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High-Throughput Live Imaging of Microcolonies to Measure Heterogeneity in Growth and Gene Expression
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Repulsive expansion dynamics in colony growth and gene expression.

Yangxiaolu Cao1, John Neu1, Andrew E Blanchard2

  • 1Department of Biomedical Engineering, Duke University, Durham, North Carolina.

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Cellular colonies expand through continuous growth, pushing outer cells outward. This study introduces a repulsive-expansion kinetics model for efficient simulation of colony growth and gene expression dynamics.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Mathematical Modeling

Background:

  • Cellular spatial expansion is fundamental to tissue development and pattern formation.
  • Colony expansion is typically driven by cell division and outward displacement of peripheral cells.
  • This process generates a complex velocity field within the colony.

Purpose of the Study:

  • To develop a simplified kinetic framework for simulating cellular spatial expansion.
  • To enable accurate and efficient modeling of growth and gene expression dynamics in cell colonies.
  • To provide mechanistic insights into colony development.

Main Methods:

  • Approximation of colony expansion using coarse-grained repulsive-expansion kinetics.
  • Development of a mathematical framework for simulation.
  • Validation across various cell types and sizes, including non-spherical cells.

Main Results:

  • The repulsive-expansion kinetics framework accurately simulates colony growth and gene expression.
  • The model is efficient and robust, handling variations in cell shape and size.
  • The simplified framework facilitates mechanistic understanding of spatial pattern generation.

Conclusions:

  • Repulsive-expansion kinetics offers a powerful and efficient approach for modeling cellular colony expansion.
  • This framework is applicable to diverse biological systems, including microorganisms, plant, and mammalian cells.
  • The model provides valuable mechanistic insights into tissue development and spatial pattern programming.