增强的外核酶-Cas9系统促进多个核酸删除,在植物中具有更高的效率和更广泛的准范围
Rui Zhang1,2, Xu Tang1, Yao He1
1Integrative Science Center of Germplasm Creation in Western China (Chongqing) Science City, Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation, School of Life Sciences, Southwest University, Chongqing, 400715, China.
Journal of integrative plant biology
|January 22, 2026
概括
新的CRISPR-Cas9系统有效地在中产生大量的DNA删除,克服了研究基因调节和非编码RNA的小突变的局限性. 这些增强的工具扩大了植物的基因组编辑能力.
科学领域:
- 植物基因组学 植物基因组学
- 分子生物学分子生物学
- 生物技术是生物技术.
背景情况:
- 在植物中进行CRISPR-Cas9基因编辑通常会导致小插入/删除 (indels).
- 有限的突变概况阻碍了对非编码RNA和需要更大的基因组改变的调控元素的功能研究.
研究的目的:
- 开发增强的CRISPR-Cas9系统,以有效地产生大规模的除在米基因组.
- 扩大CRISPR-Cas9在植物功能基因组学中的实用性.
主要方法:
- 通过将外核酶与Cas9集成,开发了多重核酸删除Cas9 (MND-Cas9) 系统.
- 选和优化了外核酶 (RecJ,T5,TREX2,SbcB) 和Cas9变体 (Cas9-NG,SpG) 的情况.
- 嵌入了DNA结合域 (DBD) 以提高效率和删除大小.
主要成果:
- 使用TREX2或SbcB的MND-Cas9v1系统在不影响编辑效率的情况下产生了更大的删除.
- 带有DBD的MND-Cas9v2系统显著提高了编辑效率和删除大小.
- 与PAM放松的MND-Cas9-NG/SpGv2系统显示了更广泛的目标范围和更好的性能.
- 成功地应用MND-Cas9v2来淘汰OsMIR530并创建OsGhd2 3'UTR中的扩展删除,影响种子大小.
结论:
- MND-Cas9系统能够高效地在大米中产生大型基因组删除.
- 这些工具有助于对非编码RNA和调控序列的功能分析.
- 开发的外核酶-Cas9平台扩大了CRISPR-Cas9在植物基因组工程中的应用.
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