PMID- 7729610 OWN - NLM STAT- MEDLINE DCOM- 19950531 LR - 20221207 IS - 0012-1797 (Print) IS - 0012-1797 (Linking) VI - 44 IP - 5 DP - 1995 May TI - DRB1*0403 protects against IDDM in Caucasians with the high-risk heterozygous DQA1*0301-DQB1*0302/DQA1*0501-DQB1*0201 genotype. Belgian Diabetes Registry. PG - 527-30 AB - The human leukocyte antigen (HLA) class II genotype DQA1*0301-DQB1*0302/DQA1*0501-DQB1*0201 has been identified as a marker strongly predisposing to insulin-dependent diabetes mellitus (IDDM) in Caucasian populations. Its frequency in control populations (1-3%) is still, however, 1 order of magnitude higher than the prevalence of IDDM, suggesting that its penetrance can be modified by protective factors. In this study we searched for such a factor in the DRB1 locus by studying DRB1*04 polymorphism in 174 European Caucasian IDDM patients and 73 nondiabetic control subjects, all sharing the HLA-DR3/DR4 phenotype. Significant protection was encoded by the DRB1*0403 allele, which was observed in 5 of 49 control subjects (10%) and none of 171 IDDM patients (0%) with the DQA1*0301-DQB1*0302/DQA1*0501-DQB1*0201 genotype (RR = 0.02 [0.01-0.18], P < 0.0005). These data support the concept that protective HLA class II genes can overrule the risk caused by HLA-DQ susceptibility dimers. They also contribute to a possible strategy to screen for nondiabetic individuals with increased genetic risk of developing IDDM. FAU - Van der Auwera, B AU - Van der Auwera B AD - Department of Biochemistry, Vrije Universiteit Brussel, Belgium. FAU - Van Waeyenberge, C AU - Van Waeyenberge C FAU - Schuit, F AU - Schuit F FAU - Heimberg, H AU - Heimberg H FAU - Vandewalle, C AU - Vandewalle C FAU - Gorus, F AU - Gorus F FAU - Flament, J AU - Flament J LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Diabetes JT - Diabetes JID - 0372763 RN - 0 (DNA Probes) RN - 0 (Genetic Markers) RN - 0 (HLA-DQ Antigens) RN - 0 (HLA-DQ alpha-Chains) RN - 0 (HLA-DQ beta-Chains) RN - 0 (HLA-DQA1 antigen) RN - 0 (HLA-DQB1 antigen) RN - 0 (HLA-DR Antigens) RN - 0 (HLA-DRB1 Chains) SB - IM MH - Alleles MH - Base Sequence MH - DNA Probes/genetics MH - Diabetes Mellitus, Type 1/*genetics/*immunology/prevention & control MH - Female MH - Gene Frequency MH - Genetic Markers MH - Genotype MH - HLA-DQ Antigens/genetics MH - HLA-DQ alpha-Chains MH - HLA-DQ beta-Chains MH - HLA-DR Antigens/*genetics MH - HLA-DRB1 Chains MH - Haplotypes MH - Heterozygote MH - Humans MH - Male MH - Molecular Sequence Data MH - Risk Factors MH - White People/genetics EDAT- 1995/05/01 00:00 MHDA- 1995/05/01 00:01 CRDT- 1995/05/01 00:00 PHST- 1995/05/01 00:00 [pubmed] PHST- 1995/05/01 00:01 [medline] PHST- 1995/05/01 00:00 [entrez] AID - 10.2337/diab.44.5.527 [doi] PST - ppublish SO - Diabetes. 1995 May;44(5):527-30. doi: 10.2337/diab.44.5.527.