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• W2030350996 endingPage "1585" @default.
• W2030350996 startingPage "1575" @default.
• W2030350996 abstract "Patterns of molecular evolution in birds have long been considered anomalous. Compared with other vertebrates, birds have reduced levels of genetic divergence between groups of similar taxonomic ranks for a variety of nuclear and mitochondrial markers. This observation led to the avian constraint hypothesis, which identifies increased functional constraint on avian proteins as the cause for the reduction in genetic divergence. Subsequent investigations provided additional support for the avian constraint hypothesis when rates of molecular evolution were found to be slower in birds than in mammals in a variety of independent calibrations. It is possible to test the avian constraint hypothesis as an explanation for this avian slowdown by comparing DNA sequence data from protein-coding regions in birds and homologous regions in mammals. The increased selective constraints should lead to a reduction in the proportion of amino acid replacement substitutions. To test for such a decrease, we calculated the numbers of amino acid replacement substitutions per replacement site (dN) and silent substitutions per silent site (dS) for the complete mitochondrial cytochrome b gene using 38 avian and 43 mammalian comparisons that were phylogenetically independent. We find that dN/dS is significantly smaller in birds than in mammals. This difference cannot be explained by differences in codon bias affecting dS values. We suggest that the avian slowdown can be explained, at least in part, by a decreased tolerance for amino acid substitutions in avian species relative to mammalian species." @default.
• W2030350996 created "2016-06-24" @default.
• W2030350996 creator A5021176243 @default.
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• W2030350996 date "1999-11-01" @default.
• W2030350996 modified "2023-09-25" @default.
• W2030350996 title "Cytochrome b evolution in birds and mammals: an evaluation of the avian constraint hypothesis" @default.
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• W2030350996 doi "https://doi.org/10.1093/oxfordjournals.molbev.a026070" @default.
• W2030350996 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10555289" @default.
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