Abstract
The clustered, regularly interspaced, short palindromic repeat (CRISPR)-associated (Cas) system represents an efficient tool for genome editing. It consists of two components: the Cas9 protein and a guide RNA. To date, delivery of these two components has been achieved using either plasmid or viral vectors or direct delivery of protein and RNA. Plasmid- and virus-free direct delivery of Cas9 protein and guide RNA has several advantages over the conventional plasmid-mediated approach. Direct delivery results in shorter exposure time at the cellular level, which in turn leads to lower toxicity and fewer off-target mutations with reduced host immune responses, whereas plasmid- or viral vector-mediated delivery can result in uncontrolled integration of the vector sequence into the host genome and unwanted immune responses. Cell-penetrating peptide (CPP), a peptide that has an intrinsic ability to translocate across cell membranes, has been adopted as a means of achieving efficient Cas9 protein and guide RNA delivery. We developed a method for treating human cell lines with CPP-conjugated recombinant Cas9 protein and CPP-complexed guide RNAs that leads to endogenous gene disruption. Here we describe a protocol for preparing an efficient CPP-conjugated recombinant Cas9 protein and CPP-complexed guide RNAs, as well as treatment methods to achieve safe genome editing in human cell lines.
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Acknowledgments
This work was supported by the Korean Health Technology R&D Project, Ministry of Health and Welfare, Republic of Korea (HI14C2019 (Medistar program)).
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Suresh, B., Ramakrishna, S., Kim, H. (2017). Cell-Penetrating Peptide-Mediated Delivery of Cas9 Protein and Guide RNA for Genome Editing. In: Wajapeyee, N., Gupta, R. (eds) Eukaryotic Transcriptional and Post-Transcriptional Gene Expression Regulation. Methods in Molecular Biology, vol 1507. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-6518-2_7
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DOI: https://doi.org/10.1007/978-1-4939-6518-2_7
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