The field of HLA expression and its relationship with disease risk is still in early stages; however, a haplotype of three SNPs in a short region of exon 1 of the DRA gene was shown to be associated with T1D in individuals homozygous for the DRB1*03:01~DQA1*05:01~DQB1*02:01 haplotype (125). Here, SLC26A3 is linked to type 1 diabetes mellitus.