TY - JOUR
T1 - Regulation of fetal hemoglobin production
AU - Kazazian, H.
PY - 1974/12/1
Y1 - 1974/12/1
N2 - Recent data bearing on the regulation of γ chain synthesis in man indicate the following. Two or more γ chain loci are genetically linked to the δ and β chain loci. A qualitative switch in hemoglobin type occurs not once but twice prior to a conceptual age of 40 wk, and after 5 wk of fetal age, the production of both adult and fetal type chains takes place in a fraction of erythroid precursors throughout life. Genetic heterogeneity in the etiology of diseases of hemoglobin chain regulation, including the thalassemia syndromes and hereditary persistence of fetal hemoglobin (HPFH), is great; e.g., at least 7 different genes produce the HPFH state. On the other hand, present knowledge of the mechanisms by which γ chain synthesis is regulated, is weak, and even information on the normal process of γ chain assembly is lacking. At this time, there is no general theory which explains the normal hemoglobin changes in development, and the various Hb F levels and γ chain types in the HPFH, thalassemia, and abnormal hemoglobin states.
AB - Recent data bearing on the regulation of γ chain synthesis in man indicate the following. Two or more γ chain loci are genetically linked to the δ and β chain loci. A qualitative switch in hemoglobin type occurs not once but twice prior to a conceptual age of 40 wk, and after 5 wk of fetal age, the production of both adult and fetal type chains takes place in a fraction of erythroid precursors throughout life. Genetic heterogeneity in the etiology of diseases of hemoglobin chain regulation, including the thalassemia syndromes and hereditary persistence of fetal hemoglobin (HPFH), is great; e.g., at least 7 different genes produce the HPFH state. On the other hand, present knowledge of the mechanisms by which γ chain synthesis is regulated, is weak, and even information on the normal process of γ chain assembly is lacking. At this time, there is no general theory which explains the normal hemoglobin changes in development, and the various Hb F levels and γ chain types in the HPFH, thalassemia, and abnormal hemoglobin states.
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M3 - Review article
C2 - 4608465
AN - SCOPUS:0016355383
VL - 11
SP - 525
EP - 548
JO - Seminars in Hematology
JF - Seminars in Hematology
SN - 0037-1963
IS - 4
ER -