Rheostatic Control of Cas9-Mediated DNA Double Strand Break (DSB) Generation and Genome Editing.

Rheostatic Control of Cas9-Mediated DNA Double Strand Break (DSB) Generation and Genome Editing.
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DOI:
10.1021/acschembio.7b00652
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发表时间:
2018-02-16
影响因子:
4
通讯作者:
Maly DJ
Maly DJ
中科院分区:
生物学2区
文献类型:
--
作者:
Rose JC;Stephany JJ;Wei CT;Fowler DM;Maly DJ

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我们最近报道了两种用于精确控制和定量Cas9活性的新工具:可以被小分子快速激活的化学诱导型Cas9变体(ciCas 9)和用于时间分辨测量DNA双链断裂的ddPCR测定(DSB-ddPCR)。在这里,我们进一步证明了ciCas 9作为Cas9功能的可调变阻器的潜力。我们发现,一种新的高效和选择性的小分子激活剂与更严格调控的ciCas 9变体配对,扩大了可获得的Cas9活性水平的范围。我们随后证明,ciCas 9活性水平可以用小分子激活剂进行剂量依赖性调节,从而促进变阻时程实验。这些研究首次深入了解了Cas9介导的DSB水平如何与整体编辑效率相关。因此,我们证明了ciCas 9和我们的DSB-ddPCR测定允许在宽范围的Cas9活性水平下对Cas9 DSB生成和基因组编辑动力学进行时间分辨研究。
We recently reported two novel tools for precisely controlling and quantifying Cas9 activity: a chemically inducible Cas9 variant (ciCas9) that can be rapidly activated by small molecules and a ddPCR assay for time-resolved measurement of DNA double strand breaks (DSB-ddPCR). Here, we further demonstrate the potential of ciCas9 to function as a tunable rheostat for Cas9 function. We show that a new highly potent and selective small molecule activator paired with a more tightly regulated ciCas9 variant expands the range of accessible Cas9 activity levels. We subsequently demonstrate that ciCas9 activity levels can be dose-dependently tuned with a small molecule activator, facilitating rheostatic time-course experiments. These studies provide the first insight into how Cas9-mediated DSB levels correlate with overall editing efficiency. Thus, we demonstrate that ciCas9 and our DSB-ddPCR assay permit the time-resolved study of Cas9 DSB generation and genome editing kinetics at a wide range of Cas9 activity levels.
CRIS/CAS9活性的生物物理模型,用于基因组编辑和基因调节的合理设计。
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