Troponin I (TnI), along with troponin T (TnT) and troponin C (TnC), is one of 3 subunits that form the troponin complex of the thin filaments of striated muscle. TnI is the inhibitory subunit, blocking actin-myosin interactions and thereby mediating striated muscle relaxation. The TnI subfamily contains three genes: TnI-skeletal-fast-twitch, TnI-skeletal-slow-twitch, and TnI-cardiac. This gene encodes the TnI-cardiac protein and is exclusively expressed in cardiac muscle tissues. Mutations in this gene cause familial hypertrophic cardiomyopathy type 7 (CMH7) and familial restrictive cardiomyopathy (RCM).,TNNI3,CMD1FF,CMD2A,CMH7,RCM1,TNNC1,cTnI,troponin I3,Signal Transduction,Cell Biology & Developmental Biology,Cytoskeleton,Microfilaments,Stem Cells,Cardiovascular,Cardiovascular Markers,Cardiomyocytes,Angiogenesis,Heart,Contractility,TNNI3