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Dominic Chomchai1, Marcin Leda2, Adriana Golding3

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This study reveals that active RhoA accumulates before total RhoA in cell cortex waves, helping differentiate between models of Rho GTPase self-organization.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Rho GTPases are crucial for cell morphogenesis, self-organizing into dynamic patterns like waves.
  • Existing theoretical models for these patterns involve complex feedback loops.
  • Distinguishing between models is challenging due to limited simultaneous measurements of molecular concentrations and biomechanics.

Purpose of the Study:

  • To investigate the relationship between RhoA membrane enrichment and RhoA activity.
  • To differentiate between theoretical models of Rho GTPase self-organization.
  • To analyze the dynamics of RhoA during cortical wave propagation.

Main Methods:

  • Simultaneous imaging of total RhoA and active RhoA in propagating waves.
  • Observation of Rho activity and F-actin polymerization dynamics.
  • Utilizing findings to test competing theoretical models.

Main Results:

  • Active RhoA accumulation precedes total RhoA accumulation in nascent waves.
  • This temporal difference provides a key metric for model discrimination.
  • The study successfully distinguished between two prominent theoretical models.

Conclusions:

  • The dynamics of RhoA membrane enrichment and activity are distinct.
  • The findings offer critical experimental data to refine models of Rho GTPase pattern formation.
  • This work advances understanding of fundamental cell processes driven by Rho GTPases.