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Sardinian delta beta zero-thalassemia: a further example of a C to T substitution at position -196 of the A gamma globin gene promoter.

Abstract：

:Selective overexpression (50- to 100-fold) in adult erythroid cells of either G gamma or A gamma fetal globin gene is observed in hereditary conditions known as delta beta zero-thalassemia and hereditary persistence of fetal hemoglobin (HPFH). Recently, a C----T change at position -196 of an overexpressed A gamma globin gene from an Italian HPFH was hypothesized, on the basis of indirect evidence, to represent the cause of the functional defect. We now show that the same mutation is present in a different overexpressed A gamma-globin gene from a Sardinian patient with a different syndrome (delta beta zero-thalassemia). The Sardinian A gamma globin gene differs from both the HPFH and the normal A gamma globin gene at nucleotide 1,560 in the noncoding portion of the third exon, where an A is deleted. In addition, the mutant -196 A gamma-globin gene is linked to a normal beta globin gene in HPFH, and to a beta-thalassemic gene (beta 39CAG----TAG) in delta beta zero-thalassemia. These data strengthen the suggestion that -196 mutation is causally linked to the abnormal phenotype and raise the question of whether the same or multiple mutational events are responsible for the appearance of the -196 mutation in different syndromes.

journal_name

Blood

journal_title

Blood

authors

Ottolenghi S,Giglioni B,Pulazzini A,Comi P,Camaschella C,Serra A,Guerrasio A,Saglio G

subject

Has Abstract

pub_date

1987-04-01 00:00:00

pages

1058-61

issue

4

eissn

0006-4971

issn

1528-0020

journal_volume

69

pub_type

杂志文章

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