(4) In the colocalization analysis of T2DM, the results indicate that APOE, JAG1, MCL1, PTPN9, PIP4K2A, SNUPN, and RAB1A may share a causal variant in the region associated with T2DM (PPH3 + PPH4 > 0.8). This evidence concerns the gene RAB1A and type 2 diabetes mellitus.