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Yoko Arakaki1, Hiroko Kawai-Toyooka1, Yuki Hamamura2

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Tetrabaena socialis, a simple multicellular alga, exhibits rotational asymmetry and cytoplasmic bridges, key traits for multicellularity evolution. These features, found in more complex volvocine algae, suggest an early origin in the evolution of multicellular life.

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Area of Science:

  • Evolutionary biology
  • Cell biology
  • Algal biology

Background:

  • Volvocine green algae serve as a model for studying the evolution of multicellularity.
  • Key morphological features in multicellular volvocine species include cell rotational asymmetry and cytoplasmic bridges.
  • These features have not been previously investigated in the basal colonial species Tetrabaena socialis.

Purpose of the Study:

  • To investigate the presence of cell rotational asymmetry and cytoplasmic bridges in Tetrabaena socialis.
  • To understand the evolutionary origins of multicellularity within the volvocine lineage.

Main Methods:

  • Established synchronous cultures of Tetrabaena socialis.
  • Conducted immunofluorescence microscopy to observe cellular structures.
  • Performed ultrastructural observations on developing embryos.

Main Results:

  • Mature Tetrabaena socialis colonies showed rotational asymmetry in microtubular rootlets and basal body separation among the four identical cells.
  • Cytoplasmic bridges were observed between protoplasts in developing Tetrabaena socialis embryos, even after new flagella formation.
  • These findings are consistent with features observed in more complex volvocine species like Gonium pectorale and Volvox carteri.

Conclusions:

  • The presence of rotational asymmetry and cytoplasmic bridges in Tetrabaena socialis suggests these traits evolved early in the common ancestor of colonial volvocine algae.
  • These morphological attributes likely contributed to the increase in cell number and complexity in subsequent multicellular volvocine evolution.
  • Tetrabaena socialis represents a fundamental model for understanding the transition to integrated multicellularity.