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Two new alpha-thalassemia point mutations that are undetectable by biochemical techniques
Philippe Joly1, Brigitté Pégourie, Stéphane Courby
1Unité de Pathologie Moléculaire, Fédération de Biochimie et de Biologie Spécialisée, Hôpital Edouard Herriot, Lyon, France.
Abstract:
We report two new point mutations causing alpha-thalassemia (alpha-thal) that could not be characterized by conventional biochemical studies. The first mutation is a single base substitution at codon 123 of the alpha1-globin gene [alpha123(H6)Ala-->Pro, GCC>CCC (alpha1)] and leads to the substitution of a proline residue in the H helix. The resulting unstable hemoglobin (Hb) variant has been named Hb Voreppe. The second is a frameshift of the alpha2 gene due to a deletion (-C), either of the third base of codon 112 or of the first base of codon 113, that causes a premature stop codon at position 132.
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