HLA-DQA1 and type 1 diabetes mellitus: The HLA-DQA1*05:01/DQB1*02:01 (DQ2.5) and HLA-DQA1*03:01/DQB1*03:02 (DQ8.1) alleles are positively associated with type 1 diabetes (T1D), while the HLA-DQA1*01:02/DQB1*06:02 (DQ6.2) allele is negatively associated with this disease [25,26,27].