dosages of a plant extract supplied by Strathclyde, compared to acetic acid (AA) and DMSO

controls. Metabolic activity correlates positively with readings at OD 450nm, Biomass to OD

600nm.

0

0.2

0.4

0.6

0.8

1

1.2

1.4

0 0.1 1 10 25 50 75 100 AA DMSO

OD (

600n

m)

Concentration (ug/ml)

Biomass at 80 minutes

00.51

1.52

2.53

3.54

4.55

0 0.1 1 10 25 50 75 100 AA DMSO

OD (

450n

m)

Concentration (µg/ml)

Metabolic Activity measured at 80 minutes

179

Discussion

The inhibitors identified in this work highlight the roles of chitin synthase and ROS signalling

in regulating germination in Rhizopus species. Hydrogen peroxide has the potential to be

used as a topical prophylactic treatment for high-risk patients, as solutions of 3-6% H2O2

(3% = 0.88M) are well tolerated by the skin (Mahran et al. 2019). H2O2 appears fungicidal to

Rhizopus species at 5mM, a concentration which is unlikely to cause skin irritation. Multiple

pharmaceutical companies have attempted to develop Nikkomycin Z for clinical use as an

antifungal (Galgiani, 2016), however it has not yet made it to market as an approved

antifungal treatment. Nikkomycin Z serves as a good candidate for the treatment of

mucormycosis, and should be explored further as a treatment option with in vivo models.

The potential for germination inhibition with natural compounds should be further explored

with high resolution mass spectrometry of the fungicidal A10, to determine the structures of

compounds within A10. A germination screen with purified forms of these compounds

would offer candidates for testing with mammalian cell lines, to determine toxicity and drug

development suitability.

180

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Appendix

ComPfam

R. delemar R. microsporus q-value

PF01498 873 1 6.96E-127PF07714 418 0 4.69E-60PF00385 499 8 7.87E-60PF13358 532 32 3.27E-42PF03372 373 10 1.17E-39PF08238 284 2 1.47E-36PF13551 258 3 1.62E-31PF00400 429 31 1.59E-30PF00078 330 14 2.18E-30PF13893 293 9 7.33E-30PF07282 10 78 1.09E-28PF00077 177 0 1.58E-24PF13516 194 2 7.20E-24PF13606 179 1 4.45E-23PF12895 164 0 1.15E-22PF13894 374 36 1.49E-21PF08284 140 1 2.36E-17PF07653 153 3 9.95E-17PF00271 124 1 4.77E-15PF12894 2 33 1.74E-13PF13833 94 0 3.81E-12PF02992 126 4 3.94E-12PF13191 4 33 8.65E-12PF09668 99 1 1.51E-11PF13857 99 1 1.51E-11PF14259 87 0 3.94E-11PF00096 61 85 6.25E-11PF03732 129 6 6.41E-11PF07690 151 10 7.81E-11PF13041 0 23 8.70E-11PF13812 92 1 1.45E-10PF12937 42 69 1.56E-10PF13504 80 0 2.17E-10PF12762 95 2 6.02E-10PF13637 120 6 7.56E-10PF00153 177 17 8.42E-10PF00512 76 0 8.48E-10PF08662 93 2 8.84E-10PF04670 89 2 3.54E-09PF01209 82 1 3.55E-09PF00025 115 6 3.82E-09PF13374 70 0 5.60E-09PF13650 86 2 8.34E-09PF00665 87 2 8.97E-09PF05148 77 1 1.28E-08PF08659 66 0 2.28E-08PF12773 0 18 2.66E-08PF03184 64 0 3.66E-08PF09011 65 0 3.66E-08PF00071 18 40 4.49E-08

211

RHIMIDRAFT_288130RHIMIDRAFT_288174RHIMIDRAFT_307408RHIMIDRAFT_79038RHIMIDRAFT_267844RHIMIDRAFT_221939RHIMIDRAFT_248707RHIMIDRAFT_203580RHIMIDRAFT_270714RHIMIDRAFT_283813RHIMIDRAFT_195307RHIMIDRAFT_307836RHIMIDRAFT_290452RHIMIDRAFT_232533RHIMIDRAFT_253108RHIMIDRAFT_257184RHIMIDRAFT_245053RHIMIDRAFT_245669RHIMIDRAFT_87630RHIMIDRAFT_314936RHIMIDRAFT_240622RHIMIDRAFT_234322RHIMIDRAFT_138553RHIMIDRAFT_242387RHIMIDRAFT_196349RHIMIDRAFT_99785RHIMIDRAFT_252937RHIMIDRAFT_198874RHIMIDRAFT_138931RHIMIDRAFT_271682RHIMIDRAFT_313047RHIMIDRAFT_294525RHIMIDRAFT_272110RHIMIDRAFT_252367RHIMIDRAFT_96114RHIMIDRAFT_251305RHIMIDRAFT_239731RHIMIDRAFT_281133RHIMIDRAFT_289002RHIMIDRAFT_197836

R. microsporus genes significantly (FDR<0.001) differentially expressed (40 genes). Thepredicted functions for each gene can be found in the GO file, within the online appendix(R_micro_GO).

212

213

hypothetical protein HMPREF1544_02453 [Mucor circinelloides f. circinelloides 1006PhL]

hypothetical protein A0J61_00230 [Choanephora cucurbitarum]

cytochrome P450 [Syncephalastrum racemosum]


cytochrome p450 [Lichtheimia corymbifera JMRC:FSU:9682]

hypothetical protein LRAMOSA00373 [Lichtheimia ramosa]



cytochrome P450 CYP5313 [Mucor circinelloides f. lusitanicus CBS 277.49]



P450 monooxygenase [Mucor ambiguus]



cytochrome p450 monooxygenase [Mucor ambiguus]


cytochrome P450 CYP5313 [Phycomyces blakesleeanus NRRL 1555(-)]






p450 monooxygenase [Lichtheimia corymbifera JMRC:FSU:9682]


hypothetical protein BCR43DRAFT_510841 [Syncephalastrum racemosum]




hypothetical protein [Absidia glauca]

cytochrome P450 [Absidia repens]


cytochrome P450 [Hesseltinella vesiculosa]




lanosterol 14-alpha demethylase [Hesseltinella vesiculosa]

RecName: Full=Lanosterol 14-alpha demethylase; AltName: Full=CYPLI; AltName: Full=Cytochrome P450 51; AltName: Full=Cytochrome P450-14DM; AltName: Full=Cytochrome P450-LIA1; AltName: Full...


hypothetical protein [Parasitella parasitica]

hypothetical protein MUCCIDRAFT_110910 [Mucor circinelloides f. lusitanicus CBS 277.49]

lanosterol 14-alpha demethylase [Mucor circinelloides f. circinelloides 1006PhL]

cytochrome P450 [Mucor ambiguus]




cytochrome p450 superfamily protein [Mucor ambiguus]



CYP5312 protein [Mucor circinelloides f. lusitanicus CBS 277.49]

cytochrome p450 4v2 [Lichtheimia corymbifera JMRC:FSU:9682]

cytochrome p450 monooxygenase [Lichtheimia corymbifera JMRC:FSU:9682]


cytochrome p450 monooxygenase [Lichtheimia corymbifera JMRC:FSU:9682]



cytochrome p450 704c1-like [Lichtheimia corymbifera JMRC:FSU:9682]







hypothetical protein RMATCC62417_06674 [Rhizopus microsporus]


cytochrome P450 [Rhizopus microsporus var. microsporus]

hypothetical protein RMCBS344292_04064 [Rhizopus microsporus]

cytochrome P450 [Rhizopus microsporus]

BcABA1, cytochrome P450 monooxygenase [Botrytis cinerea T4]














BactB [Mucor circinelloides f. circinelloides]



CYP5206 protein [Phycomyces blakesleeanus NRRL 1555(-)]


hypothetical protein RO3G_16665 [Rhizopus delemar RA 99-880]








0.3

BcABA1 Homolgy Tree

214



















cytochrome P450 704C1-like [Mucor ambiguus]













cytochrome p450 704c1-like [Lichtheimia corymbifera JMRC:FSU:9682]

































CYP5205 protein [Phycomyces blakesleeanus NRRL 1555(-)]





BcABA2, cytochrome P450 monooxygenase [Botrytis cinerea T4]










cytochrome p450 monooxygenase [Mucor ambiguus]




P450 monooxygenase [Mucor ambiguus]


















0.3BcABA2 Homolgy Tree 215

NAD-binding protein [Absidia repens]


Peroxisomal 2,4-dienoyl-CoA reductase SPS19 [Choanephora cucurbitarum]

Putative 2,4-dienoyl-CoA reductase (NADPH2) [Rhizopus microsporus]



peroxisomal 2,4-dienoyl-CoA reductase [Hesseltinella vesiculosa]

2,4-dienoyl-CoA reductase [Absidia repens]



-dienoyl-reductase [Lichtheimia corymbifera JMRC:FSU:9682]

NAD(P)-binding protein [Hesseltinella vesiculosa]



carbonyl reductase family member 4-like protein [Syncephalastrum racemosum]




phospholipid-transporting ATPase [Mucor ambiguus]



3-oxoacyl-reductase FabG-like protein [Absidia repens]

3-oxoacyl-reductase [Rhizopus microsporus]




3-oxoacyl-(acyl-carrier-protein) reductase [Lichtheimia corymbifera JMRC:FSU:9682]

3-ketoacyl-(acyl-carrier-protein) reductase [Lichtheimia corymbifera JMRC:FSU:9682]

BcABA4 [Botrytis cinerea T4]


hypothetical protein BCR42DRAFT_446447 [Absidia repens]


Putative Glucose 1-dehydrogenase [Rhizopus microsporus]

hypothetical protein PHYBLDRAFT_128144 [Phycomyces blakesleeanus NRRL 1555(-)]

3-oxoacyl-[acyl-carrier-protein] reductase FabG [Choanephora cucurbitarum]

3-hydroxyacyl-CoA-dehydrogenase, mitochondrial [Mucor ambiguus]

glucose 1-dehydrogenase [Mucor circinelloides f. circinelloides 1006PhL]




Putative Glucose 1-dehydrogenase [Lichtheimia ramosa]

short-chain dehydrogenase [Lichtheimia corymbifera JMRC:FSU:9682]




3-oxoacyl-[acyl-carrier-protein] reductase FabG [Choanephora cucurbitarum]



NAD(P)-binding protein [Mucor ambiguus]

3-oxoacyl-[acyl-carrier protein] reductase [Mucor circinelloides f. circinelloides 1006PhL]



Putative 3-oxoacyl-[acyl-carrier protein] reductase [Rhizopus microsporus]

NAD(P)-binding protein [Rhizopus microsporus]

NAD(P)-binding protein [Rhizopus microsporus var. microsporus]





sex determination protein tasselseed-2 [Lichtheimia corymbifera JMRC:FSU:9682]

3-oxoacyl-(acyl-carrier-protein) reductase [Mucor ambiguus]















Sorbose reductase SOU1 [Choanephora cucurbitarum]


L-xylulose reductase [Rhizomucor pusillus]



3-oxoacyl-ACP reductase [Mucor ambiguus]



NAD(P)-binding protein [Rhizopus microsporus]


NAD(P)-binding protein [Rhizopus microsporus var. microsporus]






short-chain dehydrogenase reductase sdr [Lichtheimia corymbifera JMRC:FSU:9682]









TerpG [Mucor circinelloides f. circinelloides]0.2BcABA4 Homology Tree 216



hypothetical protein BCV71DRAFT_267961 [Rhizopus microsporus]



Putative STE/STE20/PAKA protein kinase [Rhizopus microsporus]



Pkinase-domain-containing protein [Rhizopus microsporus]

Pkinase-domain-containing protein [Rhizopus microsporus var. microsporus]



hypothetical protein BCV72DRAFT_71979 [Rhizopus microsporus var. microsporus]





TPR-like protein [Rhizopus microsporus var. microsporus]






UPF0014-domain-containing protein [Rhizopus microsporus var. microsporus]









0.3

DELLA

Dell Homology Tree 217













GLP1 GID1-like protein [Physcomitrella patens]






alpha/beta-hydrolase [Rhizopus microsporus var. microsporus]



alpha/beta-hydrolase [Rhizopus microsporus]





hypothetical protein RMCBS344292_07649 [Rhizopus microsporus]0.6

GLP1 Homolgy Tree

218























0.5

GLP2 Homology Tree

219










hypothetical protein BCV72DRAFT_227955 [Rhizopus microsporus var. microspo...



hypothetical protein BCV71DRAFT_82860 [Rhizopus microsporus]0.5

Glp4 Homology Tree

220

Understanding Germination and Pathogenicity in ... - CORE

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