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Position-independent functional refinement within the vagus motor topographic map.

Takuya Kaneko1, Jonathan Boulanger-Weill2, Adam J Isabella3

  • 1Division of Basic Sciences, Fred Hutchinson Cancer Center, Seattle, WA 98109, USA.

Cell Reports
|September 26, 2024
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Vagus motor neurons refine their connections after initial mapping, even when misplaced. This process relies on synaptic transmission, suggesting experience shapes brain-body communication pathways.

Keywords:
CP: Neurosciencecircuit refinementdendritic remodelingdevelopmentneurosciencevagus nervezebrafish

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Systems Neuroscience

Background:

  • Motor neurons in the central nervous system form topographic maps, but spatially intermingled neurons innervate distinct targets.
  • Vagus nerve efferent neurons exemplify this, connecting diverse head and visceral targets for brain-body communication.
  • The mechanism by which these intermingled neurons achieve precise somatodendritic connectivity for targeted control remains unclear.

Purpose of the Study:

  • To investigate how vagus motor neurons establish specific input connectivity despite topographic intermingling.
  • To determine if circuit refinement occurs after the initial coarse topographic mapping of motor neurons.
  • To elucidate the role of synaptic transmission in refining motor neuron connectivity.

Main Methods:

  • Utilized zebrafish as a model organism.
  • Transplanted vagus motor neurons into ectopic positions within the topographic map.
  • Assessed peripheral responses to focal sensory stimulation.
  • Investigated the dependence of circuit refinement on motor neuron synaptic transmission.

Main Results:

  • Transplanted vagus motor neurons generated spatially appropriate peripheral responses, indicating circuit refinement post-topography.
  • This refinement process was dependent on motor neuron synaptic transmission.
  • The findings suggest an experience-dependent feedback mechanism shapes connectivity.

Conclusions:

  • Circuit refinement in vagus motor neurons occurs after the establishment of coarse topography.
  • Synaptic transmission is crucial for establishing specific input connectivity among intermingled motor neuron populations.
  • Experience-dependent periphery-to-brain feedback mechanisms likely guide the precise wiring of motor circuits for effective body control.