SEVERE GLUCOSE-6-PHOSPHATE-DEHYDROGENASE (G6PD) DEFICIENCY ASSOCIATED WITH CHRONIC HEMOLYTIC-ANEMIA, GRANULOCYTE DYSFUNCTION, AND INCREASED SUSCEPTIBILITY TO INFECTIONS - DESCRIPTION OF A NEW MOLECULAR VARIANT (G6PD BARCELONA)

  • 1 January 1982
    • journal article
    • research article
    • Vol. 59  (2) , 428-434
Abstract
Molecular, kinetic and functional studies were carried out on erythrocytes and leukocytes in a Spanish male with G6PD [glucose-6-phosphate dehydrogenase] deficiency, congenital nonspherocytic hemolytic anemia (CNSHA), and increased susceptibility to infections. G6PD activity was absent in patient''s red cells and was about 2% of normal in leukocytes. Molecular studies using standard methods showed G6PD in the patient to have a slightly fast electrophoretic mobility at pH 8.0 with otherwise normal properties (heat stability at 46.degree. C, apparent affinity for substrates, optimum pH and utilization of substrate analogs). Other tests showed the patient''s granulocytes to engulf latex particles normally, but to have impaired reduction of nitroblue tetrazolium and ferricytochrome-c as well as reduced iodination. Chemotaxis and random migration of the patient''s granulocytes were normal as were myeloperoxidase, leukocyte alkaline phosphatase and ultrastructural features. The molecular characteristics of G6PD in the patient differed from those of all previously reported variants associated with CNSHA, so the present variant was provisionally called G6PD Barcelona to distinguish it from other G6PD variants previously described. Possible mechanisms for the severe deficiency of G6PD in erythrocytes and granulocytes were investigated by studies on the immunologic specific activity of the mutant enzyme.