Adaptive protein evolution at the Adh locus in Drosophila

作者: John H. McDonald , Martin Kreitman

DOI: 10.1038/351652A0

关键词: Drosophila yakubaNearly neutral theory of molecular evolutionLocus (genetics)Molecular evolutionMcDonald–Kreitman testNeutral mutationEvolutionary biologyBiologyGeneticsDrosophila melanogasterFixation (population genetics)

摘要: Proteins often differ in amino-acid sequence across species. This difference has evolved by the accumulation of neutral mutations random drift, fixation adaptive selection, or a mixture two. Here we propose simple statistical test protein evolution hypothesis based on comparison number replacement substitutions to synonymous coding region locus. If observed are neutral, ratio fixed differences between species should be same as polymorphisms within DNA data Adh locus (encoding alcohol dehydrogenase, EC 1.1.1.1) three Drosophila melanogaster subgroup do not fit this expectation; instead, there more than expected. We suggest that these excess result from selectively advantageous mutations.

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