Modeling the role of gap junctions between excitatory neurons in the developing visual cortex.

Area of Science:

• Neuroscience
• Computational Neuroscience
• Developmental Neuroscience

Background:

• Gap junctions connect excitatory neurons in the developing mammalian visual cortex.
• Developmental gap junction coupling influences adult chemical synapse formation and orientation preference.
• Blocking gap junctions diminishes the correlation between developmental coupling and adult synaptic connections.

Purpose of the Study:

• To model the role of gap junctions in the developing mammalian visual cortex.
• To investigate how gap junction coupling affects synapse formation and orientation preference development.
• To understand the interplay between gap junctions and synaptic plasticity in shaping cortical maps.

Main Methods:

• Constructed a simplified computational model of the developing mouse visual cortex.
• Incorporated spike-timing-dependent plasticity for feedforward and recurrent synapses.
• Simulated the effects of gap junction coupling on neuronal synchrony and synapse formation.

Main Results:

• Neuronal synchrony among gap-junction-coupled cells promotes the formation of strong recurrent synapses.
• Synchrony leads to similar orientation preferences in coupled cells, an effect reduced by higher coupling density.
• Gap junction coupling, alongside the timing of feedforward and recurrent synapse development, dictates the final orientation preference map.

Conclusions:

• Gap junctions play a critical role in coordinating neuronal activity during development.
• Synchrony mediated by gap junctions is a key mechanism for establishing functional connectivity and feature maps in the visual cortex.
• The timing of synaptic plasticity relative to gap junction coupling significantly impacts the emergent cortical architecture.