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A group of dominantly inherited, predominately late-onset, cerebellar ataxias which have been divided into multiple subtypes based on clinical features and genetic mapping. Progressive ataxia is a central feature of these conditions, and in certain subtypes POLYNEUROPATHY; DYSARTHRIA; visual loss; and other disorders may develop. (From Joynt, Clinical Neurology, 1997, Ch65, pp 12-17; J Neuropathol Exp Neurol 1998 Jun;57(6):531-43)
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Ataxin-3 Protein -- See Ataxin-3 A deubiquitinating enzyme of the ATAXINS family. It functions in protein homeostasis, GENETIC TRANSCRIPTION; CYTOSKELETON regulation, and MYOGENESIS. CAG TRINUCLEOTIDE REPEAT EXPANSION in the Ataxin-3 gene coding region is associated with spinocerebellar ataxia-3 (MACHADO-JOSEPH DISEASE)
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