Polymorphism at a sex-linked transcription cofactor in European tree frogs (Hyla arborea): Sex-antagonistic selection or neutral processes?

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Serval ID
serval:BIB_47375818FE78
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Polymorphism at a sex-linked transcription cofactor in European tree frogs (Hyla arborea): Sex-antagonistic selection or neutral processes?
Journal
Evolutionary Biology
Author(s)
Dufresnes C., Luquet E., Plenet S., Stöck M., Perrin N.
ISSN
0071-3260
Publication state
Published
Issued date
2011
Peer-reviewed
Oui
Volume
38
Number
2
Pages
208-213
Language
english
Abstract
Nascent sex chromosomes offer a unique opportunity to investigate the evolutionary fate of genesrecently trapped in non-recombining segments. A housekeeping gene (MED15) was recently shown to lie on the nascent sex-chromosomes of the European tree frog (Hyla arborea), with different alleles fixed on the X and the Y chromosomes. Here we document a polymorphism (glutamine deletion) in the X copy of the gene, and use population surveys and experimental crosses to test whether this polymorphism is neutral or maintained by sex-antagonistic selection. Tadpoles from parents of known genotypes revealed significant discrepancies from Mendelian inheritance, suggesting possible sex-antagonistic effects under laboratory conditions. Quantitatively, however, these effects did not meet the conditions for polymorphism maintenance. Furthermore, field estimates of female genotypic frequencies did not differ from Hardy-Weinberg equilibrium and allelic frequencies on the X chromosome did not differ between sexes. In conclusion, although sex antagonistic effects cannot be excluded given the laboratory conditions, the X-linked polymorphism under study appears neutral in the wild. Alternatively, sex-antagonistic selection might still account for the fixation of a male specific allele on the Y chromosome.
Keywords
Amphibians, Hyla arborea, Glutamine repeats, Population genetics, Sex chromosomes, Transcription cofactor MED15
Web of science
Open Access
Yes
Create date
27/02/2011 11:51
Last modification date
01/10/2019 7:17
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