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Cerebellar Regional Dissection for Molecular Analysis
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Published on: December 5, 2020

Hereditary ataxias: overview.

Suman Jayadev1, Thomas D Bird

  • 1Department of Neurology, University of Washington, Seattle, Washington, USA.

Genetics in Medicine : Official Journal of the American College of Medical Genetics
|March 30, 2013
PubMed
Summary
This summary is machine-generated.

Hereditary ataxias are diverse neurological disorders affecting coordination. Genetic testing strategies for these conditions must consider subtype frequencies and clinical features due to extensive overlap.

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Area of Science:

  • Neurology
  • Genetics
  • Neuroscience

Background:

  • Hereditary ataxias are a heterogeneous group of neurological disorders.
  • Characterized by gait ataxia, incoordination, and cerebellar atrophy.
  • Includes over 35 autosomal dominant (spinocerebellar ataxias) and several autosomal recessive subtypes.

Purpose of the Study:

  • To review the heterogeneity of hereditary ataxias.
  • To discuss diagnostic genetic testing strategies.
  • To highlight treatment modalities for specific subtypes.

Main Methods:

  • Review of existing literature on hereditary ataxias.
  • Classification of ataxia subtypes based on inheritance patterns (autosomal dominant/recessive).
  • Analysis of common subtypes, genetic mechanisms, and phenotypic features.

Main Results:

  • Common spinocerebellar ataxias (1, 2, 3, 6, 7) are nucleotide repeat expansion disorders.
  • Common recessive ataxias include Friedreich ataxia and ataxia-telangiectasia.
  • Four recessive types have specific treatments (vitamin E, cerebrotendinous xanthomatosis, Refsum, CoQ10 deficiency).

Conclusions:

  • Diagnostic genetic testing is complex due to numerous subtypes with overlapping phenotypes.
  • Optimal testing requires considering subtype frequencies, ethnic factors, and associated clinical signs.
  • While some ataxias have treatments, many lack specific therapeutic options.