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Machado-Joseph disease

L Sudarsky1, P Coutinho

  • 1Neurology Service (127), VA Medical Center, West Roxbury, MA 02132, USA.

Clinical Neuroscience (New York, N.Y.)
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

Machado-Joseph disease, a genetic ataxia, presents with progressive neurological symptoms. It is caused by an unstable CAG repeat expansion on chromosome 14.

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Area of Science:

  • Neuroscience
  • Genetics
  • Neurology

Background:

  • Machado-Joseph disease (MJD) is a dominantly inherited ataxia.
  • Originally identified in Portuguese and Azorean populations, it now has a global distribution.
  • Onset typically occurs between ages 35-40, with varied clinical presentations.

Purpose of the Study:

  • To describe the core features and neuropathology of Machado-Joseph disease.
  • To identify the genetic cause of MJD.
  • To discuss the relationship between MJD and other dominant ataxias like SCA-3.

Main Methods:

  • Clinical description of MJD phenotypes.
  • Neuropathological examination of affected cerebellar and brainstem systems.
  • Genetic analysis identifying a CAG repeat expansion on chromosome 14q32.1.

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Main Results:

  • MJD exhibits progressive ataxia, dysarthria, postural instability, and other neurological signs.
  • Neuropathology reveals involvement of cerebellar afferent/efferent pathways and substantia nigra.
  • The genetic basis is an unstable CAG repeat expansion on chromosome 14q32.1, consistent with SCA-3.

Conclusions:

  • MJD is a single genetic disorder caused by a CAG repeat expansion.
  • The clinical spectrum is wide, potentially reflecting varying repeat lengths or modifiers.
  • MJD is genetically linked to other dominant ataxias on chromosome 14.