episodic ataxia

episodic ataxia
either of two autosomal dominant syndromes characterized by transient episodes of ataxia. Type 1 is caused by a mutation in the potassium channel gene on chromosome 12p13, and is characterized by tetanic contractions between the attacks of ataxia. Type 2 is caused by a mutation in the calcium channel gene on chromosome 19p and is characterized by cerebellar abnormalities.

Medical dictionary. 2011.

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