IBD is associated with species-specific changes in gut microbial gene diversity.

Inflammatory bowel disease is linked to species-specific changes in gut microbial genome-level diversity, revealing distinct within-species genetic variation patterns across IBD patients versus controls.

• Why it matters: Strain-level variation may uncover how gut commensals persist under chronic intestinal inflammation, yet it is unclear how IBD-associated stressors reshape population genetics within colonizing species.
• What they did: The study used metagenomic analyses across a panel of gut commensals present in IBD patients and controls, quantifying within-individual bacterial diversity and assessing gene/function divergence across the same species.
• The result: Certain genes and functions show different levels and kinds of genetic divergence in the same species between groups, with IBD-enriched functions involving motility and iron-scavenging, suggesting stress-linked selection signals.

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