TCF7L2 and type 2 diabetes mellitus: The per-allele association of IGF2BP2 (rs1470579) for affecting blood 25(OH)D concentration was Beta ± SE (0.0058, 0.005) P= 0.20, Z score = 1.29 (Supplementary Table 2). The per allele effect for TCF7L2 (rs7903146) for affecting blood 25(OH)D concentration was marginally significant Beta ± SE (-0.011, 0.005), P= 0.02, Z score = -2.30, and no association was observed in KCNQ1 (rs2237896) with 25(OH)D concentration Beta ± SE (-0.005, 0.01]), P= 0.26, Z score = -1.18 after adjusting for age, gender, and T2D (Supplementary Table 2).