Sex-specific allelic transmission bias suggests sexual conflict at MC1R.

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State: Public
Version: Final published version
Serval ID
serval:BIB_F2A86BE599BE
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Sex-specific allelic transmission bias suggests sexual conflict at MC1R.
Journal
Molecular Ecology
Author(s)
Ducret V., Gaigher A., Simon C., Goudet J., Roulin A.
ISSN
1365-294X (Electronic)
ISSN-L
0962-1083
Publication state
Published
Issued date
2016
Peer-reviewed
Oui
Volume
25
Number
18
Pages
4551-4563
Language
english
Abstract
Sexual conflict arises when selection in one sex causes the displacement of the other sex from its phenotypic optimum, leading to an inevitable tension within the genome - called intralocus sexual conflict. Although the autosomal melanocortin-1-receptor gene (MC1R) can generate colour variation in sexually dichromatic species, most previous studies have not considered the possibility that MC1R may be subject to sexual conflict. In the barn owl (Tyto alba), the allele MC1RWHITE is associated with whitish plumage coloration, typical of males, and the allele MC1RRUFOUS is associated with dark rufous coloration, typical of females, although each sex can express any phenotype. Because each colour variant is adapted to specific environmental conditions, the allele MC1RWHITE may be more strongly selected in males and the allele MC1RRUFOUS in females. We therefore investigated whether MC1R genotypes are in excess or deficit in male and female fledglings compared with the expected Hardy-Weinberg proportions. Our results show an overall deficit of 7.5% in the proportion of heterozygotes in males and of 12.9% in females. In males, interannual variation in assortative pairing with respect to MC1R explained the year-specific deviations from Hardy-Weinberg proportions, whereas in females, the deficit was better explained by the interannual variation in the probability of inheriting the MC1RWHITE or MC1RRUFOUS allele. Additionally, we observed that sons inherit the MC1RRUFOUS allele from their fathers on average slightly less often than expected under the first Mendelian law. Transmission ratio distortion may be adaptive in this sexually dichromatic species if males and females are, respectively, selected to display white and rufous plumages.
Keywords
assortative pairing, colour polymorphism, heterozygote deficit, melanocortin-1 receptor, pheomelanin-based coloration, transmission ratio distortion
Pubmed
Web of science
Create date
25/09/2016 16:56
Last modification date
20/08/2019 16:19
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