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Updated: Jul 17, 2025

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Polyglutamine disease in peripheral tissues.

Taylor Barwell1, Laurent Seroude1

  • 1Department of Biology, Queen's University, 116 Barrie St, Kingston, ON K7L 3N6, Canada.

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|August 29, 2023
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Summary
This summary is machine-generated.

Huntington's disease (HD) is linked to the huntingtin gene. New research shows that mutant huntingtin in peripheral tissues, not just the brain, significantly worsens HD symptoms.

Keywords:
Huntington’s diseasehuntingtinmodel organismsprotein aggregates

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Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Huntington's disease (HD) is caused by expanded polyglutamine repeats in the huntingtin gene, leading to protein aggregation.
  • Despite 30 years since its discovery, a cure for HD remains elusive, and current treatments have adverse effects.
  • The huntingtin gene is expressed in many non-nervous system tissues, but their role in HD pathogenesis has been overlooked.

Approach:

  • This review examines the expression of the huntingtin gene in peripheral tissues.
  • It focuses on the nature and distribution of huntingtin aggregates in these tissues.
  • Recent findings in Drosophila models highlight the impact of mutant huntingtin in muscle and fat.

Key Points:

  • Selective expression of mutant huntingtin in Drosophila muscle or fat causes detrimental effects without neurodegeneration.
  • Distinct tissue distribution of huntingtin aggregates in Drosophila muscles exacerbates disease effects.
  • Peripheral tissues play a significant role in Huntington's disease pathology.

Conclusions:

  • Peripheral huntingtin gene expression and aggregate formation contribute to Huntington's disease.
  • Understanding these non-neuronal roles is crucial for developing new therapeutic strategies.
  • Targeting peripheral tissues may offer novel treatment avenues for Huntington's disease.