Site-specific genome engineering technologies are increasingly important tools in the postgenomic era, where biotechnological objectives often require organisms with precisely modified genomes. Rare-cutting endonucleases, through their capacity to create a targeted DNA strand break, are one of the most promising of these technologies. However, realizing the full potential of nuclease-induced genome engineering requires a detailed understanding of the variables that influence resolution of nuclease-induced DNA breaks. Here we present a genome engineering reporter system, designated 'traffic light', that supports rapid flow-cytometric analysis of repair pathway choice at individual DNA breaks, quantitative tracking of nuclease expression and donor template delivery, and high-throughput screens for factors that bias the engineering outcome. We applied the traffic light system to evaluate the efficiency and outcome of nuclease-induced genome engineering in human cell lines and identified strategies to facilitate isolation of cells in which a desired engineering outcome has occurred.
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M.T.C. was supported in part by Public Health Service, National Research Service Award, T32 GM07270, from the US National Institute of General Medical Sciences. Additional funding was from US National Institutes of Health (RL1CA133832, UL1DE019582, R01-HL075453, PL1-HL092557 and RL1-HL092553) and Seattle Children's Center for Immunity and Immunotherapies. We thank C. Ramirez and K. Joung for zinc-finger nuclease constructs (Harvard University, Massachusetts General Hospital), and all members of the Northwest Genome Engineering Consortium for their many insightful discussions.
The authors declare no competing financial interests.
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Certo, M., Ryu, B., Annis, J. et al. Tracking genome engineering outcome at individual DNA breakpoints. Nat Methods 8, 671–676 (2011). https://doi.org/10.1038/nmeth.1648
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