TNNI3 and cardiomyopathy, familial restrictive, 1: Recent studies have shown that sarcomeric mutations in troponin I (TNNI3), myosin‐binding protein (MYBPC3), β‐myosin heavy chain (MYH7), myosin light chain genes (MYL3), troponin T (TNNT2),α‐cardiac actin, troponin C (TNNC1), tropomyosin 1 and myosin light chain (MYL3 and MYL2), and nonsarcomeric mutations in filamin‐C and desmin (DES) are contributed to the pathogenesis of RCM.21, 22, 23, 24, 25, 26