The majority of these studies have been performed in T2D; however, some targets were associated with T1D in candidate gene studies, such as peroxisome proliferator-activated receptor gamma (PPARG), neuropeptide Y receptor 2 (NPY2R), centrosomal protein (CEP)-135 (CEP135), and plexin domain containing 2 (PLXDC2). Here, CEP135 is linked to type 2 diabetes mellitus.