The transcriptional response of Yersinia pseudotuberculosis to macrophage-released metabolites during growth within synthetic microcolonies.

Yersinia pseudotuberculosis exhibits a distinct transcriptional response to macrophage-released nitric oxide and itaconate, with peripheral bacteria primarily activating nitrosative stress genes.

• Why it matters: Understanding how bacteria adapt to immune cell metabolites is crucial for developing strategies to combat persistent infections, as microcolonies are common in invasive diseases.
• What they did: The study used microdroplet-grown Yptb with reporter systems and RNA-seq analysis to examine bacterial subpopulations exposed to activated macrophages, focusing on nitrosative stress and itaconate responses.
• The result: Findings show that protection against nitric oxide is the main bacterial response, while response to itaconate is limited, revealing potential targets for disrupting bacterial survival within immune environments.