The CPVT-associated R169Q RyR2 mutation increases ventricular arrhythmogenesis by enhancing RyR2 channel opening at low cytosolic calcium concentrations

Key Points

• This investigation aims to understand how the R169Q mutation in RyR2 affects arrhythmias in the heart.
• Utilized cellular models to study RyR2 channel behavior under varying calcium levels.
• Compared arrhythmia rates with and without the R169Q mutation present.
• R169Q mutation led to significantly increased arrhythmia rates at low calcium levels (p<0.001).
• Enhanced RyR2 channel opening observed, causing heightened arrhythmogenic potential.