In addition, patients with T1D and AITD share a common genetic background of HLA class II antigens DQ2 (DQA1*05:01- DQB1*02:01) and DQ8 (DQA1*03:01-DQB1*03:02) and overlapping functional single-nucleotide polymorphisms of various susceptibility genes involved in the immune regulation (10). Here, HLA-DQA1 is linked to type 1 diabetes mellitus.