Limited heterogeneity of gamma globulin in hypogammaglobulinemia.

When serums of 11 patients with hypogammaglobulinemia were examined by acrylamide-gel electrophoresis, combined with diffusion analysis, for the gamma chain of immunoglobulin G, the electrophoretic distribution of immunoglobulin G differed from that of normal individuals. The differences consisted of limited heterogeneity and bimodal distributions of the proteins at times. Isolated immunoglobulin G from four of the patients showed similar phenomena. The findings indicate a deficient gene population in these patients.