Analysis of Gγ-158(C→T) polymorphism in hemoglobin E/β-thalassemia major in Southern China
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The Gγ-158(C→T) polymorphism plays important function in the clinical variability of HbE/β-thalassemia. There is little known about Gγ-158(C→T) polymorphism in HbE/β-thalassemia major in Southern China. This study aimed to explore the association between HbE/β-thalassemia major and this polymorphism in Southern China.
Methods and Results
The frequency of the Gγ-158(C→T) polymorphism has been evaluated in 32 patients with HbE/β-thalassemia major from Southern China. Further analysis of the Gγ-158(C→T) polymorphism revealed the prominent frequency of this polymorphic pattern among HbE/β-thalassemia major patients (65.63%). The presence of this polymorphism was strongly correlated with the increase of HbF synthesis.
The frequency of the Gγ-158(C→T) polymorphism was relatively high in Southern Chinese patients with HbE/β-thalassemia major, often accompanying with high production of HbF. This feature appears to be different with reports in other races and regions.
KeywordsThalassemia Gamma Chain High Gamma Polymorphic Pattern Unrelated Healthy Individual
To the Editor
Hemoglobin E/β-thalassemia(HbE/β-thalassemia) is a common form of severe thalassemia syndromes in the Southern Chinese provinces. Clinical manifestations of these patients range from nearly asymptomatic to severe β-thalassemia disease. The Gγ-158(C→T) polymorphism (- 158 Xmn I Gγ-globin polymorphism) has been shown to be associated with the increased production of HbF and can strongly influence this heterogeneity of HbE/β-thalassemia[1, 2, 3, 4, 5, 6]. The condition of the - 158 Xmn I Gγ-globin polymorphism has been rarely reported in HbE/β-thalassemia majors from Southern China. The present study was to investigate the frequency of the - 158 Xmn I Gγ-globin polymorphism and its association with high HbF level in HbE/β-thalassemia major patients of the Southern Chinese.
Existence of the -158 Xmn I Gγ-globin polymorphism among 32 HbE/β-thalassemia major and 30 healthy controls
-158 Xmn I Gγ-globin
Xmn I +/+
Xmn I +/-
Xmn I -/-
In HbE/β-thalassemia, particularly in the major cases, during hematopoietic stress, point mutation at G-gamma promoter (the - 158 Xmn I Gγ-globin polymorphism) can induce high gamma chain production rate. The heavy hematopoietic stress from severe anemia may thus leads to the high frequency of this polymorphism in Southern Chinese patients with HbE/β-thalassemia major. This is the first report of the frequency of the - 158 Xmn I Gγ-globin polymorphism in patients with HbE/β-thalassemia major in Southern China. These data suggest that screening of the - 158 Xmn I Gγ-globin polymorphism and HbF level in early childhood may help on the management of HbE/β-thalassemia major patients and possibly prevent severe complications in Southern China.
We are grateful to the investigators, Wei-Xiong Lin, and Yi-Dan Liang, Xuan Xiao for their technical assistance. This work was surported by grants from the National Natural Science Foundation of China (No. 30860307).
- 5.Dedoussis GV, Mandilara GD, Boussiu M: HbF production in beta thalassaemia heterozygotes for the IVS-II-1 G-- > A beta(0)-globin mutation. Implication of the haplotype and the (G)gamma-158 C-- > T mutation on the HbF level. Am J Hematol. 2000, 64: 151-5. 10.1002/1096-8652(200007)64:3<151::AID-AJH2>3.0.CO;2-X.CrossRefPubMedGoogle Scholar
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