High-throughput Yeast Plasmid Overexpression Screen
Summary
Here we describe a plasmid overexpression screen in Saccharomyces cerevisiae, using an arrayed plasmid library and a high-throughput yeast transformation protocol with a liquid handling robot.
Abstract
The budding yeast, Saccharomyces cerevisiae, is a powerful model system for defining fundamental mechanisms of many important cellular processes, including those with direct relevance to human disease. Because of its short generation time and well-characterized genome, a major experimental advantage of the yeast model system is the ability to perform genetic screens to identify genes and pathways that are involved in a given process. Over the last thirty years such genetic screens have been used to elucidate the cell cycle, secretory pathway, and many more highly conserved aspects of eukaryotic cell biology 1-5. In the last few years, several genomewide libraries of yeast strains and plasmids have been generated 6-10. These collections now allow for the systematic interrogation of gene function using gain- and loss-of-function approaches 11-16. Here we provide a detailed protocol for the use of a high-throughput yeast transformation protocol with a liquid handling robot to perform a plasmid overexpression screen, using an arrayed library of 5,500 yeast plasmids. We have been using these screens to identify genetic modifiers of toxicity associated with the accumulation of aggregation-prone human neurodegenerative disease proteins. The methods presented here are readily adaptable to the study of other cellular phenotypes of interest.
Protocol
Discussion
Here we present a protocol to perform a high-throughput plasmid overexpression screen in yeast. This approach allows for the rapid and unbiased screening for genetic modifiers of many different cellular phenotypes. Using this approach, a researcher can screen a significant portion of the yeast genome in a matter of weeks. This unbiased approach also allows for the identification of modifiers, which may not have been predicted based on previous findings. We have used this approach to identify modifiers of toxicity assoc…
Divulgazioni
The authors have nothing to disclose.
Acknowledgements
This work was supported by a grant from the Packard Center for ALS Research at Johns Hopkins (A.D.G.), an NIH Director’s New Innovator Award 1DP2OD004417-01 (A.D.G), NIH R01 NS065317 (A.D.G.), the Rita Allen Foundation Scholar Award. A.D.G. is a Pew Scholar in the Biomedical Sciences, supported by The Pew Charitable Trusts.
Materials
| Name of reagent | Company | Catalog number |
|---|---|---|
| BioRobot RapidPlate | Qiagen | 9000490 |
| 96 bolt replicator (frogger) | V&P Scientific | VP404 |
| FLEXGene ORF Library | Institute of Proteomics, Harvard Medical School | |
| Tabletop centrifuge | Eppendorf | 5810R |
| 500mL baffled flask | Bellco | 2543-00500 |
| 2.8L triple-baffled Fernbach flask | Bellco | 2551-02800 |
| 100μL Rapidplate pipette tips | Axygen | ZT-100-R-S |
| 200μL Rapidplate pipette tips | Axygen | ZT-200-R-S |
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