HLA-DRB1 and type 1 diabetes mellitus: In the Northern Indian population, HLA-DRB1*03, DQA1*05, and DQB1*02 were associated with T1D, while worldwide in Caucasians HLA-DR4 (DRB1*04:01/04/05) and DQ8 (DQA1*03:01-DQB1*03:02) are associated with T1D.