Describing Myxococcus xanthus aggregation using Ostwald ripening equations for thin liquid films

Area of Science:

• Microbiology
• Developmental Biology
• Biophysics

Background:

• Myxococcus xanthus exhibits complex multicellular development when starved.
• Cells transition from swarming to forming multicellular aggregates and fruiting bodies.
• The mechanisms governing aggregate persistence versus disappearance are not fully understood.

Purpose of the Study:

• To develop a quantitative model predicting the fate of Myxococcus xanthus aggregates.
• To simulate and understand the factors influencing aggregate disappearance and persistence.
• To provide a framework for future experimental validation of developmental signaling.

Main Methods:

• Analysis of time-lapse microscopy movies of M. xanthus development.
• Modeling of cellular aggregation using principles of Ostwald ripening in thin liquid films.
• Experimental validation through tracking fluorescently labeled individual cells between aggregates.

Main Results:

• A model based on Ostwald ripening accurately predicted aggregate disappearance and persistence with 85% average accuracy.
• Experimental tracking confirmed that cell movement between aggregates correlates with aggregate fate.
• The model provides a biophysical explanation for aggregate dynamics during development.

Conclusions:

• Ostwald ripening principles offer a powerful framework for modeling bacterial multicellular development.
• Cellular movement and aggregate dynamics are key factors in determining developmental outcomes.
• This model simplifies the understanding of Myxococcus xanthus development and generates testable predictions.