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Low rates of X-Y recombination, not turnovers, account for homomorphic sex chromosomes in several diploid species of alearctic green toads (Bufo viridis subgroup).
MedLine Citation:
PMID:  23316809     Owner:  NLM     Status:  Publisher    
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.
M Stöck; R Savary; C Betto-Colliard; S Biollay; H Jourdan-Pineau; N Perrin
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-14
Journal Detail:
Title:  Journal of evolutionary biology     Volume:  -     ISSN:  1420-9101     ISO Abbreviation:  J. Evol. Biol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8809954     Medline TA:  J Evol Biol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 The Authors. Journal of Evolutionary Biology © 2013 European Society For Evolutionary Biology.
Department of Ecology and Evolution (DEE), University of Lausanne, Lausanne, Switzerland; Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Müggelseedamm 310, Berlin, Germany.
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