Bacteria leaving a colony intentionally leave behind a small garrison of antibiotic-tolerant cells to restart the population if things go wrong.
April 26, 2026
Original Paper
A branching cell-fate decision in biofilm dispersal enables long-term surface persistence
bioRxiv · 10.64898/2026.04.24.720661
The Takeaway
Biofilms are notoriously difficult to kill because they act as a protective shield for bacteria. When these colonies disperse to find new homes, it was assumed that every cell followed the same path. Instead, a specific subpopulation makes a decision to stay behind and form a seed bank. These stay-behind cells are highly resistant to antibiotics and can quickly repopulate the area. This strategic hedging ensures the infection is never fully cleared, explaining why some chronic infections keep coming back.
From the abstract
Biofilms are the most ancient multicellular communities on Earth, representing a primitive developmental system that protects microbes from threats. Biofilm dispersal, whereby bacteria exit biofilms, is critical for the spread of pathogens to new infection sites. Here, using Vibrio cholerae, we show that dispersal events are accompanied by a branching cell-fate decision. While ~90% of cells disperse, a viable subpopulation remains within a residual matrix. This post-dispersal biofilm community (