Abstract
Isolation of genetically modified cells generated by designed nucleases are challenging, since they are often phenotypically indistinguishable from their parental cells. To efficiently enrich genetically modified cells, we developed two dual-reporter surrogate systems, namely NHEJ-RPG and SSA-RPG based on NHEJ and SSA repair mechanisms, respectively. Repair and enrichment efficiencies of these two systems were compared using different nucleases. In both CRISPR-Cas9- and ZFNs-induced DSB repair studies, we found that the efficiency and sensitivity of the SSA-RPG reporter with direct repeat length more than 200 bp were much higher than the NHEJ-RPG reporter. By utilizing the SSA-RPG reporter, we achieved the enrichment for indels in several endogenous loci with 6.3- to 34.8-fold of non-selected cells. Thus, the highly sensitive SSA-RPG reporter can be used for activity validation of designed nucleases and efficient enrichment of genetically modified cells. Besides, our systems offer alternative enrichment choices either by puromycin selection or FACS.
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Acknowledgments
The authors would like to thank all the colleagues in Professor Zhang’s lab for their excellent technical assistance and helpful discussions. This work was supported by grants from National Natural Science Foundation of China (NSFC) [31171186], National Science and Technology Major Project of China [2014ZX0801009B] and Natural Science Basic Research Plan in Shaanxi Province of China [2013JQ3009].
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The authors declare that no competing interests exist.
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C. Ren and K. Xu contributed equally to this work and should be regarded as joint First Authors.
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Ren, C., Xu, K., Liu, Z. et al. Dual-reporter surrogate systems for efficient enrichment of genetically modified cells. Cell. Mol. Life Sci. 72, 2763–2772 (2015). https://doi.org/10.1007/s00018-015-1874-6
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DOI: https://doi.org/10.1007/s00018-015-1874-6