KCNH2 and Familial short QT syndrome: Six genes encoding potassium channels (KCNH2, KCNQ1, KCNJ2) and calcium channels (CACNA1C, CACNB2, CACNA2D1), which are causative genes of other ion channelopathies, have been found to be associated with SQTS (Mazzanti et al., 2014).