PMID: 7543730Aug 1, 1995Paper

Fetal hemoglobin expression in compound heterozygotes for -117 (G-->A)A gamma HPFH and beta zero 39 nonsense thalassemia

American Journal of Hematology
P PistiddaM Longinotti

Abstract

The -117(G-->A)A gamma hereditary persistence of fetal hemoglobin (Greek HPFH) and beta zero 39-thal mutations are rather frequent in Sardinia so that their interaction is to be expected. Characterization of eight compound heterozygotes for these defects indicated that HPFH was linked to haplotype VII and beta zero 39-thal to haplotype II. Haplotype II beta zero 39-thal chromosome carries the A gamma T gene which is a useful marker of gamma-gene expression. Since the Hb F level in these compound heterozygotes was significantly higher than in 46 -117 HPFH carriers, the A gamma I, A gamma T, and G gamma globin level was determined. A gamma T was underexpressed while G gamma was significantly increased, which suggest that in -117 A gamma HPFH/beta zero 39-thal healthy subjects the increase in Hb F production is determined only by the -117 mutated A gamma gene and the adjacent G gamma gene.

References

Jan 1, 1975·British Journal of Haematology·K SofroniadouG Stamatoyannopoulos
Nov 18, 1988·Science·T PapayannopoulouG Stamatoyannopoulos
May 1, 1987·Proceedings of the National Academy of Sciences of the United States of America·M PirastuY W Kan
Mar 18, 1982·Nature·S H Orkin

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