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Objective: Four combinations of five neutral sequence changes at rs713040, rs10768683, rs7480526, rs7946748, and rs1609812 occurring in the human beta globin gene defined as frameworks have been reported in beta globin gene. Here we report for the frequency of these frameworks in thalassemia major patients of North Iran. Methods: Beta globin gene frameworks of 46 thalassemia major patients of North Iran were determined using Denaturing Gradient Gel Electrophoresis. Findings: All these frameworks called framework 1, 2, 3, 3a were present at the frequency of 23.9%, 45.7%, 6.5% and 23.9% respectively. Conclusion: These frameworks may be used for tracking mutant alleles in prenatal diagnosis programs. [ABSTRACT FROM AUTHOR]

Objective: Prenatal diagnosis of β-thalassemia carrier couples has helped to prevent bearing affected children. Among 177 couples referred to our laboratory for prenatal diagnosis, 14 mothers had twin pregnancies. Methods: By using direct and indirect methods, we determined their mutations and linkage analysis using polymorphic markers (restriction fragment length polymorphism [RFLP]). Results: It was shown that in five families both fetuses were heterozygote carriers. In another five families, one fetus was normal and the other one was carrier. In two families, one fetus was affected and the other one was heterozygous carrier; in one case one fetus was affected and the other one was homozygote normal. In the last family both fetuses were homozygote normal. If all fetuses were fraternal then one would expect to see seven homozygote normal and the same number affected, and 14 carriers. Conclusion: Our results indicated that at least in cases where both fetuses had identical genotypes, then they may be identical twins. Molecular testing indeed showed that in three cases the twins were identical. Another point is that in three cases, one of the twin fetuses was affected and the other one was either normal or heterozygote in which only the affected fetuses were aborted by the specialist. [ABSTRACT FROM AUTHOR]