A collective mechanism for phase variation in biofilms

Area of Science:

• Microbiology
• Systems Biology
• Evolutionary Biology

Background:

• Microbial biofilms are complex communities where individual microbes act as communal organisms.
• Phenotypic diversity within biofilms is crucial for community structure and function.
• Phase variation is a key mechanism generating this diversity.

Purpose of the Study:

• To propose and theoretically model a collective mechanism for phase variation in biofilms.
• To investigate the role of gene transfer agents in driving microbial cooperation and diversity.
• To predict biofilm population structure and growth dynamics based on this mechanism.

Main Methods:

• Development of a theoretical framework for collective phase variation.
• Application of the theory to model biofilm population dynamics.
• Quantitative comparison of model predictions with experimental data.

Main Results:

• The proposed collective mechanism, based on gene transfer agents, quantitatively describes experimental observations.
• Intercellular horizontal gene transfer rate emerged as the sole adjustable parameter.
• The model successfully predicts biofilm population structure and growth dynamics.

Conclusions:

• Collective phase variation mediated by gene transfer agents is a viable mechanism for generating biofilm diversity.
• This mechanism provides a general framework for understanding the emergence of microbial cooperation.
• The study offers quantitative insights into biofilm community assembly and maintenance.