Bacteria regulate collective behaviour by mechanosensing cell-cell collisions.

Pseudomonas aeruginosa uses mechanosensing of cell-cell collisions to regulate collective behavior, enabling adaptive surface exploration and navigation in dense populations.

• Why it matters: Understanding how bacteria coordinate collective movement is crucial for insights into biofilm formation and infection spread, yet the mechanisms behind local regulation remain unclear.
• What they did: The study employed live imaging, single-cell tracking, and simulations to show that collision-induced reversals modulate collective order, with wild-type cells adapting their movement based on local density.
• The result: This feedback mechanism enhances navigational ability in complex environments, preventing trapping at boundaries and demonstrating that bacterial organization is actively regulated rather than purely emergent.