精确的CRISPR/Cpf1基因组编辑系统在Deinococcus radiodurans中具有卓越的DNA修复机制
Zijing Chen1, Jing Hu1, Jingli Dai1
1Institute of Biophysics, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, China; MOE Key Laboratory of Biosystems Homeostasis & Protection, Zhejiang University, Hangzhou, Zhejiang, China.
使用CRISPR/Cpf1系统改进了Deinococcus radiodurans的基因组编辑. DNA修复途径,特别是同源重组 (HR) 和单链DNA化 (SSA),影响编辑效率和保真性.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 迪诺科克 (Deinococcus radiodurans) 是基因组稳定的模型生物,因为它有效地进行同源重组 (HR) 来修复双链DNA断裂 (DSB).
- 其强大的DNA修复机制使其对工业应用具有吸引力,但高效的基因组编辑具有挑战性.
研究的目的:
- 为D. radiodurans.开发和优化一个高效的CRISPR/Cpf1基因组编辑系统.
- 研究DNA修复基因在CRISPR/Cpf1编辑的效率和真实性中的作用.
主要方法:
- 开发并优化了使用各种Cas效应蛋白的双质粒CRISPR/Cpf1系统.
- 在13种缺乏特定DNA修复因子的D. radiodurans突变菌株中引入了CRISPR/Cpf1系统.
- 在不同的基因背景下评估了编辑效率和非目标效应.
主要成果:
- 在D. radiodurans.中建立了一个高效的CRISPR/Cpf1系统,用于精确的模板依赖性突变发生.
- 在CRISPR/Cpf1编辑中,依赖ReCA的HR是必不可少的.
- 在缺乏DdrB (单链DNA回火蛋白) 的菌株中,编辑效率得到了提高,这表明HR和SSA通路竞争.
- 在pprI淘汰杆菌株中发生了非目标突变,突出显示了DNA损伤反应调节的重要性.
结论:
- 优化的CRISPR/Cpf1系统可以在D. radiodurans.中进行高效和精确的基因组编辑.
- 了解HR和SSA途径之间的相互作用对于最大限度地提高编辑效率至关重要.
- 精确调节DNA损伤反应通路对于D. radiodurans.的高保真基因组编辑至关重要.
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