DNA mismatch repair and oligonucleotide end-protection promote base-pair substitution distal from a CRISPR/Cas9-induced DNA break.

DNA mismatch repair and oligonucleotide end-protection promote base-pair substitution distal from a CRISPR/Cas9-induced DNA break.
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DOI:
10.1093/nar/gky076
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发表时间:
2018-04-06
影响因子:
14.9
通讯作者:
Te Riele H
Te Riele H
中科院分区:
生物学2区
文献类型:
--
作者:
Harmsen T;Klaasen S;van de Vrugt H;Te Riele H

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单链寡脱氧核糖核苷酸 (ssODN) 介导的 CRISPR/Cas9 诱导的 DNA 双链断裂 (DSB) 修复可以有效地用于在确定的基因座中引入小的基因组改变。在这里,我们揭示了当替换由 ssODN 的 3' 部分指示时,DNA 错配修复 (MMR) 活性对于远离 Cas9 诱导的 DNA 断裂的有效核苷酸替换至关重要。此外,用硫代磷酸酯键保护 ssODN 3' 末端可增强 MMR 依赖性基因编辑事件。我们的研究结果可用于优化远离 DSB 的核苷酸取代的效率,并意味着寡核苷酸介导的基因编辑是通过模板化断裂修复来实现的。
Single-stranded oligodeoxyribonucleotide (ssODN)-mediated repair of CRISPR/Cas9-induced DNA double-strand breaks (DSB) can effectively be used to introduce small genomic alterations in a defined locus. Here, we reveal DNA mismatch repair (MMR) activity is crucial for efficient nucleotide substitution distal from the Cas9-induced DNA break when the substitution is instructed by the 3′ half of the ssODN. Furthermore, protecting the ssODN 3′ end with phosphorothioate linkages enhances MMR-dependent gene editing events. Our findings can be exploited to optimize efficiencies of nucleotide substitutions distal from the DSB and imply that oligonucleotide-mediated gene editing is effectuated by templated break repair.
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