Nicotinic Receptors and Anthelmintic Resistance Richard J. Martin, Adrian J. Wolstenholme, S. M. Williamson & Alan P. Robertson Department of Biomedical Sciences, Iowa State University, Ames, Iowa USA & Dept of Infectious Diseases, University of Georgia, Athens, Georgia
Nicotinic Receptors and Anthelmintic Resistance. Richard J. Martin, Adrian J. Wolstenholme, S. M. Williamson & Alan P. Robertson Department of Biomedical Sciences, Iowa State University, Ames, Iowa USA & Dept of Infectious Diseases, University of Georgia, Athens, Georgia. - PowerPoint PPT Presentation
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Nicotinic Receptors and Anthelmintic ResistanceRichard J. Martin, Adrian J. Wolstenholme, S. M. Williamson & Alan P. RobertsonDepartment of Biomedical Sciences, Iowa State University, Ames, Iowa USA & Dept of Infectious Diseases, University of Georgia, Athens, Georgia
Monepantel resistance: Hco-mptl-1; Hco-des -2H; Hco-deg-3H; Rufener et al.,
Monepantel resistance: Hco-mptl-1, some lack splice acceptor (TTTCAG)
Molecular detection of resistance: levamisole & monepantel
• Kopp et al., Did not find specific SNPs associated with resistance
• E153 & Q57 not associated with pyrantel resistance• Expression levels of UNC-38, UNC-29 and UNC-63 are
reduced in pyrantel resistance • Rufener et al., Hco-mptl-1 & Hco-des-2H, 1. a panel of mutations (null mutants) including deletions
at intron-exon boundaries giving mis-spliced transients & premature stop codons2. Altered expression levels of Hco-mptl-1 & Hco-des-2H and & Hco-deg-3H
rNAInner nuclear
membrane
Putative L-type receptor subunits:
UNC-38, UNC-29, UNC-63, LEV-1, ACR-13LEV-10
NRA-1
SOC-1 TPA-1
TAX-6
UNC-22
LEV-11
Muscle contraction
UNC-50 RIC-3
Translation
UNC-74
Processing & assembly
Ca CaER
UNC-68
C. elegans proteins involved in levamisole resistance
Resistance may be due to a panel of functional null mutant genes with deletions and insertions and reduced expression of the target receptor genes + other sites!
Acknowledgments• Alan Robertson• Sally Williamson• Sreekanth Puttachary• Sam Buxton• Cheryl Clark• Adrian Wolstenholme• Steve Koppe• Andrew Kotze• Supported by NIH: R01 R 01 AI 047194