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. 2012 Feb 8;4(3):346–359. doi: 10.1093/gbe/evs012

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© The Author(s) 2012. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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FIG. 2.— — Evolutionary rates of reproductive and nonreproductive tissue-specific genes. Genes expressed specifically in male or female reproductive tissues are labeled as M-Rep and F-Rep, respectively. Genes with male- or female-biased expression that is not limited to reproductive tissues are labeled M-Other and F-Other, respectively. Genes with unbiased expression that is limited to a single somatic tissue are labeled U-TissueSpec. Panel (A) displays results for the melanogaster lineage. Panel (B) displays results for the obscura lineage. Genes with expression limited to male-reproductive tissues show significantly faster rates of evolution than all other groups (Mann–Whitney U test, P < 0.001 in all cases). Genes with expression limited to female-reproductive tissues show significantly faster rates of evolution than other female-biased genes for both lineages (P < 0.001). Furthermore, these genes show significantly faster rates of evolution than unbiased genes with tissue-specific expression for the melanogaster lineage (P = 0.009). For the obscura lineage, the same tendency can be observed but is not significant (P = 0.30).