Spinocerebellar ataxia type 6 (SCA6) is the most common subtype of autosomal dominant cerebellar ataxia type III (ADCA type III) characterized by late-onset and slowly progressive gait ataxia and other cerebellar signs such as impaired muscle coordination and nystagmus. The disease is spinocerebellar ataxia type 6 (MONDO_0008457). Also known as: CACNA1A autosomal dominant cerebellar ataxia type III, SCA6, autosomal dominant cerebellar ataxia type III caused by mutation in CACNA1A.