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1 June 2009 Sex-Linkage of Sexually Antagonistic Genes is Predicted by Female, but Not Male, Effects in Birds
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Abstract

Evolutionary theory predicts that sexually antagonistic loci will be preferentially sex-linked, and this association can be empirically testes with data on sex-blased gene expression with the assumption that sex-blased gene expression represents the resolution of past sexual antagonism. However, incomplete dosage compensating mechanisms and meiotic sex chromosome inactivation have hampered efforts to connect expression data to theoretical predictions regarding the genomic distribution of sexually antagonistic loci in a variety of animals. Here we use data on the underlying regulatory mechanism that produce expression sex-blas to test the genomic distribution of sexually antagonistic genes in chicken. Using this approach, which is free from problems associated with the lack of dosage compensation in birds, we show that female-detriment genes are significantly overrepresented on the Z chromosome, and female-benefit genes underrepresented. By contrast, male-effect genes show no over- or underrepresentation on the Z chromosome. These data are consistent with a dominant mode of inheritance for sexually antagonistic genes, in which male-benefit coding mutations are more likely to be fixed on the Z due to stronger male-specific selective pressures. After fixation of male-benefit alleles, regulatory changes in females evolve to minimize antagonism by reducing female expression.

©2009 The Society for the Study of Evolution.
Judith E. Mank and Hans Ellegren "Sex-Linkage of Sexually Antagonistic Genes is Predicted by Female, but Not Male, Effects in Birds," Evolution 63(6), 1464-1472, (1 June 2009). https://doi.org/10.1111/j.1558-5646.2009.00618.x
Received: 10 July 2008; Accepted: 1 November 2008; Published: 1 June 2009
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