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Pip5k1γ regulates axon formation by limiting Rap1 activity.

Danila Di Meo1,2, Trisha Kundu1,2, Priyadarshini Ravindran1

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Phosphatidylinositol-4,5-bisphosphate (PI(4,5)P2) generated by Pip5k1γ is crucial for single axon formation in neurons. Impaired Pip5k1γ function leads to multiple axons by overactivating the Fyn/C3G/Rap1 pathway.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Neuronal differentiation involves establishing polarity through axon and dendrite formation.
  • Initially, neurons extend multiple neurites with axonal potential.
  • Axon selection is regulated by feedback signals promoting axon formation and inhibiting others.

Purpose of the Study:

  • To investigate the role of Pip5k1γ in regulating single axon formation.
  • To elucidate the molecular mechanisms by which Pip5k1γ controls neurite selection.

Main Methods:

  • Investigated the function of Pip5k1γ in neuronal differentiation.
  • Analyzed the regulation of C3G and Rap1 pathways.
  • Utilized hyper-osmotic shock to modulate membrane tension.
  • Employed constitutively active Pip5k expression for rescue experiments.

Main Results:

  • Pip5k1γ is essential for single axon formation, acting as a negative feedback regulator.
  • Pip5k1γ generates phosphatidylinositol-4,5-bisphosphate (PI(4,5)P2), controlling C3G and Rap1 activity.
  • Disrupting Pip5k1γ hyper-activates the Fyn/C3G/Rap1 pathway, causing supernumerary axon formation.
  • Modulating membrane tension via osmotic shock mimicked Pip5k1γ impairment, increasing Rap1 activity and inducing multiple axons.
  • Restoring Pip5k1γ function reversed the supernumerary axon phenotype.

Conclusions:

  • PI(4,5)P2-dependent membrane properties are critical for limiting C3G and Rap1 activity.
  • This limitation ensures the proper extension of a single axon during neuronal development.
  • Pip5k1γ plays a key role in this process by regulating PI(4,5)P2 levels.