BTN3A1 and type 1 diabetes mellitus: A GWAS in a Chinese Han population reported five independent susceptibility loci strongly associated with T1D, namely rs4320356 near the BTN3A1 gene, rs3802604 in the GATA3 gene, rs1770 in the MHC gene, rs705699 in the SUOX gene, and HLA-C 275 [26].