Reprogramming Mycobacterium tuberculosis CRISPR System for Gene Editing and Genome-wide RNA Interference Screening

Area of Science:

• Microbiology
• Genetics
• Molecular Biology

Background:

• Tuberculosis (TB) remains a leading global infectious disease mortality cause.
• Developing new anti-TB drugs and vaccines is hindered by complex genetic manipulation techniques for Mycobacterium tuberculosis.
• Efficient genetic tools are crucial for understanding M. tuberculosis and advancing therapeutic development.

Purpose of the Study:

• To develop and validate an efficient endogenous CRISPR/Cas10 gene editing and RNA interference (RNAi) system for Mycobacterium tuberculosis.
• To establish a simplified genetic manipulation method that avoids exogenous proteins and minimizes proteotoxicity.
• To enable genome-wide screening for identifying essential M. tuberculosis genes.

Main Methods:

• Harnessing the endogenous type III-A CRISPR/Cas10 system of M. tuberculosis.
• Utilizing a single mini-CRISPR array plasmid for transformation.
• Employing DNA high-throughput sequencing for gene editing validation.
• Applying the system for single- and multiple-gene RNA interference (RNAi).
• Conducting genome-wide RNAi screening for functional genomics.

Main Results:

• Demonstrated efficient and specific gene knock-in/knock-out in M. tuberculosis.
• Successfully applied the system for both single- and multiple-gene RNAi.
• Identified M. tuberculosis genes regulating in vitro and intracellular growth through genome-wide RNAi screening.

Conclusions:

• The developed endogenous CRISPR/Cas10 system offers a simple, efficient, and versatile tool for M. tuberculosis functional genomics.
• This system facilitates gene editing and RNAi, accelerating the exploration of M. tuberculosis biology.
• The tool holds significant potential for the development of novel anti-TB drugs and vaccines.