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A very rare subtype of type I autosomal dominant cerebellar ataxia with cerebellar dysarthria as the initial typical manifestation. Prevalence is unknown. Fewer than 20 cases in a 4-generation Australian family of Anglo-Celtic descent have been reported to date. Age of symptomatic disease onset ranges from 19 to 64 years. Linked to chromosome 11q12.2-11q12.3.
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