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Related Experiment Video

Updated: Apr 19, 2026

Author Spotlight: Efficiently Eliminating Bacteriophages from Infected Salmonella Cultures Using Lipopolysaccharides

Author Spotlight: Efficiently Eliminating Bacteriophages from Infected Salmonella Cultures Using Lipopolysaccharides

Published on: June 28, 2024

Bacteriophage exclusion, a new defense system.

Rodolphe Barrangou¹, John van der Oost²

¹Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, Raleigh, NC, USA.

The EMBO Journal

|December 16, 2014

Summary

Bacterial survival depends on phage resistance. Researchers discovered the bacteriophage exclusion (BREX) system, a novel mechanism providing innate immunity against viruses in bacteria.

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Published on: September 28, 2022

Area of Science:

Microbiology
Bacteriology
Virology

Background:

Microbial survival is threatened by viral predation.
Various phage resistance systems exist, including R-M, Abi, Argonaute, and CRISPR-Cas.
Bacterial genomes may harbor undiscovered resistance mechanisms.

Purpose of the Study:

To identify novel bacteriophage resistance systems in bacterial genomes.
To characterize the newly discovered BREX system.

Main Methods:

Bioinformatic analysis of bacterial genomes.
Experimental validation of BREX function against phages.

Main Results:

A novel, widespread bacteriophage resistance system named BREX was identified.
BREX confers innate immunity against both virulent and temperate phages.
The BREX system is prevalent in diverse bacterial species.

Conclusions:

BREX represents a significant addition to the known repertoire of bacterial phage defense mechanisms.
This discovery highlights the potential of exploring genomic dark matter for novel biological systems.
BREX provides a new avenue for understanding and potentially engineering phage resistance in bacteria.