CAMK2G and heart disorder: Acquired cardiac diseases associated with ventricular arrhythmias such as cardiac glycoside toxicity (152), alcoholic cardiomyopathy (153), heart failure, and myocardial hypertrophy appear to share a final common pathway: CaMKII-dependent RyR2 hyperphosphorylation with increased SR Ca2+ release (154–156), reduction of myofilament activator Ca2+, and proarrhythmia.