title: Association of HLA-DPB1*0301 with IDDM in Mexican-Americans.
abstract: Susceptibility to IDDM has been associated with specific alleles at the HLA class II loci in a variety of human populations. Previous studies among Mexican-Americans, a group ancestrally derived from Native Americans and Hispanic whites, showed that the DR4 haplotypes (DRB1*0405-DQB1*0302 and DRB1*0402-DQB1*0302) and the DR3 haplotype (DRB1*0301-DQB1*0201) were increased among patients and suggested a role for both DR and DQ alleles in susceptibility and resistance. Based on the analysis of 42 Mexican-American IDDM families and ethnically matched control subjects by polymerase chain reaction/sequence-specific oligonucleotide probe typing, we report an association of IDDM with the DPB1 allele, *0301 (relative risk = 6.6; P = 0.0012) in this population. The analysis of linkage disequilibrium patterns in this population indicates that the observed increased frequency in DPB1*0301 among patients cannot be attributed simply to linkage disequilibrium with high-risk DR-DQ haplotypes. These data suggest that in addition to alleles at the DRB1 and DQB1 loci, polymorphism at the DPB1 locus may also influence IDDM risk.
authors.affiliation: Department of Human Genetics, Roche Molecular Systems, Alameda, CA 94501, USA.
authors.forename: H A
authors.initials: HA
authors.lastname: Erlich
authors.forename: J I
authors.initials: JI
authors.lastname: Rotter
authors.forename: J D
authors.initials: JD
authors.lastname: Chang
authors.forename: S J
authors.initials: SJ
authors.lastname: Shaw
authors.forename: L J
authors.initials: LJ
authors.lastname: Raffel
authors.forename: W
authors.initials: W
authors.lastname: Klitz
authors.forename: T L
authors.initials: TL
authors.lastname: Bugawan
authors.forename: A
authors.initials: A
authors.lastname: Zeidler
mesh_terms: D002461:Cell Line, Transformed; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics* / Q000276:immunology*; D006682:HLA-DP Antigens / Q000235:genetics*; D059868:HLA-DP beta-Chains; D015804:HLA-DR4 Antigen / Q000235:genetics; D006239:Haplotypes; D006801:Humans; D015810:Linkage Disequilibrium; D008214:Lymphocytes / Q000276:immunology; D017058:Mexican Americans / Q000235:genetics; D010375:Pedigree; D016133:Polymerase Chain Reaction; D012016:Reference Values
chemical_list: D006682:HLA-DP Antigens; D059868:HLA-DP beta-Chains; C071170:HLA-DPB1 antigen; D015804:HLA-DR4 Antigen