Abstract
We describe the clinical phenotype of a novel de novo KNCA1 mutation, and functional characterization of the effects of the mutation on Kv1.1 channel function. HEK293 cells were transfected transiently with either wild-type or mutant channels. Representative currents were evoked after application of a series of square voltage steps from -80 mV to +50 mV in 200-ms intervals from Vh = -80 mV. Extracellular K+ was added to evoke tail currents. Equal amounts of wild-type and Kv1.1I262M mutant DNA were transfected transiently in HEK293 cells to evaluate the influence of the mutation. We found that Kv1.1I262M leads to a defective voltage-gated potassium channel. Coexpression studies revealed a dominant-negative effect. We describe the phenotype of a novel KCNA1 mutation causing episodic ataxia. Patch-clamp studies confirm the pathogenicity of the mutation in vitro and suggest that it is dominant with respect to wild-type.
Original language | English |
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Pages (from-to) | 289-291 |
Number of pages | 3 |
Journal | Muscle and Nerve |
Volume | 50 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Aug 2014 |
Keywords
- Channelopathy
- Episodic ataxia type 1
- Ion channels
- KCNA1
- Potassium channel