Convergent genomic evolution of human gut bacteria along an industrialization gradient.

Industrialized human gut commensal bacteria show convergent genome evolution, with strains exhibiting expanded proteome size and greater pangenome fluidity linked to recent HGT events.

• Why it matters: It remains unclear whether human-associated environments shape adaptive genome evolution in gut commensals, especially across industrialization gradients.
• What they did: The study generated isolate genome collections across geographies, lifestyles, species, and strains, comparing isolate genomes to metagenome-assembled genomes and analyzing gene/variant patterns across multiple species.
• The result: Convergent, lifestyle-specific adaptations were detected in stress response, cell-envelope remodeling, and central metabolism, supporting a framework for mechanisms of microbial adaptation to rapidly changing human environments.

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