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23.03.2017 | Original Article

A molecular study on the role of alpha-hemoglobin-stabilizing protein in hemoglobin H disease

verfasst von: Pacharapan Surapolchai, Ampaiwan Chuansumrit, Nongnuch Sirachainan, Praguywan Kadegasem, Ka-Chun Leung, Chi-Chiu So

Erschienen in: Annals of Hematology | Ausgabe 6/2017

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Abstract

The clinical course of hemoglobin H (HbH) disease is remarkably variable. It is not completely clear how genetic and environmental factors interplay to modify clinical severity in affected individuals. Previous studies suggested that altered structure or function of alpha-hemoglobin-stabilizing protein (AHSP) could modify the clinical phenotypes of thalassemias. The present study attempted to explore the potential role of AHSP in the pathophysiology of HbH disease in 95 Chinese and Thai/Sino-Thai patients with deletional and non-deletional form of this disease. We identified six polymorphic sites in AHSP which were subgrouped into major haplotype clades. No association between AHSP genotypes or haplotypes and clinical phenotypes was observed. Instead, multiple linear regression analysis indicated that expression of AHSP correlated negatively with age (P < 0.001) and hemoglobin (P = 0.007), but positively with reticulocyte count (P = 0.003) and severity score (P = 0.003). Subgroup analysis showed that AHSP expression was higher in the non-deletional form than in the deletional form (P < 0.001). Moreover, specific types of non-deletional HbH disease with production of mutant alpha-globin chains that do not bind to AHSP (Hb Constant Spring and Hb Pakse) showed the highest AHSP expression. The present findings demonstrate that AHSP expression is a biomarker of HbH disease severity and infer an important role of AHSP in modulating the pathophysiology of this disease. Pharmacological or genetic means to alter AHSP expression may be a novel approach for amelioration of disease severity in HbH disease.

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Titel: A molecular study on the role of alpha-hemoglobin-stabilizing protein in hemoglobin H disease
verfasst von: Pacharapan Surapolchai
Ampaiwan Chuansumrit
Nongnuch Sirachainan
Praguywan Kadegasem
Ka-Chun Leung
Chi-Chiu So
Publikationsdatum: 23.03.2017
Verlag: Springer Berlin Heidelberg
Erschienen in: Annals of Hematology / Ausgabe 6/2017
Print ISSN: 0939-5555
Elektronische ISSN: 1432-0584
DOI: https://doi.org/10.1007/s00277-017-2978-x

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