Notably, some genes that cause LQTS are the same genes that also cause SQTS (KCNQ1, KCNH2, KCNJ2, CACNA1C, CACNB2, and CACNA2D1), CPVT (CALM1, CALM2, CALM3, TRDN, KCNJ2, SCN5A, ANK2 and TECRL) or BrS (SCN5A) [42,89]. The gene discussed is KCNJ2; the disease is familial long QT syndrome.