title: Genomic evaluation of HLA-DR3+ haplotypes associated with type 1 diabetes.
abstract: We have defined three sets of HLA-DR3(+) haplotypes that provide maximum risk of type 1 disease development in Indians: (1) a diverse array of B8-DR3 haplotypes, (2) A33-B58-DR3 haplotype, and (3) A2-B50-DR3 occurring most predominantly in this population. Further analysis has revealed extensive diversity in B8-DR3 haplotypes, particularly at the HLA-A locus, in contrast to the single fixed HLA-A1-B8-DR3 haplotype (generally referred to as AH8.1) reported in Caucasians. However, the classical AH8.1 haplotype was rare and differed from the Caucasian counterpart at multiple loci. In our study, HLA-A26-B8-DR3 (AH8.2) was the most common B8-DR3 haplotype constituting >50% of the total B8-DR3 haplotypes. Further, A2-B8-DR3 contributed the maximum risk (RR = 48.7) of type 1 diabetes, followed by A2-B50-DR3 (RR = 9.4), A33-B58-DR3 (RR = 6.6), A24-B8-DR3 (RR = 4.5), and A26-B8-DR3 (RR = 4.2). Despite several differences, the disease-associated haplotypes in Indian and Caucasian populations share a frozen DR3-DQ2 block, suggesting a common ancestor from which multiple haplotypes evolved independently.
authors: Department of Transplant Immunology and Immunogenetics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India.
authors: Neeraj
authors: N
authors: Kumar
authors: Gurvinder
authors: G
authors: Kaur
authors: Nikhil
authors: N
authors: Tandon
authors: Uma
authors: U
authors: Kanga
authors: Narinder K
authors: NK
authors: Mehra
mesh_terms: D003922:Diabetes Mellitus, Type 1 / Q000235:genetics* / Q000276:immunology*; D023281:Genomics / Q000379:methods; D015234:HLA-A Antigens / Q000235:genetics; D015803:HLA-DR3 Antigen / Q000235:genetics*; D006239:Haplotypes; D006801:Humans; D007194:India; D012307:Risk Factors
chemical_list: D015234:HLA-A Antigens; C039683:HLA-A*26 antigen; D015803:HLA-DR3 Antigen