Mol. Biol. Evol. 20(1):18-20. 2003
DOI:
© 2003 by the Society for Molecular Biology and Evolution. ISSN: 0737-4038
Pervasive Adaptive Evolution in Mammalian Fertilization Proteins



* Department of Genome Sciences, University of Washington
Departments of Biology and Genetics, University of California, Riverside
Department of Biological Statistics and Computational Biology, Cornell University
Mammalian fertilization exhibits species specificity, and the proteins mediating sperm-egg interactions evolve rapidly between species. In this study, we demonstrate that the evolution of seven genes involved in mammalian fertilization is promoted by positive Darwinian selection by using likelihood ratio tests (LRTs). Several of these proteins are sperm proteins that have been implicated in binding the mammalian egg coat zona pellucida glycoproteins, which were shown previously to be subjected to positive selection. Taken together, these represent the major candidates involved in mammalian fertilization, indicating positive selection is pervasive amongst mammalian reproductive proteins. A new LRT is implemented to determine if the dN/dS ratio is significantly greater than one. This is a more refined test of positive selection than the previous LRTs which only identified if there was a class of sites with a dN/dS ratio >1 but did not test if that ratio was significantly greater than one.
Key Words: positive Darwinian selection sexual conflict fertilization likelihood ratio test speciation
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