Maintenance of ancestral sex chromosomes in Palearctic tree frogs: direct evidence from Hyla orientalis.

Détails

ID Serval
serval:BIB_8FB488D40371
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Maintenance of ancestral sex chromosomes in Palearctic tree frogs: direct evidence from Hyla orientalis.
Périodique
Sexual Development
Auteur(s)
Stöck M., Savary R., Zaborowska A., Górecki G., Brelsford A., Rozenblut-Kościsty B., Ogielska M., Perrin N.
ISSN
1661-5433 (Electronic)
ISSN-L
1661-5425
Statut éditorial
Publié
Date de publication
2013
Peer-reviewed
Oui
Volume
7
Numéro
5
Pages
261-266
Langue
anglais
Résumé
Contrasting with the situation found in birds and mammals, sex chromosomes are generally homomorphic in poikilothermic vertebrates. This homomorphy was recently shown to result from occasional X-Y recombinations (not from turnovers) in several European species of tree frogs (Hyla arborea, H. intermedia and H. molleri). Because of recombination, however, alleles at sex-linked loci were rarely diagnostic at the population level; support for sex linkage had to rely on multilocus associations, combined with occasional sex differences in allelic frequencies. Here, we use direct evidence, obtained from anatomical and histological analyses of offspring with known pedigrees, to show that the Eastern tree frog (H. orientalis) shares the same pair of sex chromosomes, with identical patterns of male heterogamety and complete absence of X-Y recombination in males. Conservation of an ancestral pair of sex chromosomes, regularly rejuvenated via occasional X-Y recombination, seems thus a widespread pattern among Hyla species. Sibship analyses also identified discrepancies between genotypic and phenotypic sex among offspring, associated with abnormal gonadal development, suggesting a role for sexually antagonistic genes on the sex chromosomes.
Mots-clé
Homomorphic sex chromosomes, Anura, recombination, sex linkage, evolution, tree frogs.
Pubmed
Web of science
Création de la notice
25/02/2013 17:28
Dernière modification de la notice
03/03/2018 19:22
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