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Multiple pathways contribute to the pathogenesis of Huntington disease

Shihua Li1, Xiao-Jiang Li

  • 1Department of Human Genetics, Emory University School of Medicine, 615 Michael Street, Atlanta, GA 30322, USA. shihual@genetics.emory.edu

Molecular Neurodegeneration
|December 19, 2006
PubMed

Insights

Huntington disease (HD) involves a polyglutamine (polyQ) expansion in huntingtin (htt) protein, leading to neurodegeneration. Mutant htt affects multiple cellular pathways, and understanding these is key for effective HD therapies.

Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Huntington disease (HD) is a neurodegenerative disorder caused by polyglutamine (polyQ) expansion in the huntingtin (htt) protein.
  • PolyQ expansions are implicated in eight other inherited neurodegenerative disorders, each with distinct neuropathology.
  • Despite identified genetic defects, the precise pathogenesis of polyQ diseases remains unclear.

Purpose of the Study:

  • This review focuses on Huntington disease pathogenesis.
  • It outlines the effects of mutant huntingtin (htt) within the cell nucleus and neuronal processes.
  • It explores the role of cell-cell interactions in HD pathology.

Main Methods:

  • Review of existing literature on Huntington disease.
  • Analysis of mutant huntingtin (htt) expression, localization, and protein interactions.
  • Examination of cellular and molecular mechanisms underlying HD pathology.

Main Results:

  • Mutant huntingtin (htt) is widely expressed and localized in various cellular compartments.
  • Mutant htt interacts with numerous proteins, suggesting engagement of multiple pathogenic pathways.
  • Cell-cell interactions play a role in the progression of HD pathology.

Conclusions:

  • The pathogenesis of Huntington disease (HD) is complex, involving multiple pathways affected by mutant huntingtin (htt).
  • Understanding the diverse effects of mutant htt, including its nuclear and extranuclear actions and role in cell interactions, is crucial.
  • Elucidating these pathways is essential for developing targeted and effective therapies for HD.

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