Evolution in the Fast Lane: Rapidly Evolving Sex-Related Genes in Drosophila
Evolution in the Fast Lane: Rapidly Evolving Sex-Related Genes in Drosophila
Abstract A large portion of the annotated genes in Drosophila melanogaster show sex-biased expression, indicating that sex and reproduction-related genes (SRR genes) represent an appreciable component of the genome. Previous studies, in which subsets of genes were compared among few Drosophila species, have found that SRR genes exhibit unusual evolutionary patterns. Here, we have used the newly released genome sequences from 12 Drosophila species, coupled to a larger set of SRR genes, to comprehensively test the generality of these patterns. Among 2505 SRR genes examined, including ESTs with biased expression in reproductive tissues and genes characterized as involved in gametogenesis, we find that a relatively high proportion of SRR genes have experienced accelerated divergence throughout the genus Drosophila. Several testis-specific genes, male seminal fluid proteins (SFPs), and spermatogenesis genes show lineage-specific bursts of accelerated evolution and positive selection. SFP genes also show evidence of lineage-specific gene loss and/or gain. These results bring us closer to understanding the details of the evolutionary dynamics of SRR genes with respect to species divergence.
- McMaster University Canada
- Harvard University United States
- University of Oxford United Kingdom
- Cornell University United States
- University of Winnipeg Canada
Male, Sex Characteristics, Models, Genetic, Reproduction, Ovary, Genes, Insect, Sex Determination Processes, Biological Evolution, Oogenesis, Testis, Animals, Drosophila Proteins, Drosophila, Female, Selection, Genetic, Spermatogenesis, Phylogeny
Male, Sex Characteristics, Models, Genetic, Reproduction, Ovary, Genes, Insect, Sex Determination Processes, Biological Evolution, Oogenesis, Testis, Animals, Drosophila Proteins, Drosophila, Female, Selection, Genetic, Spermatogenesis, Phylogeny
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