Unusual Familial Presentation of Epsilon-Sarcoglycan Gene Mutation with Falls and Writer's Cramp

Inherited myoclonus dystonia (M-D, DYTH) is an autosomal dominant dystonia-plus syndrome, which in many families is caused by mutations in the SGCE/tepsilon-sarcoglycan gene. We present a family with M-D, with an unusual presentaion characterized by infantile onset with falls in two sisters and adult-onset writer's cramp in their father. Myoclonus dystonia is typically characterized by a variable mixture of alcohol-sensitive myoclonie jerks and dystonia classically affecting mainly the proximal arms and neck. Leg involvement is less frequent, and to our knowledge, initial presentation with falls has not previously been described. The unusual phenotype of the family is discussed. (C) 2008 Movement Disorder Society