Potassium voltage-gated channel subfamily C member 1 is a protein that in humans is encoded by the KCNC1gene.[5][6][7]
The Shaker gene family of Drosophila encodes components of voltage-gated potassium channels and comprises four subfamilies. Based on sequence similarity, this gene is similar to one of these subfamilies, namely the Shaw subfamily. The protein encoded by this gene belongs to the delayed rectifier class of channel proteins and is an integral membrane protein that mediates the voltage-dependent potassium ion permeability of excitable membranes.[7]
Kv3.1/Kv3.2 conductance is necessary and kinetically optimized for high-frequency action potential generation.[9][11] Kv3.1 channels are important for the high-firing frequency of auditory and fast-spiking GABAergic interneurons, retinal ganglion cells; regulation of action potential duration in presynaptic terminals.[8][10]
Pharmacological properties
Kv3.1 currents in heterologous systems are highly sensitive to external tetraethylammonium (TEA) or 4-aminopyridine (4-AP) (IC50 values are 0.2 mM and 29 μM respectively).[9][10] This can be useful in identifying native channels.[9] The overlapping sensitivity of potassium current to both 0.5 mM TEA and 30 μM 4-AP strongly suggest an action on Kv3.1 subunits.[12]
^Muona M, Berkovic SF, Dibbens LM, Oliver KL, Maljevic S, Bayly MA, Joensuu T, Canafoglia L, Franceschetti S, Michelucci R, Markkinen S, Heron SE, Hildebrand MS, Andermann E, Andermann F, Gambardella A, Tinuper P, Licchetta L, Scheffer IE, Criscuolo C, Filla A, Ferlazzo E, Ahmad J, Ahmad A, Baykan B, Said E, Topcu M, Riguzzi P, King MD, Ozkara C, Andrade DM, Engelsen BA, Crespel A, Lindenau M, Lohmann E, Saletti V, Massano J, Privitera M, Espay AJ, Kauffmann B, Duchowny M, Møller RS, Straussberg R, Afawi Z, Ben-Zeev B, Samocha KE, Daly MJ, Petrou S, Lerche H, Palotie A, Lehesjoki AE (2015). "A recurrent de novo mutation in KCNC1 causes progressive myoclonus epilepsy". Nature Genetics. 47 (1): 39–46. doi:10.1038/ng.3144. PMC4281260. PMID25401298.
