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

Détails

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Etat: Serval
Version: Final published version
ID Serval
serval:BIB_F2A86BE599BE
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Sex-specific allelic transmission bias suggests sexual conflict at MC1R.
Périodique
Molecular Ecology
Auteur(s)
Ducret V., Gaigher A., Simon C., Goudet J., Roulin A.
ISSN
1365-294X (Electronic)
ISSN-L
0962-1083
Statut éditorial
Publié
Date de publication
2016
Peer-reviewed
Oui
Volume
25
Numéro
18
Pages
4551-4563
Langue
anglais
Résumé
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.
Mots-clé
assortative pairing, colour polymorphism, heterozygote deficit, melanocortin-1 receptor, pheomelanin-based coloration, transmission ratio distortion
Pubmed
Web of science
Création de la notice
25/09/2016 17:56
Dernière modification de la notice
03/03/2018 22:40
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