Incorporation of bridged nucleic acids into CRISPR RNAs improves Cas9 endonuclease specificity.
Incorporation of bridged nucleic acids into CRISPR RNAs improves Cas9 endonuclease specificity.
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DOI:
10.1038/s41467-018-03927-0
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发表时间:
2018-04-13
影响因子:
16.6
通讯作者:
Hubbard BP
中科院分区:
文献类型:
--
作者:
Cromwell CR;Sung K;Park J;Krysler AR;Jovel J;Kim SK;Hubbard BP
Off-target DNA cleavage is a paramount concern when applying CRISPR-Cas9 gene-editing technology to functional genetics and human therapeutic applications. Here, we show that incorporation of next-generation bridged nucleic acids (2′,4′-BNANC[N-Me]) as well as locked nucleic acids (LNA) at specific locations in CRISPR-RNAs (crRNAs) broadly reduces off-target DNA cleavage by Cas9 in vitro and in cells by several orders of magnitude. Using single-molecule FRET experiments we show that BNANC incorporation slows Cas9 kinetics and improves specificity by inducing a highly dynamic crRNA–DNA duplex for off-target sequences, which shortens dwell time in the cleavage-competent, “zipped” conformation. In addition to describing a robust technique for improving the precision of CRISPR/Cas9-based gene editing, this study illuminates an application of synthetic nucleic acids. Minimizing off-target effects is an important concern for therapeutic applications of CRISPR-Cas9. Here, the authors show that incorporating bridged or locked nucleic acids into crRNA improves editing kinetics and reduces off-target cleavage.
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作者:
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Porteus MH
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