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Opsin gene duplication and diversification in the guppy, a model for sexual selection


Hoffmann, M; Tripathi, N; Henz, S; Lindholm, A K; Weigel, D; Breden, F; Dreyer, C (2007). Opsin gene duplication and diversification in the guppy, a model for sexual selection. Proceedings of the Royal Society B: Biological Sciences, 274(4606):33-42.

Abstract

Identification of genes that control variation in adaptive characters is a prerequisite for understanding the
processes that drive sexual and natural selection.Male coloration and female colour perception play important
roles in mate choice in the guppy (Poecilia reticulata), a model organism for studies of natural and sexual
selection.We examined a potential source for the known variation in colour perception, by analysing genomic
and complementary DNA sequences of genes that code for visual pigment proteins. We find high sequence
variability, both within and between populations, and expanded copy number for long-wave sensitive (LWS)
opsin genes. Alleles with non-synonymous changes that suggest dissimilar spectral tuning properties occur in
the same population and even in the same individual, and the high frequency of non-synonymous substitutions
argues for diversifying selection acting on these proteins. Therefore, variability in tuning amino acids is
partitioned within individuals and populations of the guppy, in contrast to variability for LWS at higher
taxonomic levels in cichlids, a second model system for differentiation owing to sexual selection. Since opsin
variability parallels the extreme male colour polymorphism within guppy populations, we suggest that mate
choice has been a major factor driving the coevolution of opsins and male ornaments in this species.

Identification of genes that control variation in adaptive characters is a prerequisite for understanding the
processes that drive sexual and natural selection.Male coloration and female colour perception play important
roles in mate choice in the guppy (Poecilia reticulata), a model organism for studies of natural and sexual
selection.We examined a potential source for the known variation in colour perception, by analysing genomic
and complementary DNA sequences of genes that code for visual pigment proteins. We find high sequence
variability, both within and between populations, and expanded copy number for long-wave sensitive (LWS)
opsin genes. Alleles with non-synonymous changes that suggest dissimilar spectral tuning properties occur in
the same population and even in the same individual, and the high frequency of non-synonymous substitutions
argues for diversifying selection acting on these proteins. Therefore, variability in tuning amino acids is
partitioned within individuals and populations of the guppy, in contrast to variability for LWS at higher
taxonomic levels in cichlids, a second model system for differentiation owing to sexual selection. Since opsin
variability parallels the extreme male colour polymorphism within guppy populations, we suggest that mate
choice has been a major factor driving the coevolution of opsins and male ornaments in this species.

Citations

48 citations in Web of Science®
22 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Uncontrolled Keywords:guppy, LWS opsin, gene duplication, gene diversification, visual pigment, sexual selection
Language:English
Date:2007
Deposited On:11 Feb 2008 12:14
Last Modified:05 Apr 2016 12:14
Publisher:Royal Society of London
ISSN:0962-8452
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:10.1098/rspb.2006.3707
PubMed ID:17015333

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