Abstract
The Clustered Regularly Interspaced Short Palindromic Repeats/CRISPR-associated protein system (CRISPR/Cas) has recently become the most powerful tool available for genome engineering in various organisms. With efficient and proper expression of multiple guide RNAs (gRNAs), the CRISPR/Cas system is particularly suitable for multiplex genome editing. During the past several years, different CRISPR/Cas expression strategies, such as two-component transcriptional unit, single transcriptional unit, and bidirectional promoter systems, have been developed to efficiently express gRNAs as well as Cas nucleases. Significant progress has been made to optimize gRNA production using different types of promoters and RNA processing strategies such as ribozymes, endogenous RNases, and exogenous endoribonuclease (Csy4). Besides being constitutively and ubiquitously expressed, inducible and spatiotemporal regulations of gRNA expression have been demonstrated using inducible, tissue-specific, and/or synthetic promoters for specific research purposes. Most recently, the emergence of CRISPR/Cas ribonucleoprotein delivery methods, such as engineered nanoparticles, further revolutionized transgene-free and multiplex genome editing. In this review, we discuss current strategies and future perspectives for efficient expression and engineering of gRNAs with a goal to facilitate CRISPR/Cas-based multiplex genome editing.
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Acknowledgements
This work was supported by NSF Plant Genome Research Project Grant (1740874) and the USDA National Institute of Food and Agriculture and Hatch Appropriations under Project PEN04659 and Accession #1016432.
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Hsieh-Feng, V., Yang, Y. Efficient expression of multiple guide RNAs for CRISPR/Cas genome editing. aBIOTECH 1, 123–134 (2020). https://doi.org/10.1007/s42994-019-00014-w
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DOI: https://doi.org/10.1007/s42994-019-00014-w