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Self-Assembly of Microtubule Tactoids
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Self-organized intracellular twisters.

Sayantan Dutta1,2, Reza Farhadifar2, Wen Lu3

  • 1Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ.

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Summary
This summary is machine-generated.

Global coordination is vital for complex systems. In Drosophila oocytes, fluid flows involving microtubules and molecular motors spontaneously generate cell-spanning vortices for cytoplasmic reorganization and transport.

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Area of Science:

  • Cellular biology
  • Biophysics
  • Developmental biology

Background:

  • Complex systems, from cities to cells, rely on coordinated mass, energy, and information flow.
  • Large oocytes and embryos utilize rapid cytoplasmic fluid flows for reorganization.
  • In Drosophila oocytes, cortical microtubules and molecular motors are hypothesized to drive cytoplasmic streaming.

Approach:

  • Combined theoretical modeling, computational simulations, and advanced imaging techniques.
  • Developed a fast, accurate, and scalable numerical method for fluid-structure interactions.
  • Investigated the behavior of thousands of flexible fibers representing cytoskeletal components.

Key Points:

  • Demonstrated the spontaneous emergence and evolution of robust, cell-spanning vortices (twisters) in simulated Drosophila oocytes.
  • Characterized these vortices as primarily rigid body rotation with secondary toroidal components.
  • Highlighted the role of hydrodynamic interactions between cortically anchored microtubules and molecular motors.

Conclusions:

  • Cytoplasmic streaming in Drosophila oocytes robustly arises from microtubule-cargo motor interactions.
  • These emergent vortices are crucial for rapid mixing and transport of ooplasmic components.
  • The findings provide insights into fundamental principles of self-organization in biological fluid dynamics.