Extreme heterochiasmy and nascent sex chromosomes in European tree frogs.

Details

Ressource 1Download: BIB_66A5A996C066.P001.pdf (203.61 [Ko])
State: Public
Version: author
Serval ID
serval:BIB_66A5A996C066
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Extreme heterochiasmy and nascent sex chromosomes in European tree frogs.
Journal
Proceedings of the Royal Society of London B Biological Sciences
Author(s)
Berset-Brändli L., Jaquiéry J., Broquet T., Ulrich Y., Perrin N.
ISSN
0962-8452[print]
Publication state
Published
Issued date
2008
Peer-reviewed
Oui
Volume
275
Number
1642
Pages
1577-1585
Language
english
Notes
Publication types: Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
We investigated sex-specific recombination rates in Hyla arborea, a species with nascent sex chromosomes and male heterogamety. Twenty microsatellites were clustered into six linkage groups, all showing suppressed or very low recombination in males. Seven markers were sex linked, none of them showing any sign of recombination in males (r=0.00 versus 0.43 on average in females). This opposes classical models of sex chromosome evolution, which envision an initially small differential segment that progressively expands as structural changes accumulate on the Y chromosome. For autosomes, maps were more than 14 times longer in females than in males, which seems the highest ratio documented so far in vertebrates. These results support the pleiotropic model of Haldane and Huxley, according to which recombination is reduced in the heterogametic sex by general modifiers that affect recombination on the whole genome.
Keywords
Animals, Anura/genetics, Chromosome Mapping, DNA Primers/genetics, Female, Genetic Variation, Male, Microsatellite Repeats/genetics, Models, Genetic, Recombination, Genetic/genetics, Sex Chromosomes/genetics, Sex Factors, Switzerland
Pubmed
Web of science
Create date
26/03/2008 8:28
Last modification date
20/08/2019 14:22
Usage data