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. 1979 Feb;76(2):852–856. doi: 10.1073/pnas.76.2.852

Genetic heterogeneity of "normal" human erythrocyte glucose-6-phosphate dehydrogenase: an isoelectrophoretic polymorphism.

G Modiano, G Battistuzzi, G J Esan, U Testa, L Luzzatto
PMCID: PMC383071  PMID: 284409

Abstract

Quantitative determination of glucose-6-phosphate dehydrogenase (G6PD; D-glucose-6-phosphate: NADP+ 1-oxidoreductase, EC 1.1.1.49) activity was carried out in 214 male Nigerian children of 84 mothers with known Gd genotype. The relative intrasibship difference in G6PD activity (normalized to the lowest value within the sibship) was below 0.18 in all cases but one when the children were known to have the same Gd+ allele (identical by descent); whereas it was higher than 0.18 in 18 out of 33 sibships in which children might have had either of the two maternal (electrophoretically identical) Gd+ alleles. G6PD from 10 (8 G6PD B and 2 G6PD A) children belonging to four of the sibships possessing high quantitative variation in G6PD activity was partially purified and extensively characterized. The 8 G6PD type B samples fell unambiguously into two classes on the basis of Km values for glucose 6-phosphate (determined at variuos pH values), and KCl gradient elution from DEAE-Sephadex columns. The two types of G6PD B were resolved from an artificial mixture on a DEAE-Sephacel column. The two G6PD type A samples were also different from each other by the same criteria. We conclude that "normal" G6PD is genetically heterogeneous and that the structural Gd alleles concerned are all polymorphic in the Nigerian population. In this instance, a human enzyme polymorphism, not associated with enzyme deficiency, is revealed by an approach other than electrophoresis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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