Genome-wide association studies (GWAS) have shown that the risk A allele of rs864745, an intron variant in JAZF1, correlates with both type 1 (T1D) (12) in Europeans, and type 2 diabetes (T2D) (13) in various ethnicities, including Europeans, Americans, as well as Asians (11, 14–17). Here, JAZF1 is linked to type 1 diabetes mellitus.