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Transient Interphase Microtubules Appear in Differentiating Sponge Cells.

Sergei A Golyshev1, Yulia V Lyupina2, Oksana I Kravchuk2

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Dynamic cytoplasmic microtubules are transient structures in sponge cells, appearing only during cellular transdifferentiation. This finding highlights the cellular plasticity of these primitive animals.

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Area of Science:

  • Cell Biology
  • Evolutionary Biology
  • Marine Biology

Background:

  • Microtubules are essential for eukaryotic cell division and motility.
  • Sponges, as ancient animals, possess unique cellular structures like choanocytes with flagella containing microtubules.
  • Cytoplasmic microtubules in non-flagellated interphase sponge cells have been difficult to observe.

Purpose of the Study:

  • To investigate the presence and dynamics of cytoplasmic microtubules in sponge cells.
  • To understand the role of microtubules in sponge cell plasticity and differentiation.
  • To explore the evolutionary context of microtubule organization in early eukaryotes.

Main Methods:

  • Transcriptomic analysis to identify relevant genes.
  • Immunofluorescence microscopy to visualize microtubule structures.
  • Electron microscopy for high-resolution imaging.
  • Time-lapse recording to observe dynamic changes.

Main Results:

  • Microtubules were found to be transient structures in the sponge cytoplasm.
  • Their appearance is specifically linked to the activation of transdifferentiation processes.
  • This suggests microtubules are not constitutively present but dynamically regulated.

Conclusions:

  • Cytoplasmic microtubules in sponge cells are not permanent but transient structures.
  • These dynamic microtubules are associated with cellular plasticity and transdifferentiation.
  • This sheds light on microtubule dynamics in early animal evolution.