Dmrt1 polymorphism covaries with sex-determination patterns in Rana temporaria.

Détails

Ressource 1Télécharger: Ma_et_al-2016-Ecology_and_Evolution.pdf (667.38 [Ko])
Etat: Serval
Version: de l'auteur
ID Serval
serval:BIB_20A93540E9BA
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Dmrt1 polymorphism covaries with sex-determination patterns in Rana temporaria.
Périodique
Ecology and Evolution
Auteur(s)
Ma W.J., Rodrigues N., Sermier R., Brelsford A., Perrin N.
ISSN
2045-7758 (Electronic)
ISSN-L
2045-7758
Statut éditorial
Publié
Date de publication
2016
Peer-reviewed
Oui
Volume
6
Numéro
15
Pages
5107-5117
Langue
anglais
Résumé
Patterns of sex-chromosome differentiation and gonadal development have been shown to vary among populations of Rana temporaria along a latitudinal transect in Sweden. Frogs from the northern-boreal population of Ammarnäs displayed well-differentiated X and Y haplotypes, early gonadal differentiation, and a perfect match between phenotypic and genotypic sex. In contrast, no differentiated Y haplotypes could be detected in the southern population of Tvedöra, where juveniles furthermore showed delayed gonadal differentiation. Here, we show that Dmrt1, a gene that plays a key role in sex determination and sexual development across all metazoans, displays significant sex differentiation in Tvedöra, with a Y-specific haplotype distinct from Ammarnäs. The differential segment is not only much shorter in Tvedöra than in Ammarnäs, it is also less differentiated and associates with both delayed gonadal differentiation and imperfect match between phenotypic and genotypic sex. Whereas Tvedöra juveniles with a local Y haplotype tend to ultimately develop as males, those without it may nevertheless become functional XX males, but with strongly female-biased progeny. Our findings suggest that the variance in patterns of sex determination documented in common frogs might result from a genetic polymorphism within a small genomic region that contains Dmrt1. They also substantiate the view that recurrent convergences of sex determination toward a limited set of chromosome pairs may result from the co-option of small genomic regions that harbor key genes from the sex-determination pathway.
Mots-clé
Gonadal development, homomorphic sex chromosomes, non-recombining segment, sex determination, sex races, sex reversal.
Pubmed
Web of science
Open Access
Oui
Création de la notice
02/05/2016 21:30
Dernière modification de la notice
08/05/2019 15:36
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