Sex-Chromosome Recombination in Common Frogs Brings Water to the Fountain-of-Youth.

Détails

ID Serval
serval:BIB_83588A8CBE65
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Sex-Chromosome Recombination in Common Frogs Brings Water to the Fountain-of-Youth.
Périodique
Molecular Biology and Evolution
Auteur(s)
Rodrigues N., Studer T., Dufresnes C., Perrin N.
ISSN
1537-1719 (Electronic)
ISSN-L
0737-4038
Statut éditorial
Publié
Date de publication
2018
Peer-reviewed
Oui
Volume
35
Numéro
4
Pages
942-948
Langue
anglais
Résumé
According to the canonical model of sex-chromosome evolution, the degeneration of Y or W chromosomes (as observed in mammals and birds, respectively) results from an arrest of recombination in the heterogametic sex, driven by the fixation of sexually antagonistic mutations. However, sex chromosomes have remained homomorphic in many lineages of fishes, amphibians, and nonavian reptiles. According to the "fountain-of-youth" model, this homomorphy results from occasional events of sex reversal. If recombination arrest in males is controlled by maleness per se (and not by genotype), then Y chromosomes are expected to recombine in XY females, preventing their long-term degeneration. Here, we provide field support for the fountain-of-youth, by showing that sex-chromosome recombination in Rana temporaria only depends on phenotypic sex: naturally occurring XX males show the same restriction of recombination as XY males (average map length ∼2 cM), while XY females recombine as much as XX females (average map length ∼150 cM). Our results challenge several common assumptions regarding the evolution of sex chromosomes, including the role of sexually antagonistic genes as drivers of recombination arrest, and that of chromosomal inversions as underlying mechanisms.
Mots-clé
Animals, Biological Evolution, Female, Genotype, Male, Phenotype, Rana temporaria/genetics, Recombination, Genetic, Sex Chromosomes
Pubmed
Web of science
Open Access
Oui
Création de la notice
19/01/2018 18:02
Dernière modification de la notice
20/08/2019 14:43
Données d'usage