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Assaying the Ability of Diffusible Signaling Molecules to Reorient Embryonic Spinal Commissural Axons
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Activity-driven proprioceptive synaptic refinement in the developing spinal cord by complement signaling mechanisms.

Chetan Nagaraja1, Serena Ortiz1, Akash R Murali1,2

  • 1Department of Physiology and Membrane Biology, University of California, Davis, Davis, CA, USA.

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Summary
This summary is machine-generated.

During early development, proprioceptive Ia afferents initially connect across spinal segments. This intersegmental connectivity is pruned by postnatal day 13, guided by proprioceptor activity and complement C1qA signaling.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Spinal Cord Circuits

Background:

  • Proprioceptive group Ia afferents are crucial for movement control, forming monosynaptic connections with spinal alpha-motor neurons.
  • The developmental mechanisms establishing precise segmental targeting of these afferents remain largely unknown.
  • Understanding this specificity is key to deciphering motor control development.

Purpose of the Study:

  • To investigate the developmental timeline of proprioceptive Ia afferent connectivity to motor neurons.
  • To determine the role of proprioceptor activity in establishing segmental specificity.
  • To elucidate the molecular pathways involved in eliminating excessive intersegmental connections.

Main Methods:

  • Ex vivo electrophysiology in neonatal mouse spinal cord preparations.
  • Anatomical tracing to identify Ia afferent-motor neuron connections.
  • Analysis of NaV1.6 conditional knockout and C1qA knockout mouse models.
  • Immunohistochemistry for C1qA expression.

Main Results:

  • Proprioceptive Ia afferents initially form both segmental and intersegmental monosynaptic connections.
  • Intersegmental connections are prominent in early postnatal development (P4-7) and largely absent by P11-13.
  • Impaired proprioceptor signaling (NaV1.6 cKO) or C1qA deficiency prolongs intersegmental connectivity.
  • Reduced C1qA expression was observed in NaV1.6 cKO mice, suggesting its involvement.

Conclusions:

  • A critical postnatal window exists for the refinement of proprioceptive Ia afferent connectivity.
  • Proprioceptor activity, mediated by C1qA, drives the elimination of excessive intersegmental connections.
  • This process establishes the precise segmental specificity required for mature motor control.