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July 8, 2026CirculationOpen Access

Mutation-Linked Defective Interdomain Interactions Within Ryanodine Receptor Cause Aberrant Ca 2+ Release Leading to Catecholaminergic Polymorphic Ventricular Tachycardia

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Key result

Dantrolene stops exercise-induced VT in RyR2 S2246L mutants by correcting erroneous Ca2+ channel activation.

Why the study?

The molecular mechanism by which catecholaminergic polymorphic ventricular tachycardia is induced by single amino acid mutations within the cardiac ryanodine receptor remains elusive.

Population

Knockin mouse model expressing human RyR2 mutant S2246L and knockin cardiomyocytes

Comparison

RyR2 S2246L mutant knockin mice or cardiomyocytes vs wild-type or dantrolene treatment

Design

Preclinical animal and cellular experimental study

Authors

TSTakeshi SuetomiBoston Biomedical Research InstituteMYMasafumi YanoHeart Failure & TransplantHUHitoshi UchinoumiYamaguchi University

Discussion

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Implication

Dantrolene suppressed VT in S2246L mice; hypothesis-generating for CPVT therapy, should not yet change practice.

Key Points

  • This research aims to elucidate how single amino acid mutations in the ryanodine receptor lead to catecholaminergic polymorphic ventricular tachycardia.
  • Utilized a knockin mouse model expressing the RyR2 S2246L mutant.
  • Examined Ca²⁺ spark frequency in saponin-permeabilized cardiomyocytes post-exercise.
  • Conducted binding assays with DP2246 to investigate interdomain interactions.
  • All knockin mice exhibited exercise-induced ventricular tachycardia.
  • Increased frequency of Ca²⁺ sparks observed in knockin cardiomyocytes (p<0.05).
  • Dantrolene administration corrected abnormal domain interactions and halted tachycardia.

Structured PICO

P
Population
Knockin mouse model expressing the human catecholaminergic polymorphic ventricular tachycardia-associated RyR2 mutant (S2246L) and saponin-permeabilized cardiomyocytes
E
Exposure
Dantrolene
C
Comparator
Wild-type mice/cardiomyocytes and untreated mutant mice
O
Outcome
Conformational defects of RyR2, Ca2+ spark frequency, and exercise-induced ventricular tachycardiasurrogate

The S2246L mutation in RyR2 causes CPVT through defective interdomain interactions that lead to aberrant diastolic Ca2+ release, a mechanism that can be reversed by dantrolene.

Cite This Study

Suetomi et al. (2011) studied Catecholaminergic polymorphic ventricular tachycardia. S2246L mutation in RyR2 vs. Wild-type was evaluated on Ventricular tachycardia after exercise and Ca2+ spark frequency. The S2246L mutation in RyR2 causes defective interdomain interactions leading to erroneous Ca2+ channel activation and exercise-induced ventricular tachycardia, which was stopped by dantrolene.

synapsesocial.com/papers/6a4e6a6ffc68164f0b3a4fd1https://doi.org/10.1161/circulationaha.111.023259

Topics

Ventricular arrhythmias
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Arrhythmogenic Mutation-Linked Defects in Ryanodine Receptor Autoregulation Reveal a Novel Mechanism of Ca <sup>2+</sup> Release Channel Dysfunction2005 · 83 citations
  2. 2Mice with the R176Q cardiac ryanodine receptor mutation exhibit catecholamine-induced ventricular tachycardia and cardiomyopathy2006 · 189 citations
  3. 3Defective Regulation of Interdomain Interactions Within the Ryanodine Receptor Plays a Key Role in the Pathogenesis of Heart Failure2005 · 152 citations
  4. 4Localization of a Disease-associated Mutation Site in the Three-dimensional Structure of the Cardiac Muscle Ryanodine Receptor2005 · 58 citations
  5. 5Localization of an NH2-terminal Disease-causing Mutation Hot Spot to the “Clamp” Region in the Three-dimensional Structure of the Cardiac Ryanodine Receptor2007 · 57 citations