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Polymorphism at a Sex-Linked Transcription Cofactor in European Tree Frogs ( Hyla arborea ): Sex-Antagonistic Selection or Neutral Processes?

Dufresnes, Christophe ; Luquet, Emilien ; Plenet, Sandrine ; Stöck, Matthias ; Perrin, Nicolas

In: Evolutionary Biology, 2011, vol. 38, no. 2, p. 208-213

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    Titre
    • Polymorphism at a Sex-Linked Transcription Cofactor in European Tree Frogs ( Hyla arborea ): Sex-Antagonistic Selection or Neutral Processes?
    Auteur
    • Dufresnes, Christophe. Department of Ecology and Evolution, University of Lausanne, 1015, Lausanne, Switzerland
    • Luquet, Emilien. CNRS UMR 5023, Ecologie des Hydrosystèmes Fluviaux, Université Claude Bernard Lyon1, 69622, Villeurbanne, France
    • Plenet, Sandrine. CNRS UMR 5023, Ecologie des Hydrosystèmes Fluviaux, Université Claude Bernard Lyon1, 69622, Villeurbanne, France
    • Stöck, Matthias. Department of Ecology and Evolution, University of Lausanne, 1015, Lausanne, Switzerland
    • Perrin, Nicolas. Department of Ecology and Evolution, University of Lausanne, 1015, Lausanne, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Evolutionary Biology, 2011, vol. 38, no. 2, p. 208-213. Springer US; http://www.springer-ny.com
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:312892
    Summary
    Nascent sex chromosomes offer a unique opportunity to investigate the evolutionary fate of genes recently trapped in non-recombining segments. A house-keeping 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