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Recent advances in understanding the pathogenesis of Huntington's disease
P H Reddy1, M Williams, D A Tagle
1Genetics and Molecular Biology Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA.
Insights
Huntington's disease (HD) is a neurodegenerative disorder caused by a CAG repeat expansion in the HD gene. Mutant huntingtin protein in the nucleus is key to HD pathogenesis, with ongoing research using models to find therapies.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Huntington's disease (HD) is an inherited neurodegenerative disorder.
- Characterized by involuntary movements, cognitive decline, and neuronal loss.
- Caused by an expanded CAG trinucleotide repeat in the HD gene.
Purpose of the Study:
- To understand the role of mutant huntingtin protein translocation to the nucleus in HD pathogenesis.
- To explore in vitro identified huntingtin-interacting proteins and their significance in HD.
- To leverage cellular and animal models for studying HD mechanisms and therapeutic strategies.
Main Methods:
- Analysis of the HD gene and its encoded huntingtin protein.
- Investigating the subcellular localization of normal versus mutant huntingtin.
- Utilizing in vitro protein interaction studies.
- Developing and employing cellular and animal models for HD research.
Main Results:
- CAG repeat expansion in the HD gene correlates with HD onset and progression.
- Mutant huntingtin protein translocates to the nucleus, unlike normal huntingtin.
- In vitro studies have identified huntingtin-interacting proteins, though their in vivo significance is under investigation.
Conclusions:
- Nuclear translocation of mutant huntingtin is crucial for HD pathogenesis.
- Further research using advanced models is essential for elucidating HD mechanisms.
- These models offer promising avenues for evaluating potential therapeutic interventions for Huntington's disease.
Abstract:
Huntington's disease (HD) is an autosomal, dominantly inherited neurodegenerative disorder that is characterized by abnormal involuntary movements (chorea), intellectual impairment and selective neuronal loss. The expansion of a polymorphic trinucleotide repeat (the sequence CAG that codes for glutamine) to a length that exceeds 40 repeat units in exon 1 of the gene, HD, correlates with the onset and progression of the disease. The protein encoded by HD, huntingtin, is normally localized in the cytoplasm, whereas the mutant protein is also found in the nucleus, suggesting that its translocation to this site is important for the pathogenesis of HD. Although several proteins that interact with huntingtin have been identified in vitro, the significance of these interactions with the mutant protein in the pathogenesis of HD has yet to be determined. Recent progress in the development of cellular and animal models for the disease have provided invaluable insights and resources for studying the disease mechanisms underlying HD, and will be useful for screening and evaluating possible therapeutic strategies.