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Researchers studying methane emission reduction in peat microcosms found that viruses play a crucial role in shaping the microbiome response to catechin amendment. When catechin was added to suppress methane production, viruses infected and lysed fast-growing catechin-degrading bacteria, particularly targeting JAGFXR01 bacteria, releasing catechin breakdown products that other microbes could then use. This viral-mediated redistribution of nutrients sustained methane suppression by supporting diverse hydrogen-consuming bacteria that outcompete methanogens, revealing a previously unrecognized viral shunt mechanism in microbiome engineering strategies.
Why it matters
Understanding how viruses influence microbiome responses to interventions is essential for developing effective strategies to mitigate methane emissions from thawing permafrost and could improve microbiome engineering approaches in agricultural soils, oceans, and human health applications where prebiotics or nutrients are used to modify microbial communities.
Understand the Science
by James Riddell V., Rokaiya Nurani Shatadru, Garrett J. Smith, Bridget B. McGivern, Jared B. Ellenbogen, Sophie K. Jurgensen, Ami Fofana, Malak M. Tfaily, Kelly C. Wrighton, Matthew B. Sullivan
Human activities are accelerating permafrost thaw and subsequent methane emissions from increased microbial activity, prompting microbiome engineering efforts as an emissions mitigation strategy. We recently demonstrated that catechin amendment could drastically reduce methane emissions (>80%) in peat microcosms by enriching catechin-degrading prokaryotes that outcompeted methanogens for hydrogen. However, viral contributions to such microbiome-level responses remain unexplored and we hypothesized that viral dynamics could help shape the microbiome response as nutrient amendments may alter cellular physiology in ways that could induce lytic viral activity. Here, we performed virus eco-genomics analyses of the previously-studied time-resolved multi-omics data collected from catechin-amended peat microcosms. We conservatively identified 900 putatively lytic viral operational taxonomic units (vOTUs), with 41% predicted to infect active host genomes including the most transcriptionally active vOTUs predicted to infect key catechin-degrading genera (Clostridium and undescribed Bacillota JAGFXR01). Notably, a single JAGFXR01-targeting vOTU dominating the viral response (>40% of community viral transcription; 20–156-fold more abundant than its host), which we interpreted as induction resulting in intense lytic activity that could release catechin degradation intermediates to other community members. Consistent with this, gene expression analysis revealed elevated catechin-intermediate degradation and hydrogenase signals in 34 additional polyphenol-degrading metagenome-assembled genomes. These findings support a model consistent with a viral shunt-like process that extends our previous prokaryote-centric model: viral lysis of fast-growing catechin degraders redistributes phenolic intermediates to diverse phenol-degrading taxa that sustain methane suppression via hydrogen consumption. Beyond carbon cycling importance in this system, elucidating unintended virus-mediated responses to nutrient and prebiotic interventions will enable more predictable and effective microbiome engineering strategies across soil, ocean, and human ecosystems.
Source: Viruses help shape microbiome response to polyphenol rewiring of methane-suppressed peat microcosms