Abstract
Small hairpin RNA (shRNA) is a powerful tool for inhibiting gene expression. One limitation has been that this technique has been used primarily to target a single gene. This protocol expands upon previous methods by describing a knockdown vector that facilitates cloning of multiple shRNAs; this allows targeted knockdown of more than one gene or of a single gene that may otherwise be difficult to knockdown using a single shRNA. The targeted gene(s) can be readily re-expressed by transfecting knockdown cells with a knock-in vector, containing an shRNA-refractive cDNA that will express the protein-of-interest even in the presence of shRNAs. The constructed knockdown and knock-in vectors can be easily used concurrently to assess possible interrelationships between genes, the effects of gene loss on cell function and/or their restoration by replacing targeted genes one at a time. The entire knockdown or knock-in procedure can be completed in ∼3–4 months.
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Acknowledgements
This research was supported by the Intramural Research Program of the National Institutes of Health (NIH), NCI, Center for Cancer Research to D.L.H. and NIH grants to V.N.G.
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X.-M.X., designed and constructed the pU6-m4 vector; X.-M.X. and M.-H.Y. designed and constructed shRNA and knock-in constructs; X.-M.X., M.-H.Y. and B.A.C. designed and carried out the experiments with the advice of D.L.H. X.-M.X., M.-H.Y., B.A.C., V.N.G. and D.L.H. analyzed results, interpreted the data and wrote the manuscript.
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Xu, XM., Yoo, MH., Carlson, B. et al. Simultaneous knockdown of the expression of two genes using multiple shRNAs and subsequent knock-in of their expression. Nat Protoc 4, 1338–1348 (2009). https://doi.org/10.1038/nprot.2009.145
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DOI: https://doi.org/10.1038/nprot.2009.145
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