Self-organized intracellular twisters

Area of Science:

• Cellular biology
• Biophysics
• Developmental biology

Background:

• Global coordination of mass, energy, and information is vital for complex systems, including single cells.
• Large oocytes and embryos utilize rapid fluid flows for cytoplasmic reorganization.
• Cytoplasmic streaming in Drosophila oocytes is hypothesized to arise from microtubule-cargo motor interactions.

Approach:

• Combined theoretical modeling, computational simulations, and advanced imaging techniques.
• Employed a fast, accurate, and scalable numerical method to study fluid-structure interactions.
• Investigated the behavior of thousands of flexible fibers anchored in the cell cortex.

Key Points:

• Demonstrated the spontaneous emergence and evolution of cell-spanning vortices (twisters).
• Observed that these flows are characterized by rigid body rotation and secondary toroidal components.
• The findings support the role of hydrodynamic interactions in generating cytoplasmic streaming.

Conclusions:

• The study reveals the robust formation of vortices in Drosophila oocytes through microtubule-cargo motor dynamics.
• These emergent flows are likely essential for efficient mixing and transport of ooplasmic components.
• Provides a mechanistic understanding of cytoplasmic organization in large developing cells.