Sex-Chromosome Homomorphy in Palearctic Tree Frogs Results from Both Turnovers and X-Y Recombination
Christophe Dufresnes, Amael Borzee, Agnes Horn, Matthias Stoeck, Massimo Ostini, Roberto Sermier, Jerome Wassef, Spartak N Litvinchuck, Tiffany A Kosch, Bruce Waldman, Yikweon Jang, Alan Brelsford, Nicolas Perrin
Molecular Biology and Evolution | OXFORD UNIV PRESS | Published : 2015
Contrasting with birds and mammals, poikilothermic vertebrates often have homomorphic sex chromosomes, possibly resulting from high rates of sex-chromosome turnovers and/or occasional X-Y recombination. Strong support for the latter mechanism was provided by four species of European tree frogs, which inherited from a common ancestor (∼ 5 Ma) the same pair of homomorphic sex chromosomes (linkage group 1, LG1), harboring the candidate sex-determining gene Dmrt1. Here, we test sex linkage of LG1 across six additional species of the Eurasian Hyla radiation with divergence times ranging from 6 to 40 Ma. LG1 turns out to be sex linked in six of nine resolved cases. Mapping the patterns of sex link..View full abstract
Awarded by Swiss National Science Foundation
The authors thank A. Olivier, M. Delaugerre and F. Baier for their contributions to the sampling, as well as Karim Ghali for help with raising frogs and Nicolas Salamin for assistance with phylogenetic analyses. Analyses of GBS data were performed at the Vital-IT (http://www.vital-it.ch) Center for high-performance computing of the SIB Swiss Institute of Bioinformatics. This work was supported by the Swiss National Science Foundation (grant 31003A_129894) to N.P. and the University of Lausanne (PhD fellowship from the Faculty of Biology and Medicine) to C.D.