Enhanced proofreading governs CRISPR-Cas9 targeting accuracy.
Enhanced proofreading governs CRISPR-Cas9 targeting accuracy.
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DOI:
10.1038/nature24268
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发表时间:
2017-10-19
期刊:
影响因子:
64.8
通讯作者:
Doudna JA
中科院分区:
文献类型:
--
作者:
Chen JS;Dagdas YS;Kleinstiver BP;Welch MM;Sousa AA;Harrington LB;Sternberg SH;Joung JK;Yildiz A;Doudna JA
The RNA-guided CRISPR-Cas9 nuclease from Streptococcus pyogenes (SpCas9) has been widely repurposed for genome editing. High-fidelity (SpCas9-HF1) and enhanced specificity (eSpCas9(1.1)) variants exhibit substantially reduced off-target cleavage in human cells, but the mechanism of target discrimination and the potential to further improve fidelity were unknown. Using single-molecule Förster resonance energy transfer (smFRET) experiments, we show that both SpCas9-HF1 and eSpCas9(1.1) are trapped in an inactive state when bound to mismatched targets. We find that a non-catalytic domain within Cas9, REC3, recognizes target complementarity and governs the HNH nuclease to regulate overall catalytic competence. Exploiting this observation, we designed a new hyper-accurate Cas9 variant (HypaCas9) that demonstrates high genome-wide specificity without compromising on-target activity in human cells. These results offer a more comprehensive model to rationalize and modify the balance between target recognition and nuclease activation for precision genome editing.
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