Effect of the MC1R gene on sexual dimorphism in melanin-based colorations.

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Version: Final published version
Serval ID
serval:BIB_D492AB497E8D
Type
Article: article from journal or magazin.
Collection
Publications
Title
Effect of the MC1R gene on sexual dimorphism in melanin-based colorations.
Journal
Molecular Ecology
Author(s)
San-Jose L.M., Ducrest A.L., Ducret V., Béziers P., Simon C., Wakamatsu K., Roulin A.
ISSN
1365-294X (Electronic)
ISSN-L
0962-1083
Publication state
Published
Issued date
2015
Peer-reviewed
Oui
Volume
24
Number
11
Pages
2794-2808
Language
english
Abstract
Variants of the melanocortin-1 receptor (MC1R) gene result in abrupt, naturally selected colour morphs. These genetic variants may differentially affect sexual dimorphism if one morph is naturally selected in the two sexes but another morph is naturally or sexually selected only in one of the two sexes (e.g. to confer camouflage in reproductive females or confer mating advantage in males). Therefore, the balance between natural and sexual selections can differ between MC1R variants, as suggest studies showing interspecific correlations between sexual dimorphism and the rate of nonsynonymous vs. synonymous amino acid substitutions at the MC1R. Surprisingly, how MC1R is related to within-species sexual dimorphism, and thereby to sex-specific selection, has not yet been investigated. We tackled this issue in the barn owl (Tyto alba), a species showing pronounced variation in the degree of reddish pheomelanin-based coloration and in the number and size of black feather spots. We found that a valine (V)-to-isoleucine (I) substitution at position 126 explains up to 30% of the variation in the three melanin-based colour traits and in feather melanin content. Interestingly, MC1R genotypes also differed in the degree of sexual colour dimorphism, with individuals homozygous for the II MC1R variant being 2 times redder and 2.5 times less sexually dimorphic than homozygous individuals for the VV MC1R variant. These findings support that MC1R interacts with the expression of sexual dimorphism and suggest that a gene with major phenotypic effects and weakly influenced by variation in body condition can participate in sex-specific selection processes.
Keywords
adaptive coloration, barn owl, genetic basis of coloration, natural selection, pigmentation, sexual selection
Pubmed
Web of science
Create date
02/05/2015 17:41
Last modification date
20/08/2019 16:54
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