Multiple genes have been found to cause LQTS and these include KCNQ1 (LQT1), KCNH2 (LQT2), SCN5A (LQT3), ANK2 (LQT4), KCNE1 (LQT5), KCNE2 (LQT6), KCNJ2 (LQT7), CACNA1C (LQT8), CAV3 (LQT9) and SCNB4 (LQT10). Here, KCNQ1 is linked to familial long QT syndrome.