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Mass Histology to Quantify Neurodegeneration in Drosophila
Published on: December 15, 2016
Morphometric analysis of Huntington's disease neurodegeneration in Drosophila
Wan Song1, Marianne R Smith, Adeela Syed
1Department of Developmental and Cell Biology, University of California, Irvine, Irvine, CA, USA.
Insights
Huntington's disease (HD) research utilizes Drosophila models to study neurodegeneration. A novel optical pseudopupil assay offers a fast, sensitive method for quantifying HD progression in vivo.
Area of Science:
- Neuroscience
- Genetics
- Biomedical Research
Background:
- Huntington's disease (HD) is an autosomal dominant neurodegenerative disorder caused by expanded polyglutamine (polyQ) tracts in the huntingtin protein (HTT).
- Expanded polyQ diseases represent a class of inherited neurological disorders.
- Drosophila melanogaster serves as a valuable model organism for studying HD, recapitulating key disease features like late onset and protein aggregate formation.
Purpose of the Study:
- To develop a rapid and sensitive assay for quantifying neurodegeneration in vivo.
- To assess the utility of the optical pseudopupil method for studying Huntington's disease progression in a Drosophila model.
Main Methods:
- Development and application of an optical pseudopupil method for in vivo measurement.
- Utilizing Drosophila models engineered to express expanded polyglutamine tracts.
- Detailed analysis of experimental parameters influencing assay results, including genetic background and environmental factors.
Main Results:
- The optical pseudopupil method provides a quantifiable and sensitive measure of neurodegeneration.
- The assay is effective in assessing the degree of HD-related pathology in vivo.
- Factors such as genetic background, specific genetic constructs, and temperature significantly impact assay outcomes.
Conclusions:
- The optical pseudopupil assay is a powerful tool for studying neurodegenerative mechanisms in Huntington's disease.
- This method can accelerate the identification of therapeutic targets and agents for HD.
- Further optimization and understanding of influencing factors are crucial for robust application of the assay.
Abstract:
Huntington's disease (HD) is an autosomal dominant neurodegenerative disorder. The HD gene encodes the huntingtin protein (HTT) that contains polyglutamine tracts of variable length. Expansions of the CAG repeat near the amino terminus to encode 40 or more glutamines (polyQ) lead to disease. At least eight other expanded polyQ diseases have been described. HD can be faithfully modeled in Drosophila with the key features of the disease such as late onset, slowly progressing degeneration, formation of abnormal protein aggregates and the dependence on polyQ length being evident. Such invertebrate model organisms provide powerful platforms to explore neurodegenerative mechanisms and to productively speed the identification of targets and agents that are likely to be effective at treating diseases in humans. Here we describe an optical pseudopupil method that can be readily quantified to provide a fast and sensitive assay for assessing the degree of HD neurodegeneration in vivo. We discuss detailed crossing schemes as well as factors including different drivers, various constructs, the number of UAS sites, genetic background, and temperature that can influence the result of pseudopupil measurements.
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