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Area of Science:

  • Cell Biology
  • Mycology
  • Biophysics

Background:

  • Cytoplasmic streaming is vital for intracellular transport in many cell types.
  • Its role in multicellular fungal hyphae is less understood, particularly regarding structural functions.

Purpose of the Study:

  • To investigate the function of cytoplasmic streaming in fungal hyphae.
  • To identify novel roles of streaming beyond transport, specifically in forming cellular subcompartments.

Main Methods:

  • Live-cell imaging to visualize cytoplasmic flow and nuclear behavior.
  • Computer simulations to model microfluidic dynamics within hyphae.
  • Genetic analysis to assess the role of specific factors like SPA-19.

Main Results:

  • Cytoplasmic streaming generates microfluidic eddies upstream of septal pores in fungal hyphae.
  • These eddies immobilize nuclei, leading to multinucleate aggregate formation and SPA-19 accumulation.
  • Nuclei trapped in eddies are essential for reinforcing septal pores, as evidenced by pore degeneration when SPA-19 is absent.

Conclusions:

  • Cytoplasmic streaming in fungal hyphae creates subcellular niches (eddies) that promote nuclear aggregation and differentiation.
  • These eddies play a critical role in maintaining hyphal integrity by reinforcing septal structures.
  • Subcellular compartments can arise dynamically through self-organization driven by directed cytoplasmic flow.