CASQ2 (Calsequestrin 2): CASQ2 is involved in calcium storage within the sarcoplasmic reticulum of cardiac muscle cells. It plays a critical role in regulating calcium homeostasis and cardiac muscle contraction. Mutations in CASQ2 are linked to catecholaminergic polymorphic ventricular tachycardia, a condition that causes irregular heartbeats in response to physical activity or stress....