Adaptive evolution in the SRZ chemoreceptor families of Caenorhabditis elegans and Caenorhabditis briggsae

James H Thomas; Joanna L Kelley; Hugh M Robertson; Kim Ly; Willie J Swanson

doi:10.1073/pnas.0406469102

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Adaptive evolution in the SRZ chemoreceptor families of Caenorhabditis elegans and Caenorhabditis briggsae

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Adaptive evolution in the SRZ chemoreceptor families of Caenorhabditis elegans and Caenorhabditis briggsae

James H Thomas, Joanna L Kelley, Hugh M Robertson, Kim Ly and Willie J Swanson

Proceedings of the National Academy of Sciences - PNAS, Vol.102(12), pp.4476-4481

03/22/2005

DOI: https://doi.org/10.1073/pnas.0406469102

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https://hdl.handle.net/2376/115804

PMCID: PMC555475

PMID: 15761060

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Abstract

Biological Sciences

positive selection

nonsynonymous

ligand binding

synonymous

maximum likelihood

We investigated the possibility of positive selection acting on members of the putative seven-pass chemoreceptor superfamily in Caenorhabditis elegans , which comprises ≈1,300 genes encoding seven-pass G protein-coupled receptors (GPCRs). Using a maximum-likelihood approach, we conducted statistical tests for evidence of codon sites where the ratio of nonsynonymous substitutions per nonsynonymous site to synonymous substitutions per synonymous site ( d N / d S ) was >1. Evidence for positive selection was found only for the srz family, about which virtually nothing specific is known. We extended the annotation of the srz gene family, establishing gene models for 60 srz genes in C. elegans and 28 srz genes in Caenorhabditis briggsae . d N / d S ratios varied dramatically in different regions of the SRZ proteins, peaking in predicted extracellular regions. These regions included 23 sites where evidence of positive selection was highly significant, corresponding remarkably well with regions implicated in ligand binding in other GPCR family members. We interpret these results as indicating that the srz family is under positive selection, probably driven by ligand binding.

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Title: Adaptive evolution in the SRZ chemoreceptor families of Caenorhabditis elegans and Caenorhabditis briggsae
Creators: James H Thomas - Department of Genome Sciences, University of Washington, Seattle, WA 91895; and
Joanna L Kelley - Department of Genome Sciences, University of Washington, Seattle, WA 91895; and
Hugh M Robertson - Department of Genome Sciences, University of Washington, Seattle, WA 91895; and
Kim Ly - Department of Genome Sciences, University of Washington, Seattle, WA 91895; and
Willie J Swanson - Department of Genome Sciences, University of Washington, Seattle, WA 91895; and
Publication Details: Proceedings of the National Academy of Sciences - PNAS, Vol.102(12), pp.4476-4481
Academic Unit: Biological Sciences, School of
Publisher: National Academy of Sciences
Identifiers: 99900547433101842
Language: English
Resource Type: Journal article