Corticohippocampal circuit dysfunction in a mouse model of Dravet syndrome
- The University of Pennsylvania School of Medicine, United States
- The Children's Hospital of Philadelphia, United States
- Children's Hospital of Philadelphia, United States
- The University of Pennsylvania, United States
Abstract
Dravet syndrome (DS) is a neurodevelopmental disorder due to pathogenic variants in SCN1A encoding the Nav1.1 sodium channel subunit, characterized by treatment-resistant epilepsy, temperature-sensitive seizures, developmental delay/intellectual disability with features of autism spectrum disorder, and increased risk of sudden death. Convergent data suggest hippocampal dentate gyrus (DG) pathology in DS (Scn1a+/-) mice. We performed two-photon calcium imaging in brain slice to uncover a profound dysfunction of filtering of perforant path input by DG in young adult Scn1a+/- mice. This was not due to dysfunction of DG parvalbumin inhibitory interneurons (PV-INs), which were only mildly impaired at this timepoint; however, we identified enhanced excitatory input to granule cells, suggesting that circuit dysfunction is due to excessive excitation rather than impaired inhibition. We confirmed that both optogenetic stimulation of entorhinal cortex and selective chemogenetic inhibition of DG PV-INs lowered seizure threshold in vivo in young adult Scn1a+/- mice. Optogenetic activation of PV-INs, on the other hand, normalized evoked responses in granule cells in vitro. These results establish the corticohippocampal circuit as a key locus of pathology in Scn1a+/- mice and suggest that PV-INs retain powerful inhibitory function and may be harnessed as a potential therapeutic approach towards seizure modulation.
Data availability
All data generated or analyzed during this study are included in the manuscript and supporting files. Source data files for all Figures (1-8) and Tables (1-2) have been included and are also available via G-Node at:https://gin.g-node.org/GoldbergNeuroLab/Mattis-et-al-2022.Source code has been made available here:https://github.com/GoldbergNeuroLab/Mattis-et-al.-2022
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Mattis-et-al-2022G_Node, 10.12751/g-node.jubxbd.
Article and author information
Author details
Ethan Michael Goldberg
Funding
National Institute of Neurological Disorders and Stroke (R25 NS065745)
- Joanna H Mattis
National Institute of Neurological Disorders and Stroke (K08 NS097633)
- Ethan Michael Goldberg
National Institute of Neurological Disorders and Stroke (R01 NS110869)
- Ethan Michael Goldberg
Dana Foundation (David Mahoney Neuroimaging Grant)
- Ethan Michael Goldberg
Burroughs Wellcome Fund (Career Award for Medical Scientists)
- Ethan Michael Goldberg
National Institute of Neurological Disorders and Stroke (K08 NS121464)
- Joanna H Mattis
Institute for Translational Medicine and Therapeutics (Translational Biomedical Imaging Center (TBIC))
- Joanna H Mattis
- Ethan Michael Goldberg
The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.
Ethics
Animal experimentation: This study was performed in strict accordance with the recommendations in the Guide for the Care and Use of Laboratory Animals of the National Institutes of Health. All of the animals were handled according to approved institutional animal care and use committee (IACUC) protocol 21-001152 of The Children's Hospital of Philadelphia. All surgery was performed under isoflurane anesthesia, and every effort was made to minimize suffering.
Copyright
© 2022, Mattis et al.
This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.
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Corticohippocampal circuit dysfunction in a mouse model of Dravet syndrome
eLife 11:e69293.
https://doi.org/10.7554/eLife.69293
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