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- W1761346881 abstract "Abstract DNA sequences and chromosomal locations of four Drosophila pseudoobscura opsin genes were compared with those from Drosophila melanogaster, to determine factors that influence the evolution of multigene families. Although the opsin proteins perform the same primary functions, the comparisons reveal a wide range of evolutionary rates. Amino acid identities for the opsins range from 90% for Rh2 to more than 95% for Rh1 and Rh4. Variation in the rate of synonymous site substitution is especially striking: the major opsin, encoded by the Rh1 locus, differs at only 26.1% of synonymous sites between D. pseudoobscura and D. melanogaster, while the other opsin loci differ by as much as 39.2% at synonymous sites. Rh3 and Rh4 have similar levels of synonymous nucleotide substitution but significantly different amounts of amino acid replacement. This decoupling of nucleotide substitution and amino acid replacement suggests that different selective pressures are acting on these similar genes. There is significant heterogeneity in base composition and codon usage bias among the opsin genes in both species, but there are no consistent relationships between these factors and the rate of evolution of the opsins. In addition to exhibiting variation in evolutionary rates, the opsin loci in these species reveal rearrangements of chromosome elements." @default.
- W1761346881 created "2016-06-24" @default.
- W1761346881 creator A5019538549 @default.
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- W1761346881 date "1992-09-01" @default.
- W1761346881 modified "2023-09-23" @default.
- W1761346881 title "Variable rates of evolution among Drosophila opsin genes." @default.
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- W1761346881 doi "https://doi.org/10.1093/genetics/132.1.193" @default.
- W1761346881 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1205116" @default.
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