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Comprehensive genetic interaction analysis of the Bacillus subtilis envelope using double-CRISPRi
Byoung-Mo Koo1, Horia Todor1, Jiawei Sun2
1Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94158, USA.
Cell Systems
|October 4, 2025
Summary
This study uses double-CRISPR interference (CRISPRi) to map bacterial gene functions at scale. Researchers uncovered over 1,000 genetic interactions, revealing new insights into the Bacillus subtilis cell envelope and gene networks.
Area of Science:
- Microbiology
- Genetics
- Systems Biology
Background:
- Bacterial gene function discovery is challenging.
- Genome-scale genetic interaction analysis is difficult.
- Understanding gene networks is crucial for microbiology.
Purpose of the Study:
- To systematically quantify genetic interactions at scale in Bacillus subtilis.
- To uncover functional partners of genes, especially in the cell envelope.
- To demonstrate the utility of double-CRISPR interference (CRISPRi) for high-throughput gene network dissection.
Main Methods:
- Utilized double-CRISPR interference (CRISPRi) for systematic genetic interaction quantification.
- Focused on the Bacillus subtilis cell envelope, including essential genes.
- Developed an analysis pipeline and conducted experimental follow-ups.
Main Results:
- Discovered over 1,000 genetic interactions, including novel ones.
- Revealed shared and distinct roles of paralogous genes (mreB, mbl) in cell wall synthesis.
- Identified additional genes involved in cell division.
Conclusions:
- Double-CRISPRi is effective for high-throughput bacterial gene network analysis.
- Provided valuable insights into Bacillus subtilis gene function and cell envelope pathways.
- Offers a blueprint for future genome-wide genetic interaction studies in bacteria.
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