克里斯普尔-Cas9 HDR优化:RAD52,变质和5'-修饰的DNA模板在敲入小鼠的世代
Boris V Skryabin1, Daniela A Braun2, Helena Kaiser1
1Medical Faculty, Core Facility Transgenic Animal and Genetic Engineering Models (TRAM), University of Muenster, Münster, Germany.
iScience
|November 17, 2025
概括
提高动物模型的CRISPR-Cas9基因组编辑效率至关重要. 修改DNA捐赠者模板,特别是在他们的5岁时.
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:
- CRISPR-Cas9基因组编辑有助于创建动物疾病模型.
- 同源导向修复 (HDR) 的效率是精确基因组编辑的一个重大障碍.
- 生成条件淘汰 (cKO) 鼠标模型需要优化HDR策略.
研究的目的:
- 研究用于提高CRISPR-Cas9基因组编辑中的同质导向修复 (HDR) 的效率和精度的方法.
- 识别影响精确敲入模型生成的关键因素.
- 为优化生成Nup93基因的条件淘汰 (cKO) 鼠标模型.
主要方法:
- 将CRISPR-Cas9组件和各种DNA捐赠模板注入了2000多只小鼠的胚胎.
- 经过测试的策略包括dsDNA模板变性,RAD52补充和双crRNA向.
- 评估了捐赠者DNA5'端修饰 (5'-生物素,5'-C3间隔器) 对HDR效率和精度的影响.
主要成果:
- 改性化长5'-单酸化dDNA模板提高了精确的编辑和减少了模板的复制.
- 补充RAD52增加了ssDNA的整合,但也增加了模板的繁殖.
- 用两个crRNA针对反意义链增强了HDR精度.
- 5'-生物素修饰增加了单复制集成的8倍; 5'-C3间距修饰增加了正确编辑的小鼠的20倍.
结论:
- 对DNA捐赠者模板的特定修改显著提高了CRISPR-Cas9的HDR效率和精度.
- 捐赠者DNA的5'-C3间隔器修改是提高精确编辑小鼠产量的高效策略.
- 这些发现为改善基因工程动物模型的生成提供了实际方法.
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