CAG repeat length and disease duration in Machado-Joseph disease: A new clinical classification

H. Maruyama, H. Kawakami, T. Kohriyama, T. Sakai, M. Doyu, G. Sobue, M. Seto, M. Tsujihata, T. Oh-i, T. Nishio, N. Sunohara, R. Takahashi, T. Ohtake, M. Hayashi, M. Nishimura, T. Saida, K. Abe, Y. Itoyama, H. Matsumoto, S. Nakamura

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


To evaluate the clinical characteristics of Machado-Joseph disease (MJD) with reference to CAG repeat length and disease duration, we analyzed neurologic findings in 108 patients from 84 families. The majority of MJD patients presented with an ataxic gait as the initial symptom. Dysarthria and nystagmus were observed from an early stage. Bulging eyes, muscle atrophy and bradykinesia developed later. Patients with a shorter CAG repeat length or later onset had more frequent involvement of proprioceptive sensory deficit. Incidence of abnormal reflexes, tones, and proprioceptive sensation was not associated with disease duration, but with CAG repeat length. Based on these results, we propose a new clinical classification: type A (juvenile type), with hyperreflexia and dystonia, but without a proprioceptive sensory deficit; type C (adult type), with hyperreflexia and a proprioceptive sensory deficit, but without dystonia; and type B (intermediate type), the remaining patients with a mixed presentation.

Original languageEnglish
Pages (from-to)166-171
Number of pages6
JournalJournal of the neurological sciences
Issue number2
Publication statusPublished - Nov 25 1997
Externally publishedYes


  • CAG repeat length
  • Deep tendon reflexes
  • Disease duration
  • Machado-Joseph disease
  • Proprioceptive sensory deficit
  • Spinocerebellar ataxia type 1
  • Spinocerehellar ataxia type 2

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology


Dive into the research topics of 'CAG repeat length and disease duration in Machado-Joseph disease: A new clinical classification'. Together they form a unique fingerprint.

Cite this