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Originally published as Genetics Published Articles Ahead of Print on July 2, 2006.
Genetics, Vol. 174, 411-420, September 2006, Copyright © 2006
doi:10.1534/genetics.106.057414
No Accelerated Rate of Protein Evolution in Male-Biased Drosophila pseudoobscura Genes
Muralidhar Metta, Rambabu Gudavalli, Jean-Michel Gibert and Christian Schlötterer1
Institut für Tierzucht und Genetik, Veterinärmedizinische Universität Wien, 1210 Wien, Austria
1 Corresponding author: Institut für Tierzucht und Genetik, Veterinärmedizinische Universität Wien, Veterinärplatz 1, 1210 Wien, Austria.
E-mail: christian.schloetterer{at}vu-wien.ac.at
Sexually dimorphic traits are often subject to diversifying selection. Genes with a male-biased gene expression also are probably affected by sexual selection and have a high rate of protein evolution. We used SAGE to measure sex-biased gene expression in Drosophila pseudoobscura. Consistent with previous results from D. melanogaster, a larger number of genes were male biased (402 genes) than female biased (138 genes). About 34% of the genes changed the sex-related expression pattern between D. melanogaster and D. pseudoobscura. Combining gene expression with protein divergence between both species, we observed a striking difference in the rate of evolution for genes with a male-biased gene expression in one species only. Contrary to expectations, D. pseudoobscura genes in this category showed no accelerated rate of protein evolution, while D. melanogaster genes did. If sexual selection is driving molecular evolution of male-biased genes, our data imply a radically different selection regime in D. pseudoobscura.
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