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Updated: Jun 24, 2025

Genome Editing in Mammalian Cell Lines using CRISPR-Cas

Genome Editing in Mammalian Cell Lines using CRISPR-Cas

Published on: April 11, 2019

通过SpCas9对PAM远端不匹配的耐受性进行了一项机制研究

Dhritiman Dey¹, Rudra Chakravarti¹, Oindrila Bhattacharjee²

¹Department of Natural Products, National Institute of Pharmaceutical Education and Research, Kolkata, West Bengal, India.

The Journal of biological chemistry

|June 5, 2024

概括

基因编辑CRISPR-Cas9基因编辑

科学领域:

分子生物学分子生物学
生物技术是生物技术.
生物信息学是一种生物信息学.

背景情况:

克里斯普尔-Cas9技术提供了革命性的基因编辑能力.
治疗应用受到意外的目标外突变的阻碍.
了解SpCas9的目标外活性对于安全的临床使用至关重要.

研究的目的:

调查PAM远端不匹配对SpCas9目标外活动的影响.
阐明SpCas9结合和裂变背后的结构机制.
改进预测CRISPR-Cas9目标外效应的方法.

主要方法:

在PAM序列附近设计和合成了具有不同不匹配的DNA目标.
进行了体外生化分析和基于细胞系的实验,以评估Cas9的活性.
利用分子动力学 (MD) 模拟来分析RNA-DNA双重稳定性和结构变化.

主要成果:

在不匹配的位置/自然和SpCas9活动之间显示出强烈的相关性.
在多个不匹配的目标部位 (PAM上游的15-18位) 观察到显著减少或取消Cas9活性.
医学模拟显示,特定的不匹配会导致RNA-DNA复合体的结构不稳定,与活动减少相关.

结论:

SpCas9的目标外活动受到PAM-遥远区域不匹配的强烈影响.
RNA-DNA双重稳定性是确定SpCas9目标识别和分裂效率的关键因素.
将双重稳定性与绑定能量计算相结合,可以提高CRISPR-Cas9目标外效应的预测精度.

关键词:

这就是CRISPR-Cas9的特征.DNA-RNA 形态稳定性的稳定性在PAM的远端.这是一个RMSD.不匹配的容忍度不匹配的容忍度在目标之外的效果.

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