title: HLA associations in insulin-dependent diabetes mellitus: no independent association to particular DP genes.
abstract: Genes in the HLA complex are associated with susceptibility to develop insulin-dependent diabetes mellitus (IDDM). Several studies, from different populations, have demonstrated strong associations between particular DR and DQ alleles and disease susceptibility or protection. Whether also particular DP alleles may independently contribute is more controversial. Some studies have found a greater frequency of DPB1*0301 among IDDM patients compared to controls, apparently independently of linkage disequilibrium with high risk DR and DQ alleles. To address this question in an ethnically homogeneous population (Norwegian), we have DPA1 and DPB1 genotyped 237 IDDM patients and 287 DRB1-DQA1-DQB1 matched controls, carrying high risk DR3/4 or DR4/4 genotypes. We were unable to detect any significant independent associations between DP alleles and IDDM susceptibility or protection in this population. Thus, our results do not support previous reports on an independent association between some DP alleles and susceptibility to develop IDDM.
authors.affiliation: Institute of Transplantation Immunology, National Hospital, Oslo, Norway.
authors.forename: B A
authors.initials: BA
authors.lastname: Lie
authors.forename: H E
authors.initials: HE
authors.lastname: Akselsen
authors.forename: G
authors.initials: G
authors.lastname: Joner
authors.forename: K
authors.initials: K
authors.lastname: Dahl-Jørgensen
authors.forename: K S
authors.initials: KS
authors.lastname: Rønningen
authors.forename: E
authors.initials: E
authors.lastname: Thorsby
authors.forename: D E
authors.initials: DE
authors.lastname: Undlien
mesh_terms: D000483:Alleles; D002648:Child; D003922:Diabetes Mellitus, Type 1 / Q000276:immunology*; D006682:HLA-DP Antigens / Q000235:genetics*; D059867:HLA-DP alpha-Chains; D059868:HLA-DP beta-Chains; D006683:HLA-DQ Antigens / Q000235:genetics; D006801:Humans
chemical_list: D006682:HLA-DP Antigens; D059867:HLA-DP alpha-Chains; D059868:HLA-DP beta-Chains; C071172:HLA-DPA1 antigen; C071170:HLA-DPB1 antigen; D006683:HLA-DQ Antigens