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PRKCG mutation (SCA-14) causing a Ramsay Hunt phenotype

✍ Scribed by Jasper E. Visser; Bastiaan R. Bloem; Bart P. C. van de Warrenburg

Book ID: 102506726
Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 75 KB
Volume: 22
Category: Article
ISSN: 0885-3185
DOI: 10.1002/mds.21414

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✦ Synopsis

Abstract

Progressive myoclonic ataxia, also referred to as Ramsay Hunt syndrome, is characterized by a combination of myoclonus and cerebellar ataxia, infrequently accompanied by tonic–clonic seizures. Its differential diagnosis overlaps with progressive myoclonic epilepsy, a syndrome with myoclonus, tonic–clonic seizures, progressive ataxia and dementia. In patients with progressive myoclonic epilepsy, specific diseases can frequently be recognized, but the diagnostic yield in progressive myoclonic ataxia is much lower. We describe a patient who presented with multifocal myoclonus in his thirties and who later developed cerebellar ataxia and focal dystonia. His father was similarly affected. Genetic studies revealed a mutation in the protein kinase C gamma (PRKCG) gene, known to cause spinocerebellar ataxia type 14 (SCA‐14). This case illustrates that both myoclonus and dystonia are part of the clinical spectrum in SCA‐14 and that myoclonus can even be the presenting symptom. We suggest that SCA‐14 should be considered in the differential diagnosis of progressive myoclonic ataxia. © 2007 Movement Disorder Society

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