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Related Experiment Video

Updated: Jul 5, 2026

A Simple Composite Phenotype Scoring System for Evaluating Mouse Models of Cerebellar Ataxia
07:33

A Simple Composite Phenotype Scoring System for Evaluating Mouse Models of Cerebellar Ataxia

Published on: May 21, 2010

SCA3: neurological features, pathogenesis and animal models.

Olaf Riess1, Udo Rüb, Annalisa Pastore

  • 1Department of Medical Genetics, University of Tuebingen, Calwerstrasse 7, D-72076 Tuebingen, Germany. olaf.riess@med.uni-tuebingen.de

Cerebellum (London, England)
|April 18, 2008
PubMed
Summary

Spinocerebellar ataxia type 14 (SCA14) is linked to expanded CAG repeats in the ataxin-3 gene. This review details SCA14 subphenotypes, neuropathology, and the role of ataxin-3 protein dysfunction.

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Area of Science:

  • Genetics
  • Neuroscience
  • Molecular Biology

Background:

  • Autosomal dominant spinocerebellar ataxias (SCAs) are a group of inherited neurodegenerative disorders.
  • Spinocerebellar ataxia type 14 (SCA14) is the most common subtype, caused by CAG repeat expansions in the ataxin-3 gene, typically exceeding 55 repeats.
  • Phenotypic variability in SCA14 is influenced by expanded repeat length and age of onset, with paternal transmission often linked to anticipation.

Purpose of the Study:

  • To review the clinical subphenotypes of SCA14 and correlate them with specific CAG repeat expansions.
  • To provide a detailed description of the neuropathological features associated with SCA14.
  • To discuss the function of normal ataxin-3 protein and the consequences of its dysfunction in SCA14, including predicted protein structure.

Main Methods:

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Last Updated: Jul 5, 2026

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  • Literature review of studies on spinocerebellar ataxia type 14.
  • Correlation of clinical phenotypes with genetic repeat expansions.
  • Analysis of neuropathological findings.
  • Review of molecular mechanisms involving ataxin-3 protein.

Main Results:

  • Four distinct clinical subphenotypes of SCA14 have been identified and correlated with specific CAG repeat expansion sizes.
  • Neuropathological examination reveals characteristic changes in affected brain regions.
  • Understanding ataxin-3 protein function and dysfunction provides insights into disease pathogenesis.

Conclusions:

  • CAG repeat expansions in the ataxin-3 gene are the primary cause of SCA14, leading to diverse clinical presentations.
  • Neuropathological features are crucial for diagnosing and understanding the progression of SCA14.
  • Further research into ataxin-3 protein biology is essential for developing therapeutic strategies for SCA14.