Glucose-6-phosphate dehydrogenase Beaumont: a new variant with severe enzyme deficiency and chronic nonspherocytic hemolytic anemia.
Studies were carried out on erythrocytes and fibroblasts from a 3-year-old white male with severe glucose-6-phosphate dehydrogenase (G6PD) deficiency and chronic non-spherocytic hemolytic anemia. Red blood cell G6PD activity was less than 0.02% of normal values. Since the child's fibroblasts had 2-4% of normal enzymic activity, they were utilized as a source of enzyme for kinetic studies. The G6PD demonstrated marked heat lability, a normal Km value for glucose-6-phosphate (56 mumol/l), a nearly normal pH-activity curve, and increased utilization of 2-deoxyglucose-6-phosphate (76% of the rate with glucose-6-phosphate). These studies clearly indicate that this is a new molecular variant (G6PD Beaumont).
D000328:Adult; D000745:Anemia, Hemolytic, Congenital / Q000201:enzymology*; D000746:Anemia, Hemolytic, Congenital Nonspherocytic / Q000201:enzymology*; D002675:Child, Preschool; D004912:Erythrocytes / Q000201:enzymology; D005260:Female; D005347:Fibroblasts / Q000201:enzymology; D005954:Glucosephosphate Dehydrogenase / Q000097:blood* / Q000378:metabolism; D005955:Glucosephosphate Dehydrogenase Deficiency / Q000201:enzymology* / Q000235:genetics; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007527:Isoenzymes / Q000097:blood* / Q000378:metabolism; D007700:Kinetics; D008297:Male; D009504:Neutrophils / Q000201:enzymology; D013379:Substrate Specificity
D007527:Isoenzymes; D005954:Glucosephosphate Dehydrogenase