Abstract
Both genome content and deployment contribute to phenotypic differences between species1,2,3,4,5. Sex is the most important difference between individuals in a species and has long been posited to be rapidly evolving. Indeed, in the Drosophila genus, traits such as sperm length, genitalia, and gonad size are the most obvious differences between species6. Comparative analysis of sex-biased expression should deepen our understanding of the relationship between genome content and deployment during evolution. Using existing7,8 and newly assembled genomes9, we designed species-specific microarrays to examine sex-biased expression of orthologues and species-restricted genes in D. melanogaster, D. simulans, D. yakuba, D. ananassae, D. pseudoobscura, D. virilis and D. mojavensis. We show that averaged sex-biased expression changes accumulate monotonically over time within the genus. However, different genes contribute to expression variance within species groups compared to between groups. We observed greater turnover of species-restricted genes with male-biased expression, indicating that gene formation and extinction may play a significant part in species differences. Genes with male-biased expression also show the greatest expression and DNA sequence divergence. This higher divergence and turnover of genes with male-biased expression may be due to high transcription rates in the male germline, greater functional pleiotropy of genes expressed in females, and/or sexual competition.
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Acknowledgements
We thank the Drosophila Comparative Genome Sequencing and Analysis Consortium for access to the assembly, alignment and annotation of the 12 sequenced Drosophila genomes, S. Davis for valuable technical advice, and K. P. White, C. Vinson, A. Clark, M. Lynch and members of the Oliver laboratory for helpful discussion and comments on the manuscript. We are supported by the Intramural Research Program of the NIH, NIDDK, except S.K. who is supported by the NIH Extramural Program.
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Supplementary Information
The file contains supplementary Figures S1-S5 with Legends and Supplementary Tables S1-S2. (PDF 1056 kb)
Supplementary Table
The file contains Supplementary Table S3-S16 for the list of genes with female-biased and male-biased expression in all seven species separately. (XLS 3513 kb)
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Zhang, Y., Sturgill, D., Parisi, M. et al. Constraint and turnover in sex-biased gene expression in the genus Drosophila. Nature 450, 233–237 (2007). https://doi.org/10.1038/nature06323
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DOI: https://doi.org/10.1038/nature06323
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