KCNJ2 and Cardiodysrhythmic potassium-sensitive periodic paralysis: The level of evidence for the gene KCNJ2 was only limited for the cardio-specific phenotype of LQTS, whereas both genes (CACNA1C and KCNJ2) were classified to have definitive evidence for causing multiorgan syndromes (respectively: Timothy syndrome and Andersen-Tawil syndrome).