Two haplotypes conferred susceptibility to T1D; the most highly frequent and significant haplotype was HLA-DRB1*03:01:01~HLA-DQA1*05:01:01~HLA-DQB1*02:01:01 and the least frequent among controls but significant haplotype was HLA-DRB1*04:05:01~HLA-DQA1*03:03:01~HLA-DQB1*03:02:01. This evidence concerns the gene HLA-DQA1 and type 1 diabetes mellitus.