title: Molecular analysis distinguishes two HLA-DR3-bearing major histocompatibility complex extended haplotypes.
abstract: We detected restriction fragment length polymorphisms that distinguish the extended haplotype HLA-B8,DR3,SCO1 from HLA-B18,DR3,F1C3O at the DR beta and DQ beta loci with five of seven restriction endonucleases used. One set of restriction fragments was always found on HLA-B8,DR3,SCO1 and associated with DRw52a, while the other was present on HLA-B18, DR3,F1C3O and correlated with DRw52b (the gene encoding the subtype of DRw52 associated with the BO1 or LB-Q1 antigen). Furthermore, using a full-length DQ beta gene probe, we found division in the DQw2 haplotype, in which DQw2a always associated with HLA-B8, DR3,SCO1, while DQw2b always occurred with HLA-B18,DR3,F1C3O. Our evidence thus indicates that serologically defined HLA-DR3, HLA-DRw52, and HLA-DQw2 are each produced by two structurally very different sets of genes, one set occurring in HLA-B8, DR3,SCO1, and the other in HLA-B18,DR3,F1C3O.
mesh_terms: D000483:Alleles; D004247:DNA / Q000235:genetics; D005805:Genes, MHC Class I; D005819:Genetic Markers; D006681:HLA-D Antigens / Q000235:genetics*; D006684:HLA-DR Antigens / Q000235:genetics*; D006801:Humans; D009693:Nucleic Acid Hybridization; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length
chemical_list: D005819:Genetic Markers; D006681:HLA-D Antigens; D006684:HLA-DR Antigens; D004247:DNA