Arrhythmogenic Mechanism of an LQT-3 Mutation of the Human Heart Na + Channel α-Subunit
Key result
The D1790G mutation of the Na+ channel alpha-subunit prolongs the cardiac ventricular action potential in a calcium-dependent manner, triggering early afterdepolarizations at slow heart rates.
Population
Computational model of the cardiac ventricular action potential incorporating patch-clamp data of D1790G…
Comparison
D1790G mutation of the Na+ channel alpha-subunit vs Control cardiac ventricular action potential model
Design
Preclinical
Authors
Discussion
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Member takes
Implication
Hypothesis-generating for calcium-dependent LQT-3 mechanisms in models; leaves open human translation and therapeutic targeting.
Structured PICO
P
Population
Computational model of the cardiac ventricular action potential (Luo and Rudy model) incorporating patch-clamp data of D1790G mutated voltage-gated Na+ channels
E
Exposure
D1790G mutation of the Na+ channel alpha-subunit
C
Comparator
Control cardiac ventricular action potential model (Luo and Rudy)
O
Outcome
Cardiac ventricular action potential (AP) prolongation and early afterdepolarizationssurrogate
The D1790G mutation causes LQT-3 by prolonging the action potential and triggering early afterdepolarizations at slow heart rates through modulation of calcium-sensitive exchange and ion channel currents, rather than sustained Na+ current.
Cite This Study
Wehrens et al. (2000) studied Congenital long-QT syndrome (LQT-3). D1790G mutation of SCN5A vs. Control (Luo and Rudy parameters) was evaluated on Cardiac ventricular action potential (AP) prolongation and early afterdepolarizations. The D1790G mutation of the Na+ channel alpha-subunit prolongs the cardiac ventricular action potential in a calcium-dependent manner, triggering early afterdepolarizations at slow heart rates.