使用长ssDNA和sgRNA的精确跨链交叉连接,高效精确地整合大型DNA序列
Zhigang Li1, Chengxu Li1, Shiyan Xiao1,2
1Department of Polymer Science and Engineering, Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.
ACS synthetic biology
|May 6, 2025
概括
一种新的基因编辑方法使用化学修饰的长单链DNA (lssDNA) 和光激活交叉链接来显著提高大型DNA插入的同质导向修复 (HDR) 效率和准确性.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 生物技术是生物技术.
背景情况:
- 同源导向修复 (HDR) 对于精确的基因组编辑至关重要,但在大型DNA序列编辑中面临局限性,包括低效率和非目标效应.
- 目前用于为HDR准备DNA捐赠者的方法,如酸化,具有固有的稳定性和效率问题.
研究的目的:
- 开发一种新的策略,以提高对大型DNA序列基因编辑的同质导向修复 (HDR) 的效率和准确性.
- 为了克服与当前HDR方法相关的低效率和非目标效应的局限性.
主要方法:
- 合成化学修饰的长单链DNA (lssDNA) 使用新的AOLP方法提高稳定性.
- 开发了一种光激活的结合策略,使用cyanovinylcarbazole nucleoside (CNVK) 进行lssDNA和sgRNA之间的精确跨链交联.
- 利用基于Cas9的基因编辑来诱导双链断裂 (DSB) 并促进HDR.
主要成果:
- 新型lssDNA捐赠者在K562,HEK293T和HepG2细胞中,与传统化捐赠者相比,显示出4-12倍高的内置效率 (KI).
- 与以前的商业 lssDNA 方法相比,在 HEK293T 细胞中实现了>4.7 倍的 HDR KI 精度提升.
- 在HEK293T细胞中成功插入基因大小1.4千基 lssDNA,前所未有的KI率约为36%.
结论:
- 开发的光激活结合策略与化学修饰的lssDNA显著提高了HDR效率和准确性,用于大型DNA插入.
- 这种方法为克服基因组编辑现有的挑战提供了一个有希望的解决方案,使精确和高效的大规模基因修改成为可能.
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