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Updated: May 3, 2026
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Single-cell Analysis of Bacillus subtilis Biofilms Using Fluorescence Microscopy and Flow Cytometry
Published on: February 15, 2012
20.4K
Single-cell imaging reveals spontaneous phenotypic sorting and bet-hedging in developing biofilms.
Biorxiv : the Preprint Server for Biology
|June 12, 2025
Summary
Phenotypic heterogeneity in Vibrio cholerae biofilms creates spatial patterns. High cyclic di-GMP (c-di-GMP) cells form the core, while low c-di-GMP cells form the periphery, enabling adaptation to changing environments.
Area of Science:
- Microbiology
- Systems Biology
- Biophysics
Background:
- Phenotypic heterogeneity's role in biofilm development is unclear.
- Cyclic di-GMP (c-di-GMP) is crucial for the transition from motile to sessile states in bacteria.
Purpose of the Study:
- To investigate how phenotypic heterogeneity influences biofilm architecture and development in Vibrio cholerae.
- To visualize and quantify intracellular c-di-GMP levels at single-cell resolution during biofilm formation.
Main Methods:
- Development of advanced imaging tools for tracking intracellular c-di-GMP levels.
- Single-cell resolution analysis of developing Vibrio cholerae biofilms.
- Integration of single-lineage tracing, mutant analysis, and agent-based modeling.
Main Results:
- Identified a bimodal distribution of c-di-GMP levels within biofilms.
- Observed spatial sorting: high c-di-GMP cells in the core, low c-di-GMP cells at the periphery.
- Demonstrated that differential viscosity and surface friction drive this pattern formation via matrix-dependent interactions.
Conclusions:
- Phenotypic heterogeneity and spatial sorting facilitate continuous emergence and shedding of planktonic cells, enhancing bacterial fitness.
- Introduced a 'differential drag mechanism' for pattern formation in multicellular systems.
- Expanded understanding of the biofilm lifecycle by emphasizing the functional importance of phenotypic heterogeneity.
