http://en.wikipedia.org/wiki/Ryanodine_receptor_2
Ryanodine receptor 2 (RYR2) is a protein found primarily in cardiac muscle. In humans, it is encoded by the RYR2 gene.
Mutations in the RYR2 gene are associated with Catecholaminergic polymorphic ventricular tachycardia, Stress-induced polymorphic ventricular tachycardia, and Arrhythmogenic right ventricular dysplasia.