Sex-chromosome differentiation and 'sex races' in the common frog (Rana temporaria).

Details

Serval ID
serval:BIB_E0C4B51B25ED
Type
Article: article from journal or magazin.
Collection
Publications
Title
Sex-chromosome differentiation and 'sex races' in the common frog (Rana temporaria).
Journal
Proceedings. Biological Sciences / the Royal Society
Author(s)
Rodrigues N., Vuille Y., Loman J., Perrin N.
ISSN
1471-2954 (Electronic)
ISSN-L
0962-8452
Publication state
Published
Issued date
2015
Peer-reviewed
Oui
Volume
282
Number
1806
Pages
20142726
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
Sex-chromosome differentiation was recently shown to vary among common frog populations in Fennoscandia, suggesting a trend of increased differentiation with latitude. By rearing families from two contrasted populations (respectively, from northern and southern Sweden), we show this disparity to stem from differences in sex-determination mechanisms rather than in XY-recombination patterns. Offspring from the northern population display equal sex ratios at metamorphosis, with phenotypic sexes that correlate strongly with paternal LG2 haplotypes (the sex chromosome); accordingly, Y haplotypes are markedly differentiated, with male-specific alleles and depressed diversity testifying to their smaller effective population size. In the southern population, by contrast, a majority of juveniles present ovaries at metamorphosis; only later in development do sex ratios return to equilibrium. Even at these later stages, phenotypic sexes correlate only mildly with paternal LG2 haplotypes; accordingly, there are no recognizable Y haplotypes. These distinct patterns of gonadal development fit the concept of 'sex races' proposed in the 1930s, with our two populations assigned to the 'differentiated' and 'semi-differentiated' races, respectively. Our results support the suggestion that 'sex races' differ in the genetic versus epigenetic components of sex determination. Analysing populations from the 'undifferentiated race' with high-density genetic maps should help to further test this hypothesis.
Keywords
Animals, Biological Evolution, Female, Genetic Linkage, Genetic Markers, Haplotypes, Male, Rana temporaria/genetics, Recombination, Genetic, Sex Characteristics, Sex Chromosomes/genetics, Sex Ratio, Sweden
Pubmed
Web of science
Open Access
Yes
Create date
10/03/2015 9:03
Last modification date
20/08/2019 17:04
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