Catecholaminergic polymorphic ventricular tachycardia (CPVT) associated with SCD (Wehrens & Marks 2003, Francis et al. 2005, George et al. 2007), has been linked to mutations in the gene encoding the ryanodine receptor (RyR2)-sarcoplasmic reticular Ca2+ release channel (Swan et al. 1999, Priori et al. 2001). The gene discussed is RYR2; the disease is Schnyder corneal dystrophy.