Key genes that have been reported to be associated with T2D-related phenotypes are transcription factor family 7, member 2 (TCF7L2), peroxisome proliferator-activated receptor gamma (PPARG), and potassium voltage-gated channel subfamily J, member 11 (KCNJ11) (Franks, 2012). The gene discussed is KCNJ11; the disease is type 2 diabetes mellitus.