Abstract
Voltage-gated sodium channels are protein complexes comprised of one pore forming α subunit and two, non-pore forming, β subunits. The voltage-gated sodium channel β subunits were originally identified to function as auxiliary subunits, which modulate the gating, kinetics, and localization of the ion channel pore. Since that time, the five β subunits have been shown to play crucial roles as multifunctional signaling molecules involved in cell adhesion, cell migration, neuronal pathfinding, fasciculation, and neurite outgrowth. Here, we provide an overview of the evidence implicating the β subunits in their conducting and non-conducting roles. Mutations in the β subunit genes (SCN1B–SCN4B) have been linked to a variety of diseases. These include cancer, epilepsy, cardiac arrhythmias, sudden infant death syndrome/sudden unexpected death in epilepsy, neuropathic pain, and multiple neurodegenerative disorders. β subunits thus provide novel therapeutic targets for future drug discovery.
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References
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Bouza, A.A., Isom, L.L. (2017). Voltage-Gated Sodium Channel β Subunits and Their Related Diseases. In: Chahine, M. (eds) Voltage-gated Sodium Channels: Structure, Function and Channelopathies. Handbook of Experimental Pharmacology, vol 246. Springer, Cham. https://doi.org/10.1007/164_2017_48
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