title: Partial deletion of beta-globin gene DNA in certain patients with beta 0-thalassemia.
abstract: We have used restriction endonuclease mapping of cell DNA to investigate the structure of the beta-globin gene in beta-thalassemias. Among 17 individuals with beta +- and beta 0-thalassemia, we observed three patients of Indian origin with beta 0-thalassemia whose DNA revealed a consistent mapping abnormality. In one beta allele in each diploid cell, 0.6 kilobase of DNA was deleted from  beta-specific Pst I and Bgl II restriction fragments. This deletion involved 3' beta-globin gene sequences and eliminated the EcoRI site normally present at codons 121/122, but it did not extend to the BamHI site at codons 98--100 on the 5' side of the 0.90-kilobase intervening sequence normally present in beta-globin genes. Partial beta-globin gene deletion appears, therefore, to be a primary molecular defect seen in certain patients with beta 0-thalassemia.
mesh_terms: D001483:Base Sequence; D002869:Chromosome Aberrations / Q000235:genetics*; D002872:Chromosome Deletion; D025063:Chromosome Disorders; D004247:DNA / Q000235:genetics; D004262:DNA Restriction Enzymes; D004274:DNA, Recombinant; D005796:Genes; D005914:Globins / Q000235:genetics*; D006801:Humans; D008970:Molecular Weight; D013789:Thalassemia / Q000235:genetics*
chemical_list: D004274:DNA, Recombinant; D005914:Globins; D004247:DNA; D004262:DNA Restriction Enzymes