Asynchronous suppression of visual cortex during absence seizures in stargazer mice

Nature Communications
Jochen MeyerStelios Smirnakis

Abstract

Absence epilepsy is a common childhood disorder featuring frequent cortical spike-wave seizures with a loss of awareness and behavior. Using the calcium indicator GCaMP6 with in vivo 2-photon cellular microscopy and simultaneous electrocorticography, we examined the collective activity profiles of individual neurons and surrounding neuropil across all layers in V1 during spike-wave seizure activity over prolonged periods in stargazer mice. We show that most (~80%) neurons in all cortical layers reduce their activity during seizures, whereas a smaller pool activates or remains neutral. Unexpectedly, ictal participation of identified single-unit activity is not fixed, but fluctuates on a flexible time scale from seizure to seizure. Pairwise correlation analysis of calcium activity reveals a surprising lack of synchrony among neurons and neuropil patches in all layers during seizures. Our results demonstrate asynchronous suppression of visual cortex during absence seizures, with potential implications for understanding cortical network function during EEG states of reduced awareness.

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Citations

Oct 28, 2019·Annals of Neurology·Fadi AeedYitzhak Schiller
Apr 7, 2020·The Journal of Clinical Investigation·Asante HatcherJeffrey L Noebels
Jul 21, 2020·Epilepsy Currents·Ala Somarowthu, Ethan M Goldberg
May 22, 2020·Brain : a Journal of Neurology·Vincenzo CrunelliFrançois David
Mar 7, 2021·Cell Calcium·Ala SomarowthuEthan M Goldberg
May 25, 2021·Epilepsy Currents·Matthew C Weston

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Absence Epilepsy

Absence epilepsy is a common seizure disorder in children which can produce chronic psychosocial sequelae. Discover the latest research on absence epilepsies here.