Citations to this article

Molecular basis for nondeletion alpha-thalassemia in American blacks. Alpha 2(116GAG----UAG).
S A Liebhaber, … , F E Cash, M H Steinberg
S A Liebhaber, … , F E Cash, M H Steinberg
Published July 1, 1987
Citation Information: J Clin Invest. 1987;80(1):154-159. https://doi.org/10.1172/JCI113041.
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Research Article

Molecular basis for nondeletion alpha-thalassemia in American blacks. Alpha 2(116GAG----UAG).

Abstract

An American black woman was found to have the phenotype of moderately severe alpha-thalassemia normally associated with the loss of two to three alpha-globin genes despite an alpha-globin gene map that demonstrated the loss of only a single alpha-globin gene (-alpha/alpha alpha). Several individuals in her kindred with normal alpha-globin gene mapping studies (alpha alpha/alpha alpha) had mild alpha-thalassemia hematologic values consistent with the loss of one to two alpha-globin genes. These data suggested the presence of a nondeletion alpha-thalassemia defect in this family which segregates with the intact alpha alpha gene cluster. An abnormally migrating and highly unstable alpha-globin gene product was demonstrated by in vitro translation of the reticulocyte mRNA from the proposita and this mutant alpha-globin protein was mapped to the alpha 2-globin gene by hybrid-selected translation. The abnormal alpha 2-globin gene was cloned and sequenced. A single base mutation that results in a premature termination codon was identified at codon 116 (GAG----UAG). The defined alpha-globin genotype of the proposita (-alpha/alpha 116UAG alpha) and the positioning of this nonsense mutation at the alpha 2-globin gene locus are fully consistent with the observed alpha-thalassemia phenotype.

Authors

S A Liebhaber, M B Coleman, J G Adams 3rd, F E Cash, M H Steinberg

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