Geographic variation in sex-chromosome differentiation in the common frog (Rana temporaria).

Détails

ID Serval
serval:BIB_6BCC9EDEAD58
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Geographic variation in sex-chromosome differentiation in the common frog (Rana temporaria).
Périodique
Molecular Ecology
Auteur(s)
Rodrigues N., Merilä J., Patrelle C., Perrin N.
ISSN
1365-294X (Electronic)
ISSN-L
0962-1083
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
23
Numéro
14
Pages
3409-3418
Langue
anglais
Résumé
In sharp contrast with birds and mammals, sex-determination systems in ectothermic vertebrates are often highly dynamic and sometimes multifactorial. Both environmental and genetic effects have been documented in common frogs (Rana temporaria). One genetic linkage group, mapping to the largest pair of chromosomes and harbouring the candidate sex-determining gene Dmrt1, associates with sex in several populations throughout Europe, but association varies both within and among populations. Here, we show that sex association at this linkage group differs among populations along a 1500-km transect across Sweden. Genetic differentiation between sexes is strongest (FST  = 0.152) in a northern-boreal population, where male-specific alleles and heterozygote excesses (FIS  = -0.418 in males, +0.025 in females) testify to a male-heterogametic system and lack of X-Y recombination. In the southernmost population (nemoral climate), in contrast, sexes share the same alleles at the same frequencies (FST  = 0.007 between sexes), suggesting unrestricted recombination. Other populations show intermediate levels of sex differentiation, with males falling in two categories: some cluster with females, while others display male-specific Y haplotypes. This polymorphism may result from differences between populations in the patterns of X-Y recombination, co-option of an alternative sex-chromosome pair, or a mixed sex-determination system where maleness is controlled either by genes or by environment depending on populations or families. We propose approaches to test among these alternative models, to disentangle the effects of climate and phylogeography on the latitudinal trend, and to sort out how this polymorphism relates to the 'sexual races' described in common frogs in the 1930s.
Mots-clé
amphibian, ESD - GSD continuum, X-Y recombination, sex determination, sex reversal.
Pubmed
Web of science
Création de la notice
05/06/2014 10:26
Dernière modification de la notice
20/08/2019 14:25
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