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Intracortical Network Effects Preserve Thalamocortical Input Efficacy in a Cortex Without Layers.
Julien Guy1, Alexandra Sachkova1, Martin Möck1
1Department of Neuroanatomy, Institute for Anatomy, University Medical Center, Georg-August-University, D-37075 Göttingen, Germany.
In reeler mice lacking cortical layers, spiny stellate neurons receive weakened thalamic input. Intracortical amplification may compensate for this, enabling sensory transmission in the reeler cortex.
Area of Science:
- Neuroscience
- Cortical Development
- Sensory Processing
Background:
- Layer IV (LIV) of the rodent somatosensory cortex features the barrel field, crucial for sensory input via thalamocortical axons.
- The reeler mouse mutant exhibits absent cortical layers, leading to mispositioned barrel-equivalent neuronal clusters.
Purpose of the Study:
- To investigate the cellular and synaptic properties of excitatory neurons in the reeler cortex.
- To characterize thalamic input to spiny stellate (SpS) neurons in reeler mice.
Main Methods:
- In vitro electrophysiology
- Optogenetics
- Subcellular channelrhodopsin-2-assisted circuit mapping (sCRACM)
Main Results:
- Reeler SpS neurons receive direct but diminished thalamic input.
- Thalamic input shows a dispersed spatial distribution across the somatodendritic arbor of reeler SpS neurons.
- Subtle alterations in functional connectivity are observed in the reeler mutant due to absent layering.
Conclusions:
- Reeler SpS neurons exhibit weakened thalamic innervation.
- Intracortical amplification mechanisms are proposed to compensate for diminished thalamic input, ensuring reliable sensory transmission in the reeler neocortex.
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