A mouse model of episodic ataxia type-1 Academic Article uri icon

Overview

MeSH Major

  • Cell Membrane
  • Cerebellum
  • Mutation
  • Neurons
  • Potassium Channels
  • Potassium Channels, Voltage-Gated
  • Spinocerebellar Degenerations

abstract

  • Episodic ataxia type-1 (EA1) is a dominant human neurological disorder characterized by stress-induced attacks of ataxia. EA1 is caused by mutations in the voltage-gated potassium channel Kv1.1, and affected individuals are heterozygous. Here we introduced the V408A EA1 mutation into mice using homologous recombination. In contrast to Kv1.1 null mice, homozygous V408A/V408A mice died after embryonic day 3 (E3). V408A/+ mice showed stress-induced loss of motor coordination that was ameliorated by acetazolamide, a carbonic anhydrase inhibitor that minimizes EA1 symptoms in human patients. We made electrophysiological recordings from cerebellar Purkinje cells in both V408A/+ mice and their wild-type littermates. V408A/+ mice showed a greater frequency and amplitude of spontaneous GABAergic inhibitory postsynaptic currents (IPSCs) than did wild type; however, the amplitude or frequency of miniature IPSCs and the basket cell firing frequency did not differ between groups. The stress-induced motor dysfunction in V408A mice is similar to that of family members harboring the EA1 allele, and our findings suggest that these behavioral changes are linked to changes in GABA release.

publication date

  • April 2003

Research

keywords

  • Academic Article

Identity

Language

  • eng

Digital Object Identifier (DOI)

  • 10.1038/nn1025

PubMed ID

  • 12612586

Additional Document Info

start page

  • 378

end page

  • 83

volume

  • 6

number

  • 4