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The synaptic basis of activity-dependent eye-specific competition.

Chenghang Zhang1, Swapnil Yadav1, Colenso M Speer1

  • 1Department of Biology, University of Maryland, College Park, MD 20742, USA.

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Summary

Activity-dependent presynaptic maturation drives eye-specific synapse competition in the developing mouse visual system. This process refines binocular vision by organizing inputs in the brain, impacting vesicle organization and synapse density.

Keywords:
CP: Developmental biologyCP: Neuroscienceactivity-dependent developmentdLGNeye-specific segregationretinal wavesretinogeniculatesubsynaptic domainsuper-resolution microscopysynaptic competitionsynaptic vesiclesynaptogenesis

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Synaptic Plasticity

Background:

  • Binocular vision relies on precise wiring of eye-specific neural pathways.
  • Axons from both eyes initially overlap in the dorsal lateral geniculate nucleus (dLGN) and segregate through activity-dependent competition.
  • Understanding the nanoscale molecular mechanisms of this segregation is crucial for visual system development.

Purpose of the Study:

  • To investigate the nanoscale molecular reorganization of developing retinogeniculate synapses.
  • To determine if eye-specific differences exist at the presynaptic and postsynaptic levels during synaptic refinement.
  • To elucidate the role of spontaneous retinal activity in synapse maturation and segregation.

Main Methods:

  • Utilized eye-specific tract tracing in mouse models.
  • Employed volumetric super-resolution imaging to visualize nanoscale synaptic structures.
  • Genetically disrupted spontaneous retinal activity to assess its functional impact.

Main Results:

  • Identified eye-specific differences in presynaptic vesicle pool size and active zone association early in retinogeniculate refinement.
  • Found no evidence of eye-specific differences in subsynaptic domain number, size, or alignment during development.
  • Disruption of retinal activity reduced synapse density, delayed eye-specific vesicle organization, and impaired subsynaptic domain maturation.

Conclusions:

  • Activity-dependent presynaptic maturation is a key mechanism underlying synaptic competition in the mammalian visual system.
  • Presynaptic organization, rather than postsynaptic structure, appears to drive initial eye-specific synapse segregation.
  • Spontaneous retinal activity is essential for normal synapse maturation and refinement during visual system development.