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Updated: Jun 8, 2025

High-Throughput Live Imaging of Microcolonies to Measure Heterogeneity in Growth and Gene Expression

High-Throughput Live Imaging of Microcolonies to Measure Heterogeneity in Growth and Gene Expression

Published on: April 18, 2021

Cell shape affects bacterial colony growth under physical confinement.

M Sreepadmanabh¹, Meenakshi Ganesh^1,2, Pratibha Sanjenbam¹

¹National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bangalore, India.

Nature Communications

|November 8, 2024

Summary

Bacterial cell shape influences growth in confined environments. Rod-shaped bacteria form larger colonies and grow better under physical constraints than spherical bacteria.

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Area of Science:

Microbiology
Biophysics
Cell Biology

Background:

Traditional bacterial culture methods (liquid or flat-plate) primarily consider biochemical interactions.
These methods do not replicate the physical confinement found in natural bacterial habitats like soil pores or mucus.
Natural bacterial niches are complex, disordered microenvironments with specific material properties.

Purpose of the Study:

To investigate how the physical properties of the microenvironment affect bacterial growth under confinement.
To compare the growth of bacteria with different shapes (aspect ratios) in simulated gut mucus.

Main Methods:

Utilized three-dimensional matrices with viscoelastic properties mimicking gut mucus.
Tested the influence of physical confinement on bacterial colony formation and population growth.
Compared the behavior of low aspect ratio (spherical) and high aspect ratio (rod-shaped) bacteria.

Main Results:

Spherical bacteria formed compact, spherical colonies in confined environments.
Rod-shaped bacteria produced elongated colonies with increased surface area, enhancing nutrient access.
High aspect ratio bacteria exhibited more robust population growth under confinement compared to low aspect ratio bacteria.

Conclusions:

Environmental physical constraints significantly influence bacterial growth.
Bacterial cell shape plays a selective role in adaptation to physical confinement.
Physical properties of the microenvironment are critical factors in bacterial ecology and evolution.