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Genetics, Vol 141, 237-244, Copyright © 1995
INVESTIGATIONS |
Evolutionary Relationships and Sequence Variation of {alpha}-Amylase Variants Encoded by Duplicated Genes in the Amy Locus of Drosophila melanogaster
N. Inomata, H. Shibata, E. Okuyama and T. Yamazaki
Laboratory of Population Genetics, Department of Biology, Faculty of Science, Kyushu University, Fukuoka 812, Japan
To infer the genealogical relationships of {alpha}-amylase electromorphs of Drosophila melanogaster, we determined the nucleotide sequences of a collection of electromorphs sampled throughout the world. On average there were 1.0 amino acid substitutions between identical electromorphs and 3.9 between different electromorphs, respectively. We found that the evolution of AMY(1) through AMY(6) electromorphs occurred by sequential accumulation of single amino acid substitutions each causing one charge difference. The nucleotide diversities at synonymous sites within Amy(1),Amy(2),Amy(3),Amy(4) and Amy(6) were 0.0321, 0.0000, 0.0355, 0.0059 and 0.0030, respectively. We also obtained evidence of genetic exchanges, such as intrachromosomal recombination, interchromosomal recombination or gene conversion, between the two duplicated Amy genes as well as among the alleles.
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