These genes include KCNQ1 encoding for the Kv7.1 potassium channel (LQT1, 40–55%), KCNH2 (LQT2, 30–45%) encoding for the Kv11.1 potassium channel, and SCN5A (LQT3, 5–10%) that encodes for the Nav1.5 sodium channel. This evidence concerns the gene KCNH2 and long QT syndrome 3.