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Researchers developed a bioinformatic pipeline that uses small serine recombinase genes as genetic markers to identify both known and novel antiphage defense systems in bacteria. By analyzing reference genomes and metagenomes, they demonstrated that these recombinase genes are consistently located near antiphage defense systems across diverse bacterial species. The team experimentally validated their approach by discovering new classes of antiphage defenses, including KAP P-loop NTPases fused to antiphage domains and prokaryotic Schlafen proteins.
Why it matters
This work provides a high-throughput method for discovering bacterial defense mechanisms against phages, which is critical for advancing phage therapy as an alternative to antibiotics. Understanding how bacteria resist phage infection will help researchers design more effective therapeutic phages and predict potential treatment failures in clinical applications.
Understand the Science
by Shelby E. Andersen, Joshua M. Kirsch, Navtej Singh, Stephen R. Garrett, John C. Whitney, Jay R. Hesselberth, Breck A. Duerkop
Renewed interest in phage therapy has highlighted a need to understand how bacteria subvert phage infection through antiphage defense systems. Traditionally, strategies to identify antiphage defense systems lack throughput or have limitations for bacterial species where antiphage defense systems are understudied. Herein, we developed a bioinformatic pipeline that uses a small serine recombinase to identify known and unknown antiphage defense systems. Using this approach to query reference genomes and metagenomes, we show that small serine recombinase genes are genetically linked to antiphage defense systems and serve as bait for finding these systems across diverse bacterial phyla. Using co-transcription predictions and statistical analysis of protein domain abundances, we experimentally validated our bioinformatic approach by discovering that KAP P-loop NTPases are fused to putative antiphage domains and reinforce prokaryotic Schlafen proteins as a new class of antiphage defense. Our work shows that small serine recombinases are a reliable genetic marker for the discovery of antiphage defenses across diverse bacterial phyla.
Source: Small serine recombinases are markers for antiphage defense system discovery