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Huntington disease: new insights into the relationship between CAG expansion and disease

J Nasir1, Y P Goldberg, M R Hayden

  • 1Department of Medical Genetics, University of British Columbia, Vancouver, Canada.

Human Molecular Genetics
|January 1, 1996
PubMed

Insights

Huntington disease (HD) involves a CAG expansion mutation. Mutant huntingtin protein is cleaved during apoptosis, suggesting inappropriate cell death contributes to HD pathogenesis.

Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Huntington disease (HD) is caused by a CAG repeat expansion in a novel gene.
  • Mutant huntingtin protein expression is critical for neuronal death in HD.
  • Huntingtin is essential for normal development and cell survival.

Purpose of the Study:

  • To explore the role of huntingtin protein cleavage in Huntington disease pathogenesis.
  • To investigate interactions between huntingtin and other proteins.
  • To discuss the development of animal models for HD research.

Main Methods:

  • Analysis of CAG repeat expansion and its effect on huntingtin protein.
  • Investigation of huntingtin cleavage by apopain during apoptosis.
  • Identification of proteins interacting with huntingtin.
  • Review of animal model development strategies (cDNA, YAC transgenics, knock-in).

Main Results:

  • Mutant huntingtin expression is essential for neuronal death.
  • Huntingtin is cleaved by apopain during apoptosis, with cleavage rate influenced by polyglutamine tract length.
  • Three proteins identified that interact with huntingtin, with two interactions affected by CAG length.
  • Animal models are crucial for understanding HD and testing therapies.

Conclusions:

  • Inappropriate apoptosis, driven by enhanced huntingtin cleavage, likely underlies Huntington disease.
  • Protein interactions with huntingtin are influenced by CAG repeat length.
  • Animal models are vital for advancing HD research and therapeutic development.

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