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In patients heterozygous for abnormal hemoglobins there is usually less than 50% of the mutant hemoglobin present in peripheral blood. The synthetic rates of alpha-chain mutants compared to alpha(A) have not been reported to date. In this study the production of alpha(A)- and alpha(I)-chains has been measured in peripheral blood and bone marrow of two patients with approximately 30% hemoglobin I, an alpha-chain abnormality (alpha(16 lys --&gt; glu)). The results suggest that the decreased amount of alpha(I) compared to alpha(A) is due solely to diminished biosynthesis of the alpha(I)-chains. The relative rates of synthesis of alpha(I)- and alpha(A)-chains are similar in both nucleated red cells and reticulocytes indicating that no change occurs during erythroid cell maturation which preferentially affects either alpha(I) or alpha(A) production.

Diminished synthesis of an alpha chain mutant, hemoglobin I (α16 lys → glu)