Low rates of X-Y recombination, not turnovers, account for homomorphic sex chromosomes in several diploid species of Palearctic green toads (Bufo viridis subgroup).

Details

Serval ID
serval:BIB_4804FC88420F
Type
Article: article from journal or magazin.
Collection
Publications
Title
Low rates of X-Y recombination, not turnovers, account for homomorphic sex chromosomes in several diploid species of Palearctic green toads (Bufo viridis subgroup).
Journal
Journal of Evolutionary Biology
Author(s)
Stöck M., Savary R., Betto-Colliard C., Biollay S., Jourdan-Pineau H., Perrin N.
ISSN
1420-9101 (Electronic)
ISSN-L
1010-061X
Publication state
Published
Issued date
2013
Peer-reviewed
Oui
Volume
26
Number
3
Pages
674-682
Language
english
Abstract
Contrasting with birds and mammals, most ectothermic vertebrates present homomorphic sex chromosomes, which might be due either to a high turnover rate or to occasional X-Y recombination. We tested these two hypotheses in a group of Palearctic green toads that diverged some 3.3 million years ago. Using sibship analyses of sex-linked markers, we show that all four species investigated share the same pair of sex chromosomes and a pattern of male heterogamety with drastically reduced X-Y recombination in males. Phylogenetic analyses of sex-linked sequences show that X and Y alleles cluster by species, not by gametolog. We conclude that X-Y homomorphy and fine-scale sequence similarity in these species do not stem from recent sex-chromosome turnovers, but from occasional X-Y recombination.
Keywords
Phylogeny, recombination, sex-linked markers
Pubmed
Web of science
Open Access
Yes
Create date
26/11/2012 11:52
Last modification date
20/08/2019 14:54
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