The meta-analysis between BD and T2D identified six SNPs relevant for both traits (Table 4), three of which were located in the ALAS1 gene (best SNP: rs352165, p = 3.4E−08), two in intergenic regions and one in the KCNG1 gene (rs6091248, p = 4.3E−08). This evidence concerns the gene ALAS1 and type 2 diabetes mellitus.