Extreme heterochiasmy and nascent sex chromosomes in European tree frogs.

Détails

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Etat: Serval
Version: de l'auteur
ID Serval
serval:BIB_66A5A996C066
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Extreme heterochiasmy and nascent sex chromosomes in European tree frogs.
Périodique
Proceedings of the Royal Society of London B Biological Sciences
Auteur(s)
Berset-Brändli L., Jaquiéry J., Broquet T., Ulrich Y., Perrin N.
ISSN
0962-8452[print]
Statut éditorial
Publié
Date de publication
2008
Peer-reviewed
Oui
Volume
275
Numéro
1642
Pages
1577-1585
Langue
anglais
Notes
Publication types: Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
We investigated sex-specific recombination rates in Hyla arborea, a species with nascent sex chromosomes and male heterogamety. Twenty microsatellites were clustered into six linkage groups, all showing suppressed or very low recombination in males. Seven markers were sex linked, none of them showing any sign of recombination in males (r=0.00 versus 0.43 on average in females). This opposes classical models of sex chromosome evolution, which envision an initially small differential segment that progressively expands as structural changes accumulate on the Y chromosome. For autosomes, maps were more than 14 times longer in females than in males, which seems the highest ratio documented so far in vertebrates. These results support the pleiotropic model of Haldane and Huxley, according to which recombination is reduced in the heterogametic sex by general modifiers that affect recombination on the whole genome.
Mots-clé
Animals, Anura/genetics, Chromosome Mapping, DNA Primers/genetics, Female, Genetic Variation, Male, Microsatellite Repeats/genetics, Models, Genetic, Recombination, Genetic/genetics, Sex Chromosomes/genetics, Sex Factors, Switzerland
Pubmed
Web of science
Création de la notice
26/03/2008 9:28
Dernière modification de la notice
03/03/2018 17:54
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