通过RAD51增强的同类基因修复有效的胚胎同类基因转化
Jonathan J Wilde1, Tomomi Aida1, Ricardo C H Del Rosario2
1Department of Brain & Cognitive Sciences, McGovern Institute for Brain Research, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.
Cell
|May 27, 2021
概括
研究人员发现,RAD51通过同类修复 (IHR) 在小鼠胚胎中增强了Cas9介导的同类基因. 这一发现为有效的基因编辑和创建疾病模型提供了一种新方法.
科学领域:
- 分子生物学
- 发育生物学
- 基因编辑
背景情况:
- 提高诺基因效率对于治疗应用,生物技术和疾病建模至关重要.
- 在早期哺乳动物胚胎中,interhomolog修复 (IHR) 的作用和频率仍在争论中.
- Cas9介导的基因编辑效率通常受到修复途径选择的限制.
研究的目的:
- 在小鼠胚胎中研究增强Cas9介导的同卵性诺基因效率的因素.
- 提供早期胚胎内源性同胞间修复 (IHR) 机制的证据和特征.
- 使用增强的IHR开发一种有效的基因转换方法.
主要方法:
- 使用CRISPR-Cas9基因编辑在小鼠胚胎和早期胚胎中.
- 通过多种分子和成像方法评估Knockin效率.
- 研究了链交换蛋白RAD51在促进IHR中的作用.
- 确定了额外的IHR促进因素和IHR事件特征.
主要成果:
- 在小鼠胚胎中,RAD51显著提高了Cas9介导的同卵性诺基因效率.
- 在早期小鼠胚胎中提供了内源性IHR机制的证据,RAD51可以增强这种机制.
- 通过使用外源性捐赠者从野生类型的胚胎中产生同卵性诺基因的能力.
- 在没有外源模板的情况下显示异构基因转化为同构基因.
- 确定了新的IHR促进因素,并描述了IHR事件的关键特征.
结论:
- 在小鼠胚胎中确实证明了interhomolog修复 (IHR) 的存在和实用性.
- RAD51是增强IHR和提高Cas9介导的同位基因效率的一个关键因素.
- 开发了一种有效的基因转换方法,可用于治疗和研究目的.
- 这些发现为改进的转基因生物和疾病模型铺平了道路.
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