ArticleThe ISME journal2026
Oxidative stress constrains evolution of bacteriophage host-range diversity.
Article in The ISME journal, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Reactive oxygen species (ROS) are essential for cellular signalling and redox homeostasis, but their accumulation causes cellular oxidative stress. In inflammatory bowel disease, oxidative stress is linked to chronic inflammation and alterations in the gut microbiota. We hypothesised that these alterations may result from the impact of ROS on the interactions between bacteria and their viruses, bacteriophages. We followed the evolution of three Escherichia coli strains and a virulent bacteriophage in a chemostat under continuous growth and studied the impact of oxidative stress on this community. We show that both the bacteriophage and its three hosts persisted in the system over 10 days, but the relative abundance of bacteriophages was decreased in the presence of ROS. Oxidative stress also limited bacteriophage population diversity by favouring the selection of specialist bacteriophages with a narrower host range. Concomitantly, ROS accelerated the evolution of bacterial resistance to bacteriophages and drove the fixation of genomic mutations in genes related to cell surface structures or located in mobile genetic elements. These results highlight that oxidative stress impacts the evolutionary dynamics between bacteria and bacteriophages with consequences for microbiota diversity and potential implications in the context of intestinal inflammation.
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