| Titre : | Triploidy in a sexually dimorphic passerine provides new evidence for the effect of the W chromosome on secondary sexual traits in birds (2017) |
| Auteurs : | Crisley de Camargo, Auteur ; H. Lisle Gibbs, Auteur ; Mariellen C. Costa, Auteur ; Luís F. Silveira, Auteur ; Cláudia A. Rainho, Auteur ; Paulo E. M. Ribolla, Auteur ; Adriane P. Wasko, Auteur ; Mercival R. Francisco, Auteur |
| Type de document : | Article |
| Dans : | Journal of Avian Biology (48(11) November 1, 2017) |
| Article en page(s) : | 1475-1480 |
| Langues: | Anglais |
| Résumé : | In birds, there are two main models for the determination of sex: the ‘Z Dosage’ model in which the number, or dose, of Z chromosomes determines sex, and the ‘Dominant W’ model which argues that a specific gene in the W chromosome may influence Z gene expression and determine sex. The best evidence for W determination of sex comes from birds with 2 copies of the Z chromosome paired with a single W (e.g. ZZW) which are nonetheless females. Here, we expand the species where such a mechanism may operate by reporting a case of a triploid Neotropical passerine bird with sexually dimorphic plumage, the São Paulo marsh antwren Formicivora paludicola. Evidence from 17 autosomal unlinked microsatellite loci, and CHD1 sex-linked locus, indicate that this individual is a 3n ZZW triploid with intermediate plumage pattern. This example expands our knowledge of sex determination mechanisms in birds by demonstrating that both the W and the two Z chromosomes affect the expression of morphological secondary sexual traits in a non-galliform bird. |
| En ligne : | http://onlinelibrary.wiley.com/doi/10.1111/jav.01504/abstract |



