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Molecular Biology and Evolution, Vol 6, 384-397, Copyright © 1989 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Restriction-map variation associated with the G6PD polymorphism in natural populations of Drosophila melanogaster

WF Eanes, JW Ajioka, J Hey and C Wesley
Department of Ecology and Evolution, State University of New York, Stony Brook 11794.

Restriction-map variation was studied in 126 copies of the G6pd region in X chromosome lines of Drosophila melanogaster from North America, Europe, and Africa. Special attention was focused on the distribution of variation relative to the geographically variable polymorphism for two electrophoretic variants. Nucleotide heterozygosity as determined by eight six-cutter restriction enzymes for the 13-kb region is estimated, on the basis of the worldwide sample, to be 0.065%, which is the lowest value reported for any comparable region in the D. melanogaster genome. Significant linkage disequilibrium between electrophoretic alleles and restriction-site variation is observed for several sites. In contrast to published studies of other genetic regions, there are large insertions that reach significant frequencies and are found across considerable geographic distances. There is a clustering of this variation inside the first large intervening sequence of the G6PD gene.
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