Engineering a gut bacterium depleted in industrialized microbiomes to survive malabsorption

Transferring the opuA betaine import operon into Muribaculum increases osmotic resistance and enables persistence during malabsorption in vivo.

• Why it matters: Industrialized microbiomes deplete Muribaculaceae and expose the gut to malabsorption-driven rises in intestinal osmolality, creating a need to understand and overcome osmotic sensitivity.
• What they did: The study identified opuA from industrialization-enriched Bacteroides as an osmotic resistance system absent from Muribaculaceae, then engineered Muribaculaceae and transferred opuA into Muribaculum for in vitro testing and in vivo malabsorption persistence.
• The result: Osmotic stress-response genes are enriched in industrialization-associated bacteria versus industrialization-depleted taxa, suggesting osmotic resistance may contribute to adaptation to the industrialized gut.