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A condensate dynamic instability orchestrates actomyosin cortex activation.

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Summary
This summary is machine-generated.

In C. elegans oocytes, short-lived protein condensates drive actomyosin cortex activation. These condensates exhibit chemically driven growth and disassembly, preventing uncontrolled actin nucleation.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Biophysics

Background:

  • Actomyosin cortex activation is crucial for the oocyte-to-embryo transition.
  • This process involves the formation of a contractile actomyosin cortex.

Purpose of the Study:

  • To investigate the role of protein condensates in actomyosin cortex activation during C. elegans oocyte development.
  • To elucidate the dynamics and mechanisms governing these cortical condensates.

Main Methods:

  • Phase portrait analysis of individual cortical condensate dynamics.
  • Investigation of chemical reaction kinetics governing condensate growth and disassembly.

Main Results:

  • Thousands of short-lived protein condensates, rich in F-actin, N-WASP, and ARP2/3 complex, form an active micro-emulsion.
  • Condensate growth is chemically driven, obeying mass action kinetics, rather than diffusion.
  • Condensate dynamics exhibit instability, leading to controlled growth and disassembly.

Conclusions:

  • Cortical condensate dynamic instability suppresses micro-emulsion coarsening.
  • Chemically driven kinetics ensure size-independent reactions and prevent runaway actin nucleation.
  • These condensates are essential for forming the initial cortical actin meshwork during development.