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Neuronal polarity: an evolutionary perspective.

Melissa M Rolls1, Timothy J Jegla2

  • 1Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA 16802, USA mur22@psu.edu.

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Neuronal polarity, essential for directional signaling, likely evolved before bilaterians. Key cytoskeletal features for sorting molecules are present in both vertebrate and invertebrate neurons.

Keywords:
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Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Cell Biology

Background:

  • Directional information flow in vertebrate nervous systems relies on polarized distribution of signaling molecules to axons and dendrites.
  • While some neuronal features like the axon initial segment are thought to be vertebrate-specific, fundamental mechanisms of neuronal polarity may be more ancient.

Purpose of the Study:

  • To investigate the evolutionary origins of neuronal polarity.
  • To determine if key features of neuronal polarity are conserved across different animal groups.

Main Methods:

  • Comparative analysis of cytoskeletal features in vertebrate and invertebrate neurons.
  • Examination of molecular sorting mechanisms underlying neuronal asymmetry.

Main Results:

  • Two crucial cytoskeletal features for polarized sorting—a specialized axonal base region and polarized microtubules—are present in invertebrate neurons.
  • This suggests that the fundamental mechanisms for generating axons and dendrites are conserved in bilaterians.

Conclusions:

  • Neuronal polarity, characterized by distinct axons and dendrites, likely evolved in the common ancestor of bilaterians.
  • Future research should explore neuronal polarity in non-bilaterian animals like cnidarians and ctenophores to pinpoint the exact evolutionary timing.