Key result
Sodium channel β1 and β3 subunit mutations disrupt NaV1.5 function, promoting inherited arrhythmias.
Why the study?
New structural insights into regulatory β1 and β3 subunits have raised new questions about the physiological function and regulation of the cardiac Na V 1.5 channel.
Highlights the distinct structure-function relationships of β1 and β3 subunits with NaV1.5 in healthy and arrhythmic states.
Answers are grounded in this paper and cite their sources.
May inform β-subunit genotyping in inherited arrhythmia panels; leaves open causal mechanisms and therapeutic targeting.
In cardiac myocytes, the voltage‐gated sodium channel Na V 1.5 opens in response to membrane depolarisation and initiates the action potential. The Na V 1.5 channel is typically associated with regulatory β‐subunits that modify gating and trafficking behaviour. These β‐subunits contain a single extracellular immunoglobulin (Ig) domain, a single transmembrane α‐helix and an intracellular region. Here we focus on the role of the β1 and β3 subunits in regulating Na V 1.5. We catalogue β1 and β3 domain specific mutations that have been associated with inherited cardiac arrhythmia, including Brugada syndrome, long QT syndrome, atrial fibrillation and sudden death. We discuss how new structural insights into these proteins raises new questions about physiological function.
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Salvage et al. (2022) conducted a review in Inherited cardiac arrhythmias. Mutations in β1 and β3 subunits vs. Wild-type subunits was evaluated on NaV1.5 channel function and arrhythmic phenotypes. Domain-specific mutations in β1 and β3 subunits disrupt NaV1.5 channel gating and trafficking, contributing to inherited arrhythmias like Brugada syndrome, long QT syndrome, and atrial fibrillation.
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