Additionally, rs2191349 in DGKB, rs1799884 and rs4607517 in GCK, and rs11558471 in SLC30A8 were nominally associated with IFG and type 2 diabetes (p = 0.011, 0.027, 0.045, and 0.002, respectively) after adjusting for age, sex, and BMI. This evidence concerns the gene GCK and type 2 diabetes mellitus.