在大米中开发CRISPR/FrCas9系统,用于核心促进物编辑.
Hui Wang1,2, Jian Ding1,2, Jingyan Zhu1,2
1College of Agronomy, Anhui Agricultural University, Hefei, 230036 China.
aBIOTECH
|July 8, 2024
概括
来自Faecalibaculum rodentium的新FrCas9系统能够精确地编辑植物基因组,针对TATA序列进行高效的核心促进物修饰和基因表达控制.
科学领域:
- 植物生物技术 植物生物技术
- 基因组编辑 基因组编辑
- 分子生物学分子生物学
背景情况:
- 核心促进子突变可以显著改变基因表达.
- 对现有的Cas9系统来说,在促进体中准TA丰富的序列是一个挑战.
- 需要新的Cas9变种,具有不同的PAM特异性,用于植物基因组编辑.
研究的目的:
- 为植物基因组编辑设计和描述Faecalibaculum rodentium的新型FrCas9系统.
- 评估FrCas9针对米核心促进体中的TATA序列的效率和特异性.
- 开发基于FrCas9的工具,用于精确调整植物中的基因表达和基因编辑.
主要方法:
- 从Faecalibaculum rodentium获得的FrCas9系统的工程.
- 应用FrCas9进行大米基因组编辑,使用TATA序列作为PAMs.
- 分析突变效率,类型 (同卵性/双卵性),以及对基因表达和特征 (氨糖含量) 的影响.
主要成果:
- FrCas9有效地编辑了使用 TATA 序列作为 PAM 的米芯促进剂,对所有 16 种 NNTA PAM 都有效.
- 在calli中达到高达35.3%的编辑效率,在T0植物中达到31.3%的同卵性/双卵性突变.
- 演示了 FrCas9 对于多重编辑,双向编辑和开发 A·T 到 G·C 转换的基础编辑器的能力.
结论:
- FrCas9系统为植物核心促进器编辑提供了一个多功能工具集.
- 这项技术使得基因表达的微调和创建新型的生殖质能成为可能.
- FrCas9扩展了植物精确基因组工程的工具包,克服了以前系统的局限性.
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