在植物中使用与I型CRISPR系统配对的crRNA进行有针对性的大片段删除
Yingnan Li1, Boyu Huang2,3, Jian Chen1
1State Key Laboratory of Maize Bio-breeding, National Maize Improvement Center, Department of Plant Genetics and Breeding, China Agricultural University, Beijing, China.
Plant biotechnology journal
|August 29, 2023
概括
我们开发了一个新的CRISPR-Cas植物基因组编辑系统,Dvu I-C系统,能够精确地删除高达20kb的大片段. 这种工具可以提高基因编辑效率,提高玉米和大米等作物的特异性.
科学领域:
- 分子生物学分子生物学
- 植物生物技术 植物生物技术
- 基因编辑技术的技术
背景情况:
- 克里斯普尔-卡斯系统是多功能基因组编辑工具.
- I型CRISPR-Cas系统可以进行远程删除,但需要优化精度.
- 现有的系统在控制植物中的大型碎片删除方面存在局限性.
研究的目的:
- 开发一种新的CRISPR-Cas系统,用于精确地删除植物基因组中的大型碎片.
- 提高植物基因组工程I型CRISPR-Cas系统的可控性和特异性.
- 建立一个高效的基因组编辑工具,以产生稳定的转基因作物.
主要方法:
- 使用Cas11c. 开发一个紧的Cascade-Cas3 Dvu I-C系统.
- 配对导向RNAs (crRNAs) 的应用用于指导大片段删除.
- 在玉米和大米中测试系统的效率和特异性.
主要成果:
- Dvu I-C 系统实现了至少 20 kb 的可控制的大片段删除.
- 配对crRNA设计显著改善了I-E型系统的删除可控性.
- 该系统在产生稳定的转基因玉米和大米生产线方面表现出高的编辑效率 (高达86.67%).
- Dvu I-C系统对间隔器长度和不匹配的敏感性提高了目标特异性.
结论:
- 开发的Dvu I-C系统是精确,大片段删除植物基因组的强大工具.
- 该系统为植物基因组编辑应用提供了更好的可控性和特异性.
- Dvu I-C 系统有助于高效地产生稳定的转基因作物,进步植物生物技术.
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