The genetic contribution to sex determination and number of sex chromosomes vary among populations of common frogs (Rana temporaria).

Details

Serval ID
serval:BIB_09D0A1BB127D
Type
Article: article from journal or magazin.
Collection
Publications
Title
The genetic contribution to sex determination and number of sex chromosomes vary among populations of common frogs (Rana temporaria).
Journal
Heredity
Author(s)
Rodrigues N., Vuille Y., Brelsford A., Merilä J., Perrin N.
ISSN
1365-2540 (Electronic)
ISSN-L
0018-067X
Publication state
Published
Issued date
2016
Peer-reviewed
Oui
Volume
117
Number
1
Pages
25-32
Language
english
Abstract
The patterns of sex determination and sex differentiation have been shown to differ among geographic populations of common frogs. Notably, the association between phenotypic sex and linkage group 2 (LG2) has been found to be perfect in a northern Swedish population, but weak and variable among families in a southern one. By analyzing these populations with markers from other linkage groups, we bring two new insights: (1) the variance in phenotypic sex not accounted for by LG2 in the southern population could not be assigned to genetic factors on other linkage groups, suggesting an epigenetic component to sex determination; (2) a second linkage group (LG7) was found to co-segregate with sex and LG2 in the northern population. Given the very short timeframe since post-glacial colonization (in the order of 1000 generations) and its seemingly localized distribution, this neo-sex chromosome system might be the youngest one described so far. It does not result from a fusion, but more likely from a reciprocal translocation between the original Y chromosome (LG2) and an autosome (LG7), causing their co-segregation during male meiosis. By generating a strict linkage between several important genes from the sex-determination cascade (Dmrt1, Amh and Amhr2), this neo-sex chromosome possibly contributes to the 'differentiated sex race' syndrome (strictly genetic sex determination and early gonadal development) that characterizes this northern population.
Keywords
Epigenetic sex determination, gonadal development, neo-sex chromosomes, Ranidae, sex differentiation, sex races.
Pubmed
Web of science
Open Access
Yes
Create date
26/02/2016 20:28
Last modification date
20/08/2019 13:31
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