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Kcnc2  -  potassium channel, voltage gated Shaw...

Rattus norvegicus

Synonyms: KSHIIIA, KShIIIA, Kv3.2, Potassium voltage-gated channel subfamily C member 2, Voltage-gated potassium channel subunit Kv3.2
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High impact information on Kcnc2

  • It is widely accepted that K+ channels with Kv3.1 or Kv3.2 subunits underlie fast, delayed-rectifier (DR) currents that endow neurons with this FS ability [1].
  • KShIIIA expression is particularly prominent throughout the dorsal thalamus [2].
  • NGK2-KV4 transcripts are particularly abundant in the cerebellar cortex, where KShIIIA expression is very weak [2].
  • 4. The genes encoding the alpha-subunits of slow-inactivating K+ channels for two members of the Shaker subfamily of K+ channels (Kv1.2 and Kv1.3) together with the Kv2.1, Kv3.1 and Kv3.2 channel genes were identified in PC12 cells [3].
  • Potassium channel subunit Kv3.2 and the water channel aquaporin-4 are selectively localized to cerebellar pinceau [4].

Biological context of Kcnc2

  • Alanine substitution mutagenesis around the S3b and S4 segments of Kv3.2 reveals that BDS acts via voltage-sensing domains, and, consistent with this, ON gating currents from nonconducting Kv3.2 are markedly inhibited [5].
  • We have investigated the possibility that the alternative splicing serves to generate channel subunits with different membrane targeting signals by examining the sorting behavior of three alternatively-spliced Kv3.2 isoforms when expressed in polarized MDCK cells [6].

Anatomical context of Kcnc2

  • Single-cell RT-PCR analysis of mRNA revealed that Kv3 (Kv3.1, Kv3.2) subunit transcripts were expressed in almost all (89%) of the interneurons but only in 17% of the pyramidal neurons [7].
  • Kv3.1-Kv3.2 channels underlie a high-voltage-activating component of the delayed rectifier K+ current in projecting neurons from the globus pallidus [8].
  • Kv3.1 and Kv3.2 channels have several unusual electrophysiological properties when expressed in heterologous expression systems and are thought to play special roles in neuronal excitability including facilitating sustained high-frequency firing in fast-spiking neurons such as interneurons in the cortex and the hippocampus [8].
  • Since Kv3.2 plays a similar role to Kv3.1 we also tested for the presence of Kv3.2 using immunohistochemistry, but failed to detect it in neuronal somata in the spinal cord [9].
  • Kv3.2 proteins are prominently expressed in patches in somatic and proximal dendritic membrane as well as in axons and presynaptic terminals of GABAergic interneurons [10].

Analytical, diagnostic and therapeutic context of Kcnc2


  1. Kv3.4 subunits enhance the repolarizing efficiency of Kv3.1 channels in fast-spiking neurons. Baranauskas, G., Tkatch, T., Nagata, K., Yeh, J.Z., Surmeier, D.J. Nat. Neurosci. (2003) [Pubmed]
  2. Region-specific expression of a K+ channel gene in brain. Rudy, B., Kentros, C., Weiser, M., Fruhling, D., Serodio, P., Vega-Saenz de Miera, E., Ellisman, M.H., Pollock, J.A., Baker, H. Proc. Natl. Acad. Sci. U.S.A. (1992) [Pubmed]
  3. Selective inhibition of a slow-inactivating voltage-dependent K+ channel in rat PC12 cells by hypoxia. Conforti, L., Millhorn, D.E. J. Physiol. (Lond.) (1997) [Pubmed]
  4. Potassium channel subunit Kv3.2 and the water channel aquaporin-4 are selectively localized to cerebellar pinceau. Bobik, M., Ellisman, M.H., Rudy, B., Martone, M.E. Brain Res. (2004) [Pubmed]
  5. Modulation of Kv3 subfamily potassium currents by the sea anemone toxin BDS: significance for CNS and biophysical studies. Yeung, S.Y., Thompson, D., Wang, Z., Fedida, D., Robertson, B. J. Neurosci. (2005) [Pubmed]
  6. K+ channel subunit isoforms with divergent carboxy-terminal sequences carry distinct membrane targeting signals. Ponce, A., Vega-Saenz de Miera, E., Kentros, C., Moreno, H., Thornhill, B., Rudy, B. J. Membr. Biol. (1997) [Pubmed]
  7. Functional and molecular differences between voltage-gated K+ channels of fast-spiking interneurons and pyramidal neurons of rat hippocampus. Martina, M., Schultz, J.H., Ehmke, H., Monyer, H., Jonas, P. J. Neurosci. (1998) [Pubmed]
  8. Kv3.1-Kv3.2 channels underlie a high-voltage-activating component of the delayed rectifier K+ current in projecting neurons from the globus pallidus. Hernández-Pineda, R., Chow, A., Amarillo, Y., Moreno, H., Saganich, M., Vega-Saenz de Miera, E.C., Hernández-Cruz, A., Rudy, B. J. Neurophysiol. (1999) [Pubmed]
  9. Properties of interneurones in the intermediolateral cell column of the rat spinal cord: role of the potassium channel subunit Kv3.1. Deuchars, S.A., Brooke, R.E., Frater, B., Deuchars, J. Neuroscience (2001) [Pubmed]
  10. K(+) channel expression distinguishes subpopulations of parvalbumin- and somatostatin-containing neocortical interneurons. Chow, A., Erisir, A., Farb, C., Nadal, M.S., Ozaita, A., Lau, D., Welker, E., Rudy, B. J. Neurosci. (1999) [Pubmed]
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