Arab A, Karimipoor M, Rajabi A, Hamid M, Arjmandi S, Zeinali S. Molecular characterization of β-thalassemia intermedia: a report from Iran.
Mol Biol Rep 2010;
38:4321-6. [PMID:
21120615 DOI:
10.1007/s11033-010-0557-5]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Accepted: 11/17/2010] [Indexed: 10/18/2022]
Abstract
Thalassemia intermedia is a clinical definition applied to patients whose clinical phenotype is milder than thalassemia major. To characterize different common mechanisms involving in pathogenesis of moderate to severe β-thalassemia intermedia, we have studied four factors in 38 Iranian patients with thalassemia intermedia: β-globin gene mutation, deletion in α-globin genes, presence of XmnI polymprphism and RFLP haplotype at β-globin gene cluster. The results showed that 84.4% of patients were associated with severe mutations in β-globin gene, mainly IVSII-1(G to A) (56.4%). The positive XmnI polymorphism was seen in 76.9% of the studied alleles which showed strong linkage to β° mutations and high level of fetal hemoglobin. Co-existence of α-globin gene deletions, β(+) mutation and the most frequent of RFLP haplotype (-/-, +/+, -/+, +/+, +/+, +/+, -/-) were seen in 7.7, 12.8 and 17.9%, respectively. In this group of our study it seems the main ameliorating factor in the patients was co-inheritance of a positive XmnI polymorphism with β° mutation especially IVSII-1, which were associated with increased production of fetal hemoglobin. However, the other probable genetic factors should be investigated to describe genotype-phenotype correlation in thalassemia intermedia patients.
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