CRISPR-Cas system positively regulates virulence of Salmonella enterica serovar Typhimurium
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View abstract on PubMed
Summary
This summary is machine-generated.The CRISPR-Cas system in Salmonella regulates virulence by controlling invasion and antioxidant genes. Disabling this system attenuates the pathogen, highlighting its role in Salmonella pathogenesis.
Area Of Science
- Microbiology
- Bacterial Pathogenesis
- Gene Regulation
Background
- Salmonella, a foodborne pathogen, utilizes a type I-E clustered regularly interspaced short palindromic repeats (CRISPR)-CRISPR associated (Cas) system.
- The function of this CRISPR-Cas system in regulating Salmonella virulence was previously unclear.
Purpose Of The Study
- To investigate the role of the CRISPR-Cas system in Salmonella virulence.
- To determine how the CRISPR-Cas system influences invasion, proliferation, and antioxidant defense mechanisms.
Main Methods
- Deletion of CRISPR arrays and the Cas operon in Salmonella.
- In vitro assays using intestinal epithelial cells and macrophages.
- In vivo infection models in Caenorhabditis elegans and BALB/c mice.
Main Results
- CRISPR-Cas knockout strains exhibited defects in invasion and proliferation due to repression of virulence genes.
- The CRISPR-Cas system positively regulates antioxidant genes (OmpW, katG, ahpC, soda, sodCI), contributing to oxidative stress resistance.
- Knockout strains showed attenuation in vivo, hypersensitivity to antimicrobial peptides, complement proteins, and oxidative stress, linked to suppressed SPI-1 and SPI-2 related genes.
Conclusions
- The CRISPR-Cas system is a key regulator of Salmonella virulence.
- This system plays a significant role in the pathogen's defense against host-imposed stresses and contributes to invasion and proliferation.
- Understanding the CRISPR-Cas system's function provides insights into Salmonella pathogenesis and potential therapeutic targets.
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