HLA-DRB1 and diabetes mellitus: Other examples are that specific HLA-DQ alleles are associated with disease-specific transglutaminase 2 antibodies in celiac disease (6); HLA-DRB1*0401 is strongly associated with autoantibodies against insulin and islet antigen 2 proteins (7); while the HLA class II haplotype HLA-DRB1*03-DQB1*02 is associated with glutamic acid decarboxylase antibodies in type 1 diabetes mellitus (8).