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设计的sgRNA捕获单链供体模板,并在DSB站点提供,以增强HDR

Somnath Rahangdale¹, Ashish Vishwakarma², Ranjana Chauhan¹

¹Molecular Biology & Biotechnology Division, CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.

International journal of biological macromolecules

|October 30, 2025

概括

研究人员设计了CRISPR-Cas9组件,用于增强基因组编辑. 一种新的sgRNA和ssODN组合显著提高了酵母的同质导向修复 (HDR) 效率,为精确的基因修改提供了灵活的工具.

科学领域:

分子生物学分子生物学
遗传学是一个遗传学.
生物技术是生物技术.

背景情况:

克里斯普尔-卡斯9系统能够在各种生物体中进行精确的基因组修改.
在酵母中高效的基因组编辑通常使用基于等离子体的Cas9-gRNA表达.
较高的真核生物通常需要集成的磁带或RNP传输用于CRISPR编辑.

研究的目的:

设计CRISPR组件以提高核准和编辑效率.
在Saccharomyces cerevisiae中进行增强的CRISPR编辑的概念证明.
开发一种灵活高效的同质导向修复 (HDR) 方法.

主要方法:

设计了一个双主机兼容的编码Cas9核酶的向量,与三个核定位信号 (Cas9-3xNLS) 融合.
用于体外DNA裂变试验的表达和纯化的复合Cas9-3xNLS蛋白.
修改后的sgRNAs具有ssODN回火和合成补充ssODN的末端扩展.
在酵母 (S. cerevisiae AH109) 中引入了各种sgRNA和ssODN的组合.

主要成果:

Cas9-3xNLS在S. cerevisiae中证明了基因组编辑的有效性.
将sgRNA与3'ssDNA定基因组合和ssODN与5'sgRNA补充基因组合,显著提高了HDR效率.
这种优化的组合导致了对canavanine耐药的殖民地增加了1.64倍,这表明了精确的停止密码子插入.
在5'端的sgRNA扩展没有提高编辑效率.

结论:

设计的Cas9-3xNLS和特定的sgRNA-ssODN组合增强了酵母中的同质导向修复.
这种方法为精确的基因组编辑提供了一种灵活和用户友好的方法.
该策略有可能提高各种真核生物体的HDR效率.

关键词:

情况9-3xNLS sgRNA末端延伸是什么意思 ssDNA 的定图案

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