The Origin of Glucose-6-phosphate-dehydrogenase (G6PD) Polymorphisms in African-Americans

Overview

Journal Am J Hum Genet

Publisher Cell Press

Specialty Genetics

Date 1992 Feb 1

PMID 1734718

Citations 4

Authors

A C Kay

W KUHL

J Prchal

E Beutler

Affiliations

Soon will be listed here.

Abstract

DNA samples from 54 male Afro-Americans were examined for glucose-6-phosphate dehydrogenase (G6PD) genotypes G6PD A(+)376G, G6PD A(-)202A/376G, and G6PD B and for polymorphisms in intron 5 (PvuII), at nucleotide 1311, and at nucleotide 1116 (PstI). In the G6PD B subjects, the nucleotide 1311 mutation and the PstI site appeared to be in linkage equilibrium. No PvuII+ G6PD men were encountered. The G6PD A(+) mutation was in disequilibrium with respect to both the nucleotide 1311 mutation and the PstI site. The G6PD A- nucleotide 202 mutation was in disequilibrium with all three polymorphic sites. No conclusion could be drawn with respect to the PvuII site, except that it preceded the nucleotide 202 (A-) mutation. We conclude from these and our previous studies that G6PD B is the most ancient genotype. The nucleotide 1311 mutation, with its worldwide distribution, probably occurred next. The PstI mutation, limited to Africans, probably arose next and is more ancient than the A(+) mutation, which occurred in a gene without either the PstI or the 1311 mutation. G6PD A-202A/376G is the most recent of these mutations and is still in linkage disequilibrium with all of the sites. Presumably it occurred in an individual with both the A(+) and PvuII mutations.

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