Encrypting the message: Bacterium turns host RNA into a target.

Legionella pneumophila modifies host mRNA to suppress inflammation using a newly identified bacterial effector.

• Why it matters: Understanding how bacteria manipulate host immune responses is crucial for developing targeted treatments against infections. This work addresses the gap in knowledge about bacterial effectors that alter host RNA rather than proteins.
• What they did: McCaffrey et al. identified a novel effector from Legionella pneumophila that specifically modifies host mRNA, revealing a new bacterial strategy to interfere with host immune signaling.
• The result: This discovery suggests that bacterial pathogens can target host RNA to dampen immune responses, opening new avenues for research into infection mechanisms and potential therapeutic interventions.