Abstract Motivation Genome-wide CRISPR-Cas9 screen has been widely used to interrogate gene functions. However, the rules to design better libraries beg further refinement. Results We found sgRNA outliers are characterized by higher G-nucleotide counts, especially in regions distal from the PAM motif, and are associated with stronger off-target activities. Furthermore, using non-targeting sgRNAs as negative controls lead to strong bias, which can be mitigated by using sgRNAs targeting multiple "safe harbor" regions. Custom-designed screens confirmed our findings and further revealed that 19nt sgRNAs consistently gave the best signal-to-noise ratio. Collectively, our analysis motivated the design of a new genome-wide CRISPR/Cas9 screen library and uncovered some intriguing properties of the CRISPR-Cas9 system. Availability The MAGeCK workflow is available open source at https://bitbucket.org/liulab/mageck_nest under the MIT license. Contact firstname.lastname@example.org Supplementary Information Supplementary data are available at Bioinformatics online. © The Author(s) (2018). Published by Oxford University Press. All rights reserved. For Permissions, please email: email@example.com This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/about_us/legal/notices)
Bioinformatics – Oxford University Press
Published: Jun 1, 2018
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