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J Neurol Neurosurg Psychiatry 1998;65:565-568 ( October )

Short report

Spinocerebellar ataxia type 6 with positional vertigo and acetazolamide responsive episodic ataxia Joanna C Jen,a Qing Yue,a Juliana Karrim,a Stanley F Nelson,b Robert W Baloha c

a Department of Neurology, b Department of Pediatrics/Hematology and Oncology, c Department of Surgery (Head and Neck), UCLA School of Medicine, Los Angeles, California, USA

Correspondence to: Dr Robert W Baloh, UCLA Department of Neurology, Box 951769, Los Angeles, CA 90095-1769, USA. Telephone 001 310 825 5910; fax 001 310 206 1513; email:rwbaloh{at}ucla.edu

Received 18 December 1997 and in revised form 9 March 1998; Accepted 19 March 1998

The SCA6 mutation, a small expansion of a CAG repeat in a calcium channel gene CACNA1A, was identified in three pedigrees. Point mutations in other parts of the gene CACNA1A were excluded and new clinical features of SCA6 reported---namely, central positional nystagmus and episodic ataxia responsive to acetazolamide. The three allelic disorders, episodic ataxia type 2, familial hemiplegic migraine, and SCA6, have overlapping clinical features.

Keywords: SCA6; spinocerebellar ataxia; hereditary ataxia; calcium channel


© 1998 by Journal of Neurology, Neurosurgery, and Psychiatry



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