Rate Variation of DNA Sequence Evolution in the Drosophila Lineages

Overview

Journal Genetics

Publisher Oxford University Press

Specialty Genetics

Date 1998 Jun 11

PMID 9611206

Citations 11

Authors

T S Takano

Affiliations

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Abstract

Rate constancy of DNA sequence evolution was examined for three species of Drosophila, using two samples: the published sequences of eight genes from regions of the normal recombination rates and new data of the four AS-C (ac, sc, l'sc and ase) and ci genes. The AS-C and ci genes were chosen because these genes are located in the regions of very reduced recombination in Drosophila melanogaster and their locations remain unchanged throughout the entire lineages involved, yielding less effect of ancestral polymorphism in the study of rate constancy. The synonymous substitution pattern of the three lineages was found to be erratic in both samples. The dispersion index for replacement substitution was relatively high for the per, G6pd and ac genes. A significant heterogeneity was found in the number of synonymous substitutions in the three lineages between the two samples of genes with different recombination rates. This is partly due to a lack of the lineage effect in the D. melanogaster and Drosophila simulans lineages in the AS-C and ci genes in contrast to Akashi's observation of genes in regions of normal recombination. The higher codon bias in Drosophila yakuba as compared with D. melanogaster and D. simulans was observed in the four AS-C genes, which suggests change(s) in action of natural selection involved in codon usage on these genes. Fluctuating selection intensity may also be responsible for the observed locus-lineage interaction effects in synonymous substitution.

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