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Spinocerebellar ataxia type 6 is a newly classified autosomal-dominant cerebellar ataxia(ADCA)associated with CAG repeat expansion.We screened 111 patients with cerebellar ataxia for the SCA6 mutation.Of these,35 patients were found to have expanded CAG repeats in the SCA6 gene, indicating that second to SCA3,SCA6 is the most common ADCA in Japan. Expanded alleles ranged from 21 to 29 repeats,whereas normal alleles had seven to 17 repeats.There was no change in the CAG repeat length during meiosis.The age at onset was inversely correlated with the repeat length. The main clinical feature of the 35 patients with SCA6 was slowly progressive cerebellar ataxia;multisystem involvement was not common.The 35 patients included nine cases without apparent family history of cerebellar ataxia.The sporadic cases had smaller CAG repeats(21 or 22 repeats)and a later age at onset(64.9+/-4.9 years)than the other cases with established family history.We also identified one patient who was homozygous for the SCA6 repeat expansion.The homo-zygote showed an earlier age of onset and more severe clinical manifestations than her sister,a heterozygote carrying an expanded allele with the same repeat length as the homozygote.This finding suggests that the dosage of the CAG repeat expansion plays an important role in the phenotypic expression in SCA6. |
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ataxia
ataxia,cerebellar
ataxia,hereditary
ataxia,truncal
CAG repeats
cerebellar ataxia,hereditary
cerebellar ataxia,primary
dysarthria
familial
gene
gene mutation
genetic neurologic disorders
molecular genetics
MRI
MRI,abnormal
nystagmus
ophthalmoplegia
sensory loss
spinocerebellar ataxia
spinocerebellar ataxia type 6
spinocerebellar degeneration
trinucleotide repeats
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