通过内生可编程内核酶基基因组编辑工具开发Limosilactobacillus reuteri的底盘
Qiujin Guo1, Yiting Yan1, Zhenting Zhang1,2
1National Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070 Hubei, P.R. China.
ACS synthetic biology
|November 7, 2023
概括
研究人员开发了一种新的CRISPR-Cas9基因编辑系统,用于Limosilactobacillus reuteri,从而实现了高效的基因操纵. 这一突破加速了用于治疗疾病的活生物治疗产品 (LBPs) 的开发.
科学领域:
- 微生物学 微生物学
- 合成生物学 合成生物学
- 基因工程是一种基因工程.
背景情况:
- 来自益生菌的活生物治疗产品 (LBPs) 对于疾病治疗至关重要.
- Limosilactobacillus reuteri是LBP发展的一个有前途的益生菌,但由于长时间的编辑周期,基因操纵具有挑战性.
研究的目的:
- 在L. reuteri中识别和表征一种内源的CRISPR-Cas9系统,以实现高效的基因工程.
- 为L. reuteri建立一个强大的基因组编辑平台,以促进LBP的开发.
主要方法:
- 在L. reuteri03中确定了一种II-A亚型CRISPR-Cas9系统,包括内源Cas9 (LrCas9) 和其广泛的PAM识别 (3'-NDR).
- 重编程LrCas9用于基因删除,点突变,大片段删除和基因整合.
- 选的304L. reuteri菌株用于内源性内核酶分布.
主要成果:
- 在基因删除 (95.46%),点突变 (86.36%) 和基因整合 (73.9%) 中实现了高效率.
- 成功删除了一个40kb的片段,并集成了一个1743bp的片段.
- 在98.36%的L. reuteri菌株中发现可编程内核酶,表明其广泛适用.
结论:
- 开发了一种基于内源CRISPR-Cas9.9的L. reuteri新型高效基因组编辑系统.
- LrCas9系统促进了功能遗传研究,并加速了LBP的构建.
- 这个平台可以在大多数L. reuteri菌株中进行基因操纵,从而推进益生菌工程.
相关概念视频
Conservative Site-specific Recombination and Phase Variation
6.0K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
6.0K
CRISPR/Cas9 Genome Editing
17
The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
17


