Polymorphism analysis in the COLIA1 gene of patients with thalassemia major and intermedia

beta-Thalassemia, an inherited blood disorder, mainly affects people from the Mediterranean region. This life-threatening anemia is so severe that regular blood transfusions and iron-chelating therapy is obligatory throughout life. Commonly occurring complications, especially in adult patients, are...

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Bibliographic Details
Published in:Haematologia 2002, Vol.32 (4), p.475-482
Main Authors: Arisal, O, Deviren, A, Fenerci, E Yosunkaya, Hacihanefioglu, S, Ulutin, T, Erkmen, S, Buyru, N
Format: Article
Language:English
Subjects:
Adult
Base Sequence
beta-Thalassemia - complications
beta-Thalassemia - genetics
beta-Thalassemia - metabolism
Binding Sites - genetics
Bone Density - genetics
Bone Diseases, Metabolic - etiology
Bone Diseases, Metabolic - genetics
Bone Diseases, Metabolic - metabolism
Collagen Type I - genetics
DNA - genetics
DNA - metabolism
Female
Humans
Male
Osteoporosis - etiology
Osteoporosis - genetics
Osteoporosis - metabolism
Polymorphism, Genetic
Sp1 Transcription Factor - metabolism
Thalassemia - complications
Thalassemia - genetics
Thalassemia - metabolism
Turkey
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Summary:beta-Thalassemia, an inherited blood disorder, mainly affects people from the Mediterranean region. This life-threatening anemia is so severe that regular blood transfusions and iron-chelating therapy is obligatory throughout life. Commonly occurring complications, especially in adult patients, are osteopenia and osteoporosis. Osteoporotic fractures are strongly associated with bone density, which is under polygenic control. Type I collagen, which is encoded by the COLIA1 and COLIA2 genes, is the major protein in the bone. A G-->T polymorphism in the regulatory region of the COLIA1 gene at a recognition site for transcription factor Sp1 has been strongly associated with osteoporotic fractures. In this study, the G-->T polymorphism is screened in 42 beta-thalassemia major and 10 beta-thalassemia intermedia patients. 64.3% of the beta-thalassemia patients were heterozygotes for G/T (Ss) polymorphism and 35.7% were homozygous for G/G (SS), 60% of the beta-thalassemia intermedia patients were heterozygous (Ss) and 40% were homozygous (ss). The number of heterozygotes in the beta-thalassemia major group was significantly higher, compared to the control group (F = 13.615, P = 0.001). The number of heterozygotes in beta-thalassemia intermedia group was also significantly higher, compared to the control group (F = 5.158, P = 0.029). Patients who are G/T heterozygotes (Ss) at the polymorphic Sp1 site have a lower bone mineral density than G/G homozygotes (SS) (P = 0.01).
ISSN:0017-6559