Balanced globin chain synthesis in hereditary persistence of fetal hemoglobin

Abstract

In 2 black families with the hereditary persistence of fetal hemoglobin (HPFH) gene there are 8 A F heterozygotes and 2 double heterozygotes for sickle cell trait and HPFH. These patients are clinically asymptomatic and have homogeneous acid elution smears. Measurement of globin chain synthesis in peripheral blood demonstrates balanced production of a α and non α (β plus γ) chains. In these patients, the balance is achieved by increased γ globin production and increased activity of the remaining β globin allele. In 2 patients, one A F and the other S F there is also balanced globin synthesis in the bone marrow. In a double heterozygote for HPFH and β thalassemia, anemia (Hb: 11.5 g/100 ml) is associated with a moderate degree of globin chain imbalance. There is a correlation between balanced globin chain synthesis and the absence of anemia in patients with HPFH.