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Since the discovery of triadin &gt;20 years ago as one of the major proteins located in the junctional sarcoplasmic reticulum, the field has come a long way in understanding the pivotal role of triadin in orchestrating sarcoplasmic reticulum Ca(2+)-release and hence excitation-contraction (EC) coupling. Building on the information gathered from earlier lipid bilayer and myocyte overexpression studies, the gene-targeted ablation of Trdn demonstrated triadin's indispensable role for maintaining the structural integrity of the couplon. More recently, the discovery of inherited and acquired diseases displaying altered expression and function of triadin has further emphasized the role of triadin in health and disease. Novel therapeutic approaches could be aimed at correcting the loss of triadin in diseased hearts, and thereby correcting the sub-cellular EC coupling defect. This review summarizes current concepts of the impact of triadin on cardiac EC coupling with a focus towards triadin's role for ventricular arrhythmia.

Triadin regulates cardiac muscle couplon structure and microdomain Ca2+ signalling: a path towards ventricular arrhythmias