MBE Advance Access published online on July 28, 2004
Molecular Biology and Evolution, doi:10.1093/molbev/msh223
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2004; all rights reserved
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1 Department of Biology II, Section of Evolutionary Biology University of Munich (LMU), Munich, Germany
* To whom correspondence should be addressed. E-mail: parsch{at}zi.biologie.uni-muenchen.de.
Studies of morphology, interspecific hybridization, protein/DNA sequences, and levels of gene expression have suggested that sex-related characters (particularly those involved in male reproduction) evolve rapidly relative to non-sex-related characters. Here we report a general comparison of evolutionary rates of sex-biased genes using data from cDNA microarray experiments and comparative genomic studies of Drosophila. Comparisons of nonsynonymous/synonymous substitution rates (dN/dS) between species of the D. melanogaster subgroup revealed that genes with male-biased expression had significantly faster rates of evolution than genes with female-biased or unbiased expression. The difference was due primarily to a higher dN in the male-biased genes. The same pattern was observed for comparisons among more distantly related species. In comparisons between D. melanogaster and D. pseudoobscura, genes with highly-biased male expression were significantly more divergent than genes with highly-biased female expression. In many cases, orthologs of D. melanogaster male-biased genes could not be identified in D. pseudoobscura through a BLAST search. In contrast to the male-biased genes, there was no clear evidence for accelerated rates of evolution in female-biased genes, and most comparisons indicated a reduced rate of evolution in female-biased genes relative to unbiased genes. Male-biased genes did not show an increased ratio of nonsynonymous/synonymous polymorphism within D. melanogaster, and comparisons of polymorphism/divergence ratios suggest that the rapid evolution of male-biased genes is due to positive selection.
Original Article
Molecular Evolution of Sex-Biased Genes in Drosophila
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