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在Rickettsia rickettsii中发挥作用的诱导性促进体和CRISPRi等离子体的开发

Adam M Nock¹, Tina R Clark¹, Ted Hackstadt¹

¹Host-Parasite Interactions Section, Laboratory of Bacteriology, Rocky Mountain Laboratories, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana, USA.

Journal of bacteriology

|September 30, 2024

概括

研究人员为Rickettsia rickettsii开发了新的遗传工具,这是洛基山斑点热的原因. 为了更好地研究这种重要的细菌病原体,创建了一个可诱导的促进剂和CRISPR干扰 (CRISPRi) 系统.

科学领域:

分子微生物学分子微生物学
细菌遗传学细菌遗传学
病原体研究研究病原体研究.

背景情况:

瑞凯菌 (Rickettsia rickettsii) 导致落基山斑点热,但很难种植和基因操纵.
现有的遗传工具是有限的,阻碍了对这种有义务的细胞内细菌的研究.
条件基因表达对于研究潜在的有毒或必需基因至关重要.

研究的目的:

为Rickettsia rickettsii开发新的遗传工具.
为控制基因表达构建一种可诱导的促进器系统.
建立一个用于基因敲除的CRISPR干扰 (CRISPRi) 系统.

主要方法:

使用来自tet-On和Borrelia burgdorferi无水甲环素诱导系统的元素,结合一个特征化的皮性促进体 (rompB) 的元素,设计了一个可诱导的促进体系统.
通过诱导mScarlet光和构建一个通用表达向量来验证促销器的功能.
一个单向量CRISPRi系统被开发和测试用于R. rickettsii的基因沉默,针对rarP2和rapL基因.

主要成果:

一个用于R. rickettsii的功能诱导性促进器系统已成功构建和验证.
一个简化的,单向量的CRISPRi系统被证明可以有效地减少或沉默基因转录.
特定的基因,包括rarP2和rapL,是使用CRISPRi系统的目标.

结论:

开发的可诱导促进子和CRISPRi系统显著扩大了R. rickettsii研究的遗传工具箱.
这些工具使条件基因表达和特定基因敲除成为可能,促进对必需或有毒基因的研究.
这项工作为开发其他Rickettsiales病原体 (如Anaplasma和Ehrlichia) 的类似遗传工具提供了基础.

关键词:

克里斯普里是指克里斯普里.可诱导的促进子里克特西亚 (Rickettsia) 是一个古老的植物.遗传学遗传学遗传学是一个

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