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TA Stoming, GS Stoming, KD Lanclos, YJ Fei, C Altay, F Kutlar and TH Huisman
Department of Cell and Molecular Biology, Medical College of Georgia,
Augusta 30912-2100.
The nondeletional types of hereditary persistence of fetal hemoglobin
(ndHPFH) concern the continued synthesis of hemoglobin (Hb) F with either G
gamma or A gamma chains in amounts varying from 5% to 30%. Several
mutations have been identified in either the A gamma or G gamma promoter
which are considered causative to the continued production of one of the
two gamma chains because the substitutions occur in sequence motifs
essential for the expression characteristics of the gamma-globin gene in
the 3' position. We report the discovery of a T----C mutation at position
-175 in the A gamma promoter which was associated with a greatly increased
level of Hb F (with mainly A gamma) and a decreased level of Hb A in the
one (Black) heterozygote who had a beta c gene in trans. The same mutation
has been observed in the G gamma promoter of a Black heterozygote who had
high levels of Hb F with G gamma chains only. A detailed comparison between
these two individuals indicated significant differences in the levels of Hb
F and Hb A which may result from an additional mutation at position -158 in
the G gamma promoter.
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