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Huntington's disease: translating a CAG repeat into a pathogenic mechanism
1Molecular Neurogenetics Unit, Massachusetts General Hospital East, Charlestown 02129, USA.
Current Opinion in Neurobiology
|October 1, 1996
Summary
Huntington's disease (HD) involves neuronal cell death caused by an abnormal huntingtin protein. This protein arises from a gene defect, leading to an expanded CAG repeat and altered protein functions.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Huntington's disease (HD) is characterized by a specific pattern of neuronal cell death.
- This neurodegeneration is linked to an abnormal huntingtin protein.
Purpose of the Study:
- To investigate the role of the expanded CAG repeat in the huntingtin gene.
- To understand how the abnormal huntingtin protein contributes to neuronal cell death in HD.
Main Methods:
- Analysis of the HD gene defect, specifically the expanded CAG repeat.
- Examination of the huntingtin protein's structure and function.
Main Results:
- The abnormal huntingtin protein, produced from the HD gene defect (expanded CAG repeat), triggers specific neuronal cell death patterns.
- The extended polyglutamine segment of the huntingtin protein may alter its inherent activity or enable new cellular pathway interactions.
Conclusions:
- The study highlights the critical role of the huntingtin protein's polyglutamine tract in HD pathogenesis.
- Understanding the normal and abnormal physiological functions of the huntingtin protein is key to developing HD therapies.