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Hypothesis-based RNAi screening identifies neuroprotective genes in a Parkinson's disease model
Abstract
Genomic multiplication of the locus-encoding human α-synuclein (α-syn), a polypeptide with a propensity toward intracellular misfolding, results in Parkinson's disease (PD). Here we report the results from systematic screening of nearly 900 candidate genetic targets, prioritized by bioinformatic associations to existing PD genes and pathways, via RNAi knockdown. Depletion of 20 gene products reproducibly enhanced misfolding of α-syn over the course of aging in the nematode Caenorhabditis elegans . Subsequent functional analysis of seven positive targets revealed five previously unreported gene products that significantly protect against age- and dose-dependent α-syn-induced degeneration in the dopamine neurons of transgenic worms. These include two trafficking proteins, a conserved cellular scaffold-type protein that modulates G protein signaling, a protein of unknown function, and one gene reported to cause neurodegeneration in knockout mice. These data represent putative genetic susceptibility loci and potential therapeutic targets for PD, a movement disorder affecting ≈2% of the population over 65 years of age.
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Metadata
- Authors
- Hamamichi, S., Rivas, R. N., Knight, A. L., Cao, S., Caldwell, K. A., & Caldwell, G. A.
- Affiliations
- *Department of Biological Sciences, University of Alabama, Tuscaloosa, AL 35487; and
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2008-01-15
- Volume
- 105
- Issue
- 2
- Pages
- 728-733
- ISSN
- 0027-8424
- 1091-6490
- Cited by
- 268
- References
- 7
- Language
- en
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