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16q-ADCA (OMIM no. 117210) is an autosomal dominant spinocerebellar ataxia (AD-SCA) characterized by late-onset pure cerebellar ataxia and -16C&gt;T substitution of the puratrophin-1 gene. Recently, a series of single-nucleotide polymorphisms (haplotype block) were found to be specific to 16q-ADCA. We screened patients with ataxia and found 62 patients, including four homozygotes who carry the C-T substitution of the puratrophin-1 gene. By further analysis of the patients with the haplotype block, we observed a single-founder effect for 16q-ADCA, even in patients who are supposed to be sporadic late cortical cerebellar atrophy (LCCA). We also observed slippage mutations of microsatellite markers, GATA01 and 17 msm, in the pedigrees. We compared the clinical course of 16q-ADCA in heterozygotes and homozygotes with the haplotype block and observed no apparent gene dosage effect. 16q-ADCA accounts for 27% of AD-SCAs and is the most frequent AD-SCA in South Kyushu, Japan.

Clinical and genetic characterization of 16q-linked autosomal dominant spinocerebellar ataxia in South Kyushu, Japan