Sep 2026· Trends in Microbiology· 1 citation· 86 references
Medicine
TL;DR
This work reviews prior debates in evolutionary biology and proposes a four-part framework to evaluate the case for a defense mechanism being an evolved adaptation, offering a research roadmap to address functional controversies across microbiology.
Abstract
Recent years have witnessed a rapid expansion in bacterial defense mechanisms. Alongside established defenses against molecular parasites, hundreds of novel mechanisms are being described annually, contributing to an ever-expanding 'bacterial immune system'. Terms like 'defense' and 'immune' are often used as shorthand for an observed anti-infection phenotype, but can also imply an evolutionary adaptation with a specific anti-infection function. Despite the field's growth, no agreed-upon framework exists for identifying defense adaptations. When is a defense mechanism an evolved adaptation? Here, we review prior debates in evolutionary biology and propose a four-part framework to evaluate the case for a defense mechanism being an evolved adaptation. Beyond bacterial immunity, these criteria offer a research roadmap to address functional controversies across microbiology.
Pathogens, including bacteria, viruses, parasites and fungi, continuously adapt to evade host immune defenses. To counteract these threats, the host orchestrates a complex immune response, deploying specialized cellular network and chemicals that collaboratively identify and eradicate the intruders. The innate immune r...
Mayada Hussain Ali· International Journal of Mul...· 0 citations
Structural change, protein assembly and spatial organization shape immune activation, and how phages employ counter-defense strategies that disrupt these processes are highlighted.
Landon J. Getz, Sam R. Fairburn, Karen L. Maxwell· Nature Structural & Molecula...· 0 citations
Bacterial antiviral defense systems are highly diverse and unevenly distributed across populations, such that different strains carry distinct immune repertoires that together form a pan-immune system. Restriction-modification (RM) systems are the most abundant bacterial defense systems and exemplify this architecture,...
Joseph Westley, Tatiana Dimitriu, Andrew C. Matthews et al.· bioRxiv· 0 citations
This review synthesizes current evidence to show that phylogenetically diverse ESKAPE pathogens have convergently evolved conserved strategies to evade host immunity under comparable selective pressures, and identifies conserved host-directed therapeutic targets that may complement conventional antimicrobial therapy ac...
U. Nabieva, Dilorom Abdusamatova, Aziz Kubaev et al.· European Journal of Microbio...· 0 citations
Organisms face ubiquitous threats from pathogens, and in response hosts have evolved a cascade of defenses to avoid, resist, or tolerate infection. While these stepwise defenses may act independently, they can be pleiotropically linked via shared molecular mechanisms, regulation, and crosstalk. Here, we tested the exte...
Michael Blazanin, Nowmita Nasir, Emilie Haniak et al.· bioRxiv· 0 citations
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