Artículos de revistas
Triploidy in a sexually dimorphic passerine provides new evidence for the effect of the W chromosome on secondary sexual traits in birds
Fecha
2017-11-01Registro en:
Journal Of Avian Biology. Hoboken: Wiley, v. 48, n. 11, p. 1475-1480, 2017.
0908-8857
10.1111/jav.01504
WOS:000416331100015
1926863917378909
3577149748456880
0000-0003-4600-0367
0000-0001-8735-6090
Autor
Universidade Estadual Paulista (Unesp)
Ohio State Univ
Universidade Federal de São Carlos (UFSCar)
Universidade de São Paulo (USP)
Institución
Resumen
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 SAo 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.