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A somatic mutation(s), acquired during the evolution of preleukemia in a 75-year-old Caucasian male of North European origin, resulted in a marked decrease in alpha-globin mRNA. The small amount of alpha-globin mRNA present in bone marrow cells was normally processed, had a normal (alpha 1/alpha 2)-globin mRNA ratio, and was translated normally. No detectable zeta-globin mRNA was found. The alpha- and zeta-globin genes were both hypomethylated and restriction endonuclease maps of the alpha- and zeta-globin genes were comparable in the patient's marrow and fibroblast DNA. The data are most consistent with the acquisition of a mutation(s) that resulted in decreased expression of all four alpha-globin genes.
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