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- W4249747881 startingPage "1817" @default.
- W4249747881 abstract "An atypical sickle cell trait with a very low level of hemoglobin S and features of heterozygous beta-thalassemia was recently described. In vitro globin chain synthesis strongly suggested the presence of the two abnormalities on the same chromosome. We report the corresponding beta S-thal gene. DNA sequence revealed a C----T base substitution in the distal promoter element CACCC, at position-88 from the cap site, in addition to the expected GAG----GTG mutation responsible for the structural variant (beta 6 Glu----Val). Reticulocyte mRNA titration and transient assay of the mutant gene in COS cells showed a defect in beta- mRNA production. Restriction haplotype and DNA sequence analyses revealed that the doubly mutated gene is associated with haplotype 19 (or Benin/Algeria haplotype). In particular, we found the (AT)9(T)4 repeated sequences specifically encountered 5′ to the beta S gene of Benin Algeria type. These results support the view that the beta S-thal gene resulted from an independent thalassemic mutation having occurred on a beta S chromosome rather than (a) from a beta S mutation having altered a beta-thalassemic gene or (b) from a recombination event between two chromosomes, each carrying one of the mutations." @default.
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- W4249747881 date "1989-10-01" @default.
- W4249747881 modified "2023-10-16" @default.
- W4249747881 title "Beta+-thalassemia in cis of a sickle cell gene: occurrence of a promoter mutation on a beta s chromosome" @default.
- W4249747881 doi "https://doi.org/10.1182/blood.v74.5.1817.bloodjournal7451817" @default.
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