Triadin (TRDN)

Triadin is an integral membrane protein primarily located in the sarcoplasmic reticulum of skeletal and cardiac muscle, encoded by the TRDN gene. It is essential for excitation–contraction coupling as a structural and functional component of the calcium release complex, forming a physical and regulatory link between the ryanodine receptor (RyR1/RyR2), calsequestrin (CASQ1/2), and junctin proteins[1][2][3][4]. Triadin exists in several isoforms (e.g., Trisk 95, Trisk 51, Trisk 49, Trisk 32) generated through alternative splicing; these isoforms have distinct tissue distributions and roles. Triadin is required for normal muscle contraction, sensing and transmitting luminal calcium concentrations, and maintaining the structural organization of the sarcoplasmic reticulum. Mutations in the TRDN gene lead to severe disorders such as catecholaminergic polymorphic ventricular tachycardia (CPVT5), cardiac arrhythmia syndromes, and congenital myopathy characterized by muscle weakness and, in severe cases, sudden cardiac death. There are currently no known drugs that directly modulate triadin, but genetic testing for TRDN mutations is significant in the clinical evaluation of inherited cardiac arrhythmia disorders[1][2][3][4].

Other names

TriadinTRDNTrisk 95Trisk 51Trisk 49Trisk 32TRISKtriadin in skeletal muscleCARDARCPVT5TDNtriadin in cardiac muscle

Not established for direct-targeting drugs; drugs act by modulating downstream effects (e.g., arrhythmia prevention)[3].