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

Stöck Matthias, Savary Romain, Betto-Colliard Caroline, Biollay S., Jourdan Hélène, Perrin Nicolas. 2013. 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 of Evolutionary Biology, 26 (3) : 674-682.

Quartile : Q1, Sujet : ECOLOGY / Quartile : Q2, Sujet : GENETICS & HEREDITY / Quartile : Q2, Sujet : EVOLUTIONARY BIOLOGY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : 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.

Classification Agris : L20 - Écologie animale

Champ stratégique Cirad : Hors axes (2005-2013)

Auteurs et affiliations

• Stöck Matthias, Institute of Freshwater Ecology and Inland Fisheries (DEU)
• Savary Romain, UNIL (CHE)
• Betto-Colliard Caroline, UNIL (CHE)
• Biollay S., UNIL (CHE)
• Jourdan Hélène, CIRAD-BIOS-UMR CBGP (FRA) ORCID: 0000-0002-5118-9873
• Perrin Nicolas, UNIL (CHE)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/571020/)

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