Molecular study of alpha-thalassemia mutations in Iranian potential carriers
Abstract:
Background and ObjectivesThere is a large number of couples who are considered potential carriers of alpha or beta-thalassemia. The exact determination of gene defect for thalassemia carriers is essential for premarital screening genetic counseling. In this study, we conducted a molecular study of those suspected of carrying alpha-thalassemia mutated genes in order to detect potential deletional and non-deletional mutations in the alpha globin gene cluster. Materials and Methods In this study, those suspected of having mutation in alpha-globin gene cluster with MCV < 80 fl, MCH < 27 pg, normal serum iron, and HbA2 were selected from those referred to Pasteur Institute of Iran. Four common deletional mutations and non-deletional mutations were studied using multiplex gap-PCR, ARMS-PCR, and direct sequencing. ResultsOne hundred and forty samples with above criteria entered the study with 126 (90%) cases showing at least one mutation. Study of 4 common deletional mutations using multiplex gap-PCR revealed at least one deletion in 99 (70.71%) cases. Non-deletional mutations were found using ARMS-PCR or direct sequencing in 27 (19.28%) cases. Nine different mutations were found in the samples with –α3.7 being the most common deletion in 100 (35.71%) alleles out of 280 studied chromosomes followed by -α5nt in 25 (8.93%) alleles as the next most common. ConclusionsWe used direct sequencing to characterize more suspected carriers of alpha thalassemia. However, using other methods like real-time PCR and multiplex ligation-dependent probe amplification (MLPA) for gene dosage study of alpha-globin gene cluster could help find other non-common deletions.
Language:
Persian
Published:
Scientific Journal of Iranian Blood Transfusion Organization, Volume:7 Issue: 2, 2010
Page:
70
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