Frequency of spinocerebellar ataxia type 1, dentatorubropallidoluysian atrophy, and Machado-Joseph disease mutations in a large group of spinocerebellar ataxia patients

I. Silveira, Lopes-Cendes, S. Kish, P. Maciel, C. Gaspar, P. Coutinho, M. I. Botez, H. Teive, W. Arruda, C. E. Steiner, W. Pinto-Junior, J. A. Maciel, S. Jain, G. Sack, E. Andermann, L. Sudarsky, R. Rosenberg, P. MacLeod, D. Chitayat, R. BabulJ. Sequeiros, G. A. Rouleau

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Abstract

The spinocerebellar ataxias (SCAs) are a heterogeneous group of neurodegenerative disorders varying in both clinical manifestations and mode of inheritance. Six different genes causing autosomal dominant SCA are mapped: SCA1, SCA2, Machado-Joseph disease (MJD)/SCA3, SCA4, SCA5, and dentatorubropallidoluysian atrophy (DRPLA). Expansions of an unstable trinucleotide CAG repeat cause three of these disorders: SCA type 1 (SCA1), MJD, and DRPLA. We determined the frequency of the SCA1, DRPLA, and MJD mutations in a large group of unrelated SCA patients with various patterns of inheritance and different ethnic backgrounds. We studied 92 unrelated SCA patients. The frequency of the SCA1 mutation was 3% in the overall patient group and 10% in the non-Portuguese dominantly inherited SCA subgroup. We found the DRPLA mutation in only one Japanese patient, who was previously diagnosed with this disease. We identified the MJD mutation in 41% of the overall patient group, which included 38 autosomal dominant kindreds of Portuguese origin; the frequency of the MJD mutation among the non- Portuguese dominantly inherited cases was 17%. These results suggest that SCA may be occasionally caused by the SCA1 mutation and rarely caused by the DRPLA mutation and that, to date, the MJD mutation seems to be the most common cause of dominantly inherited SCA. Finally, our results suggest that recessively inherited cases of SCA are not caused by the known trinucleotide repeat expansions.

Original languageEnglish (US)
Pages (from-to)214-218
Number of pages5
JournalNeurology
Volume46
Issue number1
Publication statusPublished - Jan 1996

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ASJC Scopus subject areas

  • Neuroscience(all)

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Silveira, I., Lopes-Cendes, Kish, S., Maciel, P., Gaspar, C., Coutinho, P., ... Rouleau, G. A. (1996). Frequency of spinocerebellar ataxia type 1, dentatorubropallidoluysian atrophy, and Machado-Joseph disease mutations in a large group of spinocerebellar ataxia patients. Neurology, 46(1), 214-218.