G6PD Kanazawa: A New Variant of Glucose-6-Phosphate Dehydrogenase Associated with Congenital Nonspherocytic Hemolytic Anemia

A new variant of G6PD associated with chronic nonspherocytic hemolytic anemia (CNSHA) in a Japanese male is described. This variant is unique in that it has a normal electrophoretic mobility, normal Km for glucose-6-phosphate and NADP, and a normal utilization of the substrate 2-deoxyglucose-6-phosphate and deamino-NADP. It also shows a decreased thermal stability and a biphasic pH curve. These characteristics distinguish this variant from previously reported variants associated with CNSHA and we have called it G6PD Kanazawa.