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Sex-Chromosome Homomorphy in Palearctic Tree Frogs Results from Both Turnovers and X-Y Recombination

Title
Sex-Chromosome Homomorphy in Palearctic Tree Frogs Results from Both Turnovers and X-Y Recombination
Authors
Dufresnes, ChristopheBorzee, AmaelHorn, AgnesStoeck, MatthiasOstini, MassimoSermier, RobertoWassef, JeromeLitvinchuck, Spartak N.Kosch, Tiffany A.Waldman, BruceJang, YikweonBrelsford, AlanPerrin, Nicolas
Ewha Authors
장이권
SCOPUS Author ID
장이권scopus
Issue Date
2015
Journal Title
MOLECULAR BIOLOGY AND EVOLUTION
ISSN
0737-4038JCR Link1537-1719JCR Link
Citation
vol. 32, no. 9, pp. 2328 - 2337
Keywords
HylarecombinationDMRT1sex-chromosome transitionsfountain of youth hypothesis
Publisher
OXFORD UNIV PRESS
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
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 (similar to 5Ma) 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 linkage to the Hyla phylogeny reveals several transitions in sex-determination systems within the last 10My, including one switch in heterogamety. Phylogenetic trees of DNA sequences along LG1 are consistent with occasional X-Y recombination in all species where LG1 is sex linked. These patterns argue against one of the main potential causes for turnovers, namely the accumulation of deleteriousmutations on nonrecombining chromosomes. Sibship analyses show that LG1 recombination is strongly reduced in males from most species investigated, including some in which it is autosomal. Intrinsically low male recombination might facilitate the evolution of male heterogamety, and the presence of important genes from the sex-determination cascade might predispose LG1 to become a sex chromosome.
DOI
10.1093/molbev/msv113
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자연과학대학 > 생명과학전공 > Journal papers
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