Mechanisms of Abnormal Calcium Homeostasis in Mutations Responsible for Catecholaminergic Polymorphic Ventricular Tachycardia
Key result
Simulated CSQN2 and RyR2 mutations in a human ventricular myocyte model demonstrated that impaired luminal Ca2+ sensing and reduced cooperativity of RyR2 activation lead to delayed afterdepolarizations.
Population
Simulated model of the human ventricular myocyte incorporating mutations in calsequestrin and ryanodine…
Design
Preclinical
Authors
Discussion
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Implication
Informs cellular CPVT mechanisms in models; leaves open validation and therapeutic translation in patients.
Structured PICO
P
Population
Simulated model of the human ventricular myocyte incorporating mutations in calsequestrin (CSQN2) and ryanodine receptor (RyR2) linked to catecholaminergic polymorphic ventricular tachycardia
I
Intervention
Simulation of disrupted RyR2 luminal Ca2+ sensing (for CSQN2 mutations) and reduced cooperativity of RyR2 activation (for RyR2 mutations)
O
Outcome
Mechanistic basis for spontaneous Ca2+ release events leading to delayed afterdepolarizationssurrogate
Computational modeling of CSQN2 and RyR2 mutations reveals that impaired RyR2 gating mechanisms lead to delayed afterdepolarizations, explaining the cellular triggers for catecholaminergic polymorphic ventricular tachycardia.
Cite This Study
Iyer et al. (2007) studied Catecholaminergic polymorphic ventricular tachycardia. Simulated CSQN2 and RyR2 mutations was evaluated on Mechanistic basis for spontaneous Ca2+ release events leading to delayed afterdepolarizations. Simulated CSQN2 and RyR2 mutations in a human ventricular myocyte model demonstrated that impaired luminal Ca2+ sensing and reduced cooperativity of RyR2 activation lead to delayed afterdepolarizations.