Ever-young sex chromosomes in European tree frogs.

Détails

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Etat: Serval
Version: de l'auteur
ID Serval
serval:BIB_4D3826357499
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Ever-young sex chromosomes in European tree frogs.
Périodique
PLoS Biology
Auteur(s)
Stöck M., Horn A., Grossen C., Lindtke D., Sermier R., Betto-Colliard C., Dufresnes C., Bonjour E., Dumas Z., Luquet E., Maddalena T., Sousa H.C., Martinez-Solano I., Perrin N.
ISSN
1545-7885 (Electronic)
ISSN-L
1544-9173
Statut éditorial
Publié
Date de publication
2011
Peer-reviewed
Oui
Volume
9
Numéro
5
Pages
e1001062
Langue
anglais
Notes
rated 8 ("must read") by Faculty of 1000. Sun S, Heitman J: 2011. F1000.com/13293960
Résumé
Non-recombining sex chromosomes are expected to undergo evolutionary decay, ending up genetically degenerated, as has happened in birds and mammals. Why are then sex chromosomes so often homomorphic in cold-blooded vertebrates? One possible explanation is a high rate of turnover events, replacing master sex-determining genes by new ones on other chromosomes. An alternative is that X-Y similarity is maintained by occasional recombination events, occurring in sex-reversed XY females. Based on mitochondrial and nuclear gene sequences, we estimated the divergence times between European tree frogs (Hyla arborea, H. intermedia, and H. molleri) to the upper Miocene, about 5.4-7.1 million years ago. Sibship analyses of microsatellite polymorphisms revealed that all three species have the same pair of sex chromosomes, with complete absence of X-Y recombination in males. Despite this, sequences of sex-linked loci show no divergence between the X and Y chromosomes. In the phylogeny, the X and Y alleles cluster according to species, not in groups of gametologs. We conclude that sex-chromosome homomorphy in these tree frogs does not result from a recent turnover but is maintained over evolutionary timescales by occasional X-Y recombination. Seemingly young sex chromosomes may thus carry old-established sex-determining genes, a result at odds with the view that sex chromosomes necessarily decay until they are replaced. This raises intriguing perspectives regarding the evolutionary dynamics of sexually antagonistic genes and the mechanisms that control X-Y recombination.
Mots-clé
Animals, Anura/genetics, Female, Gene Frequency, Genes, X-Linked, Genes, Y-Linked, Genetic Linkage, Genetic Markers, Genetic Speciation, Likelihood Functions, Male, Models, Genetic, Phylogeny, Recombination, Genetic, Sex Determination Processes, X Chromosome/genetics, Y Chromosome/genetics
Pubmed
Web of science
Open Access
Oui
Création de la notice
07/04/2011 20:22
Dernière modification de la notice
08/05/2019 18:19
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