© Forensic Science Service Ltd. 2010. All rights reserved. New DNA developments better, faster and cheaper Martin Bill, R&D Forensic Science Service Ltd SPSA / SIPR conference 14 th & 15 th September
Mar 31, 2015
© Forensic Science Service Ltd. 2010. All rights reserved.
New DNA developmentsbetter, faster and cheaper
Martin Bill, R&DForensic Science Service Ltd
SPSA / SIPR conference14th & 15th September
© Forensic Science Service Ltd. 2010. All rights reserved.
Agenda
1. Better – new multiplexes2. Faster – Custody suite DNA testing3. Cheaper – DNA INSIGHT
© Forensic Science Service Ltd. 2010. All rights reserved.
Better – new multiplexes
Assessing the performance of the new miniSTR chemistries
© Forensic Science Service Ltd. 2010. All rights reserved.
ENFSI RequirementRobust multiplexes, inc. Mini STRs• Fifteen STR loci
– Ten SGM Plus® loci, FGA, TH01, VWA, D3S1358, D8S1179, D18S51, D21S11, D2S1338, D16S539, D19S433
– Additional 5 loci D1S1656, D2S441, D10S1248, D12S391, D22S1045
– Amelogenin
• ENFSI DNAWG December 2009– Expansion of ESS to include additional 5
loci.
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Strategic multiplexes
• Two different approaches– Make SGM Plus ® Markers “Standard”– Make SGM Plus ® Markers “Mini”
Resp
onse
Size /bp
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Strategic multiplexing
• Choice of PowerPlex® multiplexes• ESX-16 & ESX-17 – Standard size
“SGMPlus®” loci• ESI-16 & ESI-17 – “Mini” SGMPlus® loci• Optimised for 500pg DNA and 30
cycles
• Applied Biosystems NGM• BioType Mentype® ESSplex
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ESX
D2
S1
33
8
D1
6S5
39
D1
S1
65
6
D1
0S1
24
8
D1
9S4
33
D2
S4
41
D1
2S3
91
D2
2S1
04
5
vW
A
D8
S1
17
9
FGA
SE3
3
Am
el
D3
S1
35
8
D1
8S5
1
D2
1S1
1
TH
01
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ESI
Am
el
D3
S1
35
8
D1
9S4
33
D2
S1
33
8
D2
2S1
04
5
D1
6S5
39
D1
8S5
1
D1
S1
65
6
D1
0S1
24
8
D2
S4
41
D8
S1
17
9
FGA
SE3
3
vW
A
D2
1S1
1
D1
2S3
91
TH
01
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Evaluation of Performance
SensitivityInhibitorsDegraded samplesConcordance
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Sensitivity
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Sensitivity
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Sensitivity
DNA Template (pg)
1 locus
10 loci
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Working Range
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Inhibitors
Humic AcidIndigoHaematin
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Humic Acid
Humic Acid
0
20
40
60
80
100
120
0 10ng/ul 20ng/ul 120ng/ul 240ng/ul
% p
rofil
e
SGM+
Humic Acid
0
20
40
60
80
100
120
0 10ng/ul 20ng/ul 120ng/ul 240ng/ul
% p
rofi
le SGM+
MiniFiler
Humic Acid
0
20
40
60
80
100
120
0 10ng/ul 20ng/ul 120ng/ul 240ng/ul
% p
rofi
le SGM+
MiniFiler
ESX-16
Humic Acid
0
20
40
60
80
100
120
0 10ng/ul 20ng/ul 120ng/ul 240ng/ul
% p
rofi
le
SGM+
MiniFiler
ESX 16
ESI-16
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Indigo
Indigo
0
20
40
60
80
100
120
0uM 75uM 150uM 300uM 600uM 1200uM
% p
rofi
le
SGM+
Indigo
0
20
40
60
80
100
120
0uM 75uM 150uM 300uM 600uM 1200uM
% p
rofi
le
SGM+
MiniFiler
Indigo
0
20
40
60
80
100
120
0uM 75uM 150uM 300uM 600uM 1200uM
% p
rofi
le SGM+
MiniFiler
ESX-16
Indigo
0
20
40
60
80
100
120
0uM 75uM 150uM 300uM 600uM 1200uM
% p
rofi
le
SGM+
MiniFiler
ESX -16
ESI-16
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Haematin
Haematin
0
20
40
60
80
100
120
0 30uM 60uM 120uM 240uM 360uM 480uM 600uM
% p
rofi
le
SGM+
Haematin
0
20
40
60
80
100
120
0 30uM 60uM 120uM 240uM 360uM 480uM 600uM
% p
rofi
le
SGM+
MiniFiler
Haematin
0
20
40
60
80
100
120
0 30uM 60uM 120uM 240uM 360uM 480uM 600uM
% p
rofil
e
SGM+
MiniFiler
ESX-16
ESI-16
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Degraded DNA
ESX vs ESI vs SGMPlus®
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Analysis of degraded DNA
• SGMPlus® with degraded DNA
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Degraded DNA
• ESX-16 with degraded DNA
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Degraded DNA • ESI-16 with degraded DNA
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Degraded DNA
Sample ESX ESI SGM+
16 loci
11 loci
16 loci
11 loci 11 loci
Degraded 56% 38% 63% 86% 33%
FSS UV1 38% 27% 34% 50% 0%
FSS UV2 16% 9% 28% 41% ND
ENZ 10’ 65% 64% 65% 86% 59%
ENZ 15’ 42% 36% 58% 77% 36%
UV sem ND ND 100% 100% 76%
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Degradation
Amp of SGMPlus® Loci with degraded DNA
0
20
40
60
80
100
120
Deg FSS UV1 FSS UV2 Enz 10 Enz 15 Control
Sample
% p
rofi
le SGM+
ESX-16
ESI-16
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Concordance
NISTFSS
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NIST Concordance with Identifiler®
1461 samples • ESX-16
– 4 loci discordant – 99.98% concordance
• ESI-16– 3 loci discordant – 99.98% concordant
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FSS Concordance with SGMPlus®
Number of loci
compared
Number of concordant
loci
Concordance (%)
ESX 16 3500 3498 99.94
ESI 16 3500 3499 99.97
Non-concordant alleles currently being sequenced
~1 in 200 profiles non-concordant
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Summary
• Promega ES multiplexes– Sensitive– Robust to inhibitors– ESI “SGMPlus” loci very robust with
degraded DNA– High level of concordance with NIST
samples
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Next steps:
• For new multiplexes meeting the ENFSI requirement:– Gain acceptance to NDNAD – Concordance
• (ESX vs ESI vs SGMPlus® vs NGM vs ESSplex)
– Frequency databases– Check for independence (product rule)
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Development of a forensically integrated DNA analysis system.
Faster - Custody suite DNA testing
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Introduction
• What is the aim?• What have we accomplished• What will we achieve in the future
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Suspect Arrest
DNA sample taken
Submission process
Submission process
DNA lab
Profile interp
DNA loaded to NDNAD
Current Process
Suspect Released
6-7 h
Match
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Requirement
• Environment– deployment
• Operator– Skill – Training
• Outcome– DNA profile loaded
to the NDNAD– Match reported in
Real Time
• Robust• Simple User
Interface• Automated
– Chemistry– Analysis– Database search
• 2h turn round• Evidential quality
Eliminate submission by processing at POC
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What we’ve accomplished
4h process
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How does it work?
• Chambers • Channels • Pumps • Valves• Vents• ECB
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PCR Chamber
Direct to
µCE
Elute
Waste
V
VV
V
V
V
V V
V
VV
Wash
Magnet
ArchiveDenature
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Micro Capillary Electrophoresis
• 140-mm glass chip
• PVP/HEC polymer 200 V/cm
• Detection by LIF λex 491 nm
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Profile from fully integrated run
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Ladders
TH01
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What we will achieve in the future
• Single cartridge– Plastic CE
• Reduce time to <2h Sample to match
• Multiple samples– Maintain sample integrity
• Casework samples
• Integrated lysis vial
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Review
• Simple set up • Self contained cartridge • Minimised opportunity for
contamination; batch control• Full 16-plex DNA profiles with no
manual intervention• Identified requirement for further
work (in progress)• Software/database solutions
essential for benefit realisation
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Improved DNA interpretation
Cheaper – FSS DNA INSIGHT & DNAboost
© Forensic Science Service Ltd. 2010. All rights reserved.
24
26
16
20
How does DNA interpretation work and why is it suboptimal?
DNA is visualised as a signal referred to as an EPG.
The role of the scientist is to translate the signal into a simple set of paired numbers that define the DNA profile. These numbers are then compared between profiles in a case (suspect to crimestain) or through the National DNA Database.
Issue 1: Complex data are impossible to convert into a simple set of paired numbers. ?
Issue 2: A high proportion of reporting officer interpretation work is performed manually.
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Where does DNAboost fit into all this?
DNAboost, in part, addresses Issue 1: “Complex data are impossible to convert into a simple set of paired numbers” by a simple improvement to the database design.
15 17 15 18 17 18 15 15 17 17 18 18
Issue 2: “A high proportion of reporting officer interpretation work is performed manually” remains largely unimproved and has opportunities for improvements in efficiency, response time, effectiveness and quality.
DNAboost was always intended to be a development milestone towards improved coding, searching and matching.
DNAboost improves the search and match rate for DNA intelligence and demonstrates that improved encoding of data is a key way of improving performance.
© Forensic Science Service Ltd. 2010. All rights reserved.
How could DNA interpretation be further improved?The current approach always discards useful information that may be required for case assessment, intelligence or troubleshooting.
DBNational DNA Database or interp process
18, 16, 11
Lost information.
Next GenerationInterpretation
The answer is to develop a new interpretation approach that always retains and uses all the useful information. This requires ‘whole EPG interpretation’.
Improved capacity& cost effectiveness
Needs manual, paper review later in the process.
Use all the information in a new continuous model
3 pieces of informatio
n.
~80,000 pieces of
information.
Manual ‘best guess’
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Design and deployment of the new interpretation model
Analyst Reporting Officer
Interprets batches of DNA data to confirm validity.
– Software-based.– Partially automated.– Rule-based &
objective
Unprocessed digital data Valid digital
data
Valid paper data Expertopinion
Interprets cases of DNA data to form opinion.
– Paper-based.– (Very) manual.– Guideline-based and
artisan(?)
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Analyst Reporting Officer
– Software to interpret DNA data
Settings server
FSS DNA
INSIGHT
FSS DNA
INSIGHT
APB
Data server
– Server to regularise and disseminate DNA data
– Server to control settings and administration
– Science, publication, validation, process, training and support
FSS DNA INSIGHT design
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Increased capacity
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Good examples of forensic science getting better, faster and cheaper…
… in reality they all add value in a number of areas
© Forensic Science Service Ltd. 2010. All rights reserved.
Better, faster, cheaper
• The new chemistries may increase timeliness through higher first pass success rates with a reduced requirement for specialist methods like LCN
• Custody suite testing may reduce total forensic supply chain costs.
• DNA INSIGHT may increase success rates through the improved interpretation models.
© Forensic Science Service Ltd. 2010. All rights reserved.
Thanks for listening
Martin Bill, R&DForensic Science Service Ltd
SPSA / SIPR conference14th & 15th September