'Gd(-) Hôtel Dieu': a new G-6PD variant with chronic hemolysis in a Negro patient from Senegal.

A G-6PD deficiency was detected in a Negro patient from Senegal suffering from congenital nonspherocytic hemolytic anemia. The main characteristics of this variant were: profound defect of G-6PD activity in the red cells, decreased immunologic specific activity, fast electrophoretic mobility, decreased Km-G-6P and normal Km-NADP+, normal inhibition by ATP and NADPH, slightly increased utilization of the substrate analogues, slightly biphasic pH curve, high heat lability, subnormal activation energy. The characteristics of this variant being unique, it was called 'G-6PD Hôtel Dieu.'