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A rare disease with characteristics of slowly progressive and relatively pure ataxia described in 6 patients from one Australian family to date. The disease presents with oculomotor dysfunction, moderate dysarthria, and ataxia that progresses slowly and eventually leads to mobility impairment. Some patients have also reported mild hyperreflexia in the lower limbs. Rare manifestations include gaze-evoked nystagmus and dystonia. The causal gene has not yet been identified but it has been linked to chromosome 4q34.3-q35.1.
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