Bacterial effector modifies host messenger RNA to promote virulence.

A bacterial effector, FadA, modifies host mRNA through oxidative damage, increasing oxo 8 G modifications and promoting Legionella pneumophila virulence.

• Why it matters: Understanding how bacterial effectors manipulate host RNA reveals new mechanisms of infection and immune evasion, filling a critical knowledge gap in host-pathogen interactions.
• What they did: Researchers used RNA-interactome capture to identify effectors bound to host mRNA during infection, discovering FadA’s localization to the nucleus and its NADPH-oxidase activity that causes mRNA oxidation.
• The result: FadA-induced mRNA modifications suppressed cytokine responses and enhanced bacterial persistence, highlighting a novel post-transcriptional strategy for bacterial virulence.