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Regulation of Thalamic and Cortical Network Synchrony by Scn8a
Christopher D Makinson1, Brian S Tanaka2, Jordan M Sorokin1
1Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA 94304, USA.
Neuron
|February 28, 2017
Summary
Mutations in the Scn8a gene disrupt thalamocortical circuits, causing distinct epilepsy types. Loss of Scn8a function leads to altered excitability and synaptic inhibition, generating pathological brain oscillations.
Area of Science:
- Neuroscience
- Molecular Biology
- Epilepsy Research
Background:
- Voltage-gated sodium channel (VGSC) mutations are linked to severe epilepsies.
- Scn8a is a critical VGSC gene implicated in neurological function.
Purpose of the Study:
- To elucidate the mechanisms by which Scn8a mutations cause distinct seizure phenotypes.
- To investigate the role of Scn8a in cortical and thalamocortical circuit function.
Main Methods:
- Analysis of Scn8a gene function in vivo.
- Electrophysiological recordings to assess neuronal excitability and synaptic function.
- Investigation of thalamocortical circuit dynamics.
Main Results:
- Loss of Scn8a function alters intrinsic excitability of thalamic reticular (RT) cells.
- Failure in recurrent RT synaptic inhibition was observed.
- These deficits enhance thalamocortical network synchrony, leading to pathological oscillations and absence epilepsy.
Conclusions:
- Scn8a dysfunction contributes to both convulsive seizure resistance and absence epilepsy through distinct mechanisms.
- Disruption of the RT-RT synapse is a novel pathological mechanism for epilepsy.
- Absence epilepsy can originate from thalamic dysfunction due to single gene disruption.
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