title: Different molecular defects of G gamma (A gamma delta beta)o-thalassaemia in Thailand.
abstract: DNA from members of 2 Thai families with conditions considered to be delta beta-thalassaemia were studied by using restriction endonuclease DNA mapping. The propositus in family A is a double heterozygote for beta-thalassaemia and delta beta-thalassaemia. DNA analysis reveals a deletion of the beta-globin gene cluster starting at the area between the Sac I and Eco RI sites near the 3' end of the G gamma-gene and extending through the A gamma-, delta- and beta-genes to an unknown extent downstream. In family B, the propositus is delta beta-thalassaemia/Hb E. Deletion of the beta-globin gene cluster begins in the large intervening sequence of the A gamma-gene and removes both delta- and beta-genes downstream.
mesh_terms: D002872:Chromosome Deletion; D005914:Globins / Q000235:genetics*; D006455:Hemoglobins, Abnormal / Q000032:analysis; D006579:Heterozygote; D006801:Humans; D007438:Introns; D012150:Polymorphism, Restriction Fragment Length; D013785:Thailand; D013789:Thalassemia / Q000235:genetics*
chemical_list: D006455:Hemoglobins, Abnormal; D005914:Globins