Determination of beta S haplotypes in patients with sickle-cell anemia in the state of Rio Grande do Norte, Brazil

βS haplotypes were studied in 47 non-related patients with sickle-cell anemia from the state of Rio Grande do Norte, Brazil. Molecular analysis was conducted by PCR/RFLP using restriction endonucleases XmnI, HindIII, HincII and HinfI to analyze six polymorphic sites from the beta cluster. Twenty-seven patients (57.5 percent) were identified with genotype CAR/CAR, 9 (19.1 percent) CAR/BEN, 6 (12.8 percent) CAR/CAM, 1 (2.1 percent) BEN/BEN, 2 (4.3 percent) CAR/Atp, 1 (2.1 percent) BEN/Atp and 1 (2.1 percent) with genotype Atp/Atp. The greater frequency of Cameroon haplotypes compared to other Brazilian states suggests the existence of a peculiarity of African origin in the state of Rio Grande do Norte.