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Article

Validation Study to Determine the Accuracy of Widespread Promoterless EGFP Reporter at Assessing CRISPR/Cas9-Mediated Homology Directed Repair

by
Wanqing Xu
†,
Qingxia Zuo
†,
Dongyan Feng
,
Changsheng He
,
Cailing Lin
,
Dongchao Huang
,
Yanbin Wan
,
Feng Chen
,
Guosheng Mo
,
Qi Sun
,
Hongli Du
and
Lizhen Huang
*
School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Curr. Issues Mol. Biol. 2022, 44(4), 1688-1700; https://doi.org/10.3390/cimb44040116
Submission received: 4 February 2022 / Revised: 3 March 2022 / Accepted: 6 April 2022 / Published: 12 April 2022
(This article belongs to the Section Biochemistry, Molecular and Cellular Biology)
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Abstract

An accurate visual reporter system to assess homology-directed repair (HDR) is a key prerequisite for evaluating the efficiency of Cas9-mediated precise gene editing. Herein, we tested the utility of the widespread promoterless EGFP reporter to assess the efficiency of CRISPR/Cas9-mediated homologous recombination by fluorescence expression. We firstly established a promoterless EGFP reporter donor targeting the porcine GAPDH locus to study CRISPR/Cas9-mediated homologous recombination in porcine cells. Curiously, EGFP was expressed at unexpectedly high levels from the promoterless donor in porcine cells, with or without Cas9/sgRNA. Even higher EGFP expression was detected in human cells and those of other species when the porcine donor was transfected alone. Therefore, EGFP could be expressed at certain level in various cells transfected with the promoterless EGFP reporter alone, making it a low-resolution reporter for measuring Cas9-mediated HDR events. In summary, the widespread promoterless EGFP reporter could not be an ideal measurement for HDR screening and there is an urgent need to develop a more reliable, high-resolution HDR screening system to better explore strategies of increasing the efficiency of Cas9-mediated HDR in mammalian cells.
Keywords: CRISPR/Cas9; homology-directed repair; precise gene editing; random integration; promoterless EGFP reporter CRISPR/Cas9; homology-directed repair; precise gene editing; random integration; promoterless EGFP reporter

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MDPI and ACS Style

Xu, W.; Zuo, Q.; Feng, D.; He, C.; Lin, C.; Huang, D.; Wan, Y.; Chen, F.; Mo, G.; Sun, Q.; et al. Validation Study to Determine the Accuracy of Widespread Promoterless EGFP Reporter at Assessing CRISPR/Cas9-Mediated Homology Directed Repair. Curr. Issues Mol. Biol. 2022, 44, 1688-1700. https://doi.org/10.3390/cimb44040116

AMA Style

Xu W, Zuo Q, Feng D, He C, Lin C, Huang D, Wan Y, Chen F, Mo G, Sun Q, et al. Validation Study to Determine the Accuracy of Widespread Promoterless EGFP Reporter at Assessing CRISPR/Cas9-Mediated Homology Directed Repair. Current Issues in Molecular Biology. 2022; 44(4):1688-1700. https://doi.org/10.3390/cimb44040116

Chicago/Turabian Style

Xu, Wanqing, Qingxia Zuo, Dongyan Feng, Changsheng He, Cailing Lin, Dongchao Huang, Yanbin Wan, Feng Chen, Guosheng Mo, Qi Sun, and et al. 2022. "Validation Study to Determine the Accuracy of Widespread Promoterless EGFP Reporter at Assessing CRISPR/Cas9-Mediated Homology Directed Repair" Current Issues in Molecular Biology 44, no. 4: 1688-1700. https://doi.org/10.3390/cimb44040116

APA Style

Xu, W., Zuo, Q., Feng, D., He, C., Lin, C., Huang, D., Wan, Y., Chen, F., Mo, G., Sun, Q., Du, H., & Huang, L. (2022). Validation Study to Determine the Accuracy of Widespread Promoterless EGFP Reporter at Assessing CRISPR/Cas9-Mediated Homology Directed Repair. Current Issues in Molecular Biology, 44(4), 1688-1700. https://doi.org/10.3390/cimb44040116

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