通过CRISPR/Cas9n介导的编辑系统,优化Streptomyces fradiae的基因组编辑效率
Yuhan Wu1, Hui Jin1, Qiang Yu1
1State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, College of Life Sciences, Hubei University, Wuhan, China.
Applied and environmental microbiology
|January 22, 2025
概括
这项研究开发了Streptomyces fradiae的高效CRISPR/Cas9n基因组编辑系统,克服了基因修饰方面的挑战,并改善了neomycin的生产. 新系统促进了快速的基因删除和整合,为高性能工程菌株铺平了道路.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物技术是生物技术.
背景情况:
- 杆菌是抗菌天然产品的重要来源.
- 现有的S. fradiae基因组编辑工具耗时且劳动密集.
- 高GC含量和复杂的基因组结构对S. fradiae的基因操纵构成了挑战.
研究的目的:
- 在Streptomyces fradiae.建立一个高效的CRISPR/Cas9n基因组编辑系统.
- 克服传统同源重组方法的局限性.
- 为了减少与S. fradiae中CRISPR/Cas9相关的毒性和非目标效应.
主要方法:
- 设计的CRISPR/Cas9n系统包含了尼克酶和高保真性突变.
- 对于受控的Cas9表达,提奥斯特雷普顿诱导的促进剂 (P*thi).
- 该系统用于基因删除,片段删除,基因替代和外源基因整合的应用.
主要成果:
- 减少了CRISPR/Cas9n系统的毒性和非目标效应.
- 有效地删除单个基因 (neoI,77.8%) 和大型DNA片段 (13.3 kb,44%).
- 成功的基因替代 (P*thi,100%) 和外源基因整合 (vgbS,67.8%).
- 所有的修改都在S. fradiae中增强了neomycin的合成.
结论:
- 为了S. fradiae,一个高效的CRISPR/Cas9n基因组编辑工具包被建立起来.
- 该系统有助于开发高性能菌素生产菌株.
- 为具有高GC含量基因组的生物体进行基因组编辑提供技术指南.
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