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Hemoglobin
international journal for hemoglobin research
Volume 32, 2008 - Issue 4
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Review Article

Unstable and Thalassemic α Chain Hemoglobin Variants: A Cause of Hb H Disease and Thalassemia Intermedia

Henri Wajcman INSERM U841, 94010, Créteil, FranceCorrespondence[email protected]
,
Jan Traeger-Synodinos Laboratory of Medical Genetics, University of Athens, “Aghia Sophia” Children's Hospital, Athens, Greece
,
Ioannis Papassotiriou Department of Clinical Biochemistry, “Aghia Sophia” Children's Hospital, Athens, Greece
,
Piero C. Giordano Departments of Human and Clinical Genetics and The Hemoglobinopathies Laboratory, Leiden University Medical Center, Leiden, The Netherlands
,
Cornelis L. Harteveld Departments of Human and Clinical Genetics and The Hemoglobinopathies Laboratory, Leiden University Medical Center, Leiden, The Netherlands
,
Véronique Baudin-Creuza INSERM U779, 94275 Le Kremlin-Bicêtre Cedex, France
&
John Old National Haemoglobinopathy Reference Laboratory, Oxford Haemophilia Centre, Churchill Hospital, Oxford, United Kingdom
 show all
Pages 327-349 | Received 08 Jan 2008, Accepted 03 Feb 2008, Published online: 07 Jul 2009
 
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Abstract

We report an update of the α-globin gene point mutations resulting in structural modification associated with an α-thalassemia (α-thal) phenotype. These variants, barely symptomatic in the heterozygous state, are either unstable due to folding defects and/or defects in binding to α-hemoglobin stabilizing protein (AHSP). This is predicted to result in precipitation of the unstable α chains or Hb variant, a concomitant decrease in the overall quantity of normal α-globin in the red cells and a potential degree of anemia and possibly, hemolysis. Genotype/phenotype correlation and potential genetic risk in combination with common or less common α-thal defects are discussed.

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