Abstract
High-throughput CRISPR guide RNA (gRNA) library screen, that is, CRISPR/Cas9 screen, enables the unbiased identification of gene functions in a variety of biological processes. Typical pooled CRISPR/Cas9 screen couples a gRNA library and a guided Cas9 or dCas9 endonuclease to target specific gene loci, and then systematically uncover the causal link between candidate genes and observed cellular phenotypes via gRNA depletion or enrichment in screens. Here, we describe a detailed method of puromycin (PURO) concentration titration and lentiviral CRISPR gRNA library titration in Cas9 expressing monoclonal human iPSC line (Cas9+MNhiPSC) prior to performing the screens, conducting pooled CRISPR gRNA library screens in Cas9+MNhiPSC, genomic DNA extraction from the selected cell subpopulation and sequencing library preparation as well as next generation sequencing (NGS) to generate gRNA read counts. In CRISPR/Cas9 screen, we aim for 30% transduction efficiency (i.e., multiplicity of infection = 0.3) to ensure most of infected cells receive only one gRNA. The principles in this method can be applied to CRISPR perturbation (knockout, activation, repression or base editing) screens with other CRISPR gRNA libraries across many other cell models and other species.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (32100603, 31760742, 32060042, 81701195 and 81472126) and International Science and Technology Cooperation Program of Xinjiang Uygur Autonomous Region (2020E01006). We also acknowledged FACS core facility in Shenzhen University.
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Zhou, Y., Fu, Q., Shi, H., Zhou, G. (2022). CRISPR Guide RNA Library Screens in Human Induced Pluripotent Stem Cells. In: Turksen, K. (eds) Induced Pluripotent Stem Cells and Human Disease. Methods in Molecular Biology, vol 2549. Humana, New York, NY. https://doi.org/10.1007/7651_2021_455
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DOI: https://doi.org/10.1007/7651_2021_455
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