Epilepsy in Dcx knockout mice associated with discrete lamination defects and enhanced excitability in the hippocampus.

Patients with Doublecortin (DCX) mutations have severe cortical malformations associated with mental retardation and epilepsy. Dcx knockout (KO) mice show no major isocortical abnormalities, but have discrete hippocampal defects. We questioned the functional consequences of these defects and report...

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Autores principales: Marika Nosten-Bertrand, Caroline Kappeler, Céline Dinocourt, Cécile Denis, Johanne Germain, Françoise Phan Dinh Tuy, Soraya Verstraeten, Chantal Alvarez, Christine Métin, Jamel Chelly, Bruno Giros, Richard Miles, Antoine Depaulis, Fiona Francis
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Publicado: Public Library of Science (PLoS) 2008
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spelling oai:doaj.org-article:aff3bab36c654b1b90feacad4d89878a2021-11-25T06:11:54ZEpilepsy in Dcx knockout mice associated with discrete lamination defects and enhanced excitability in the hippocampus.1932-620310.1371/journal.pone.0002473https://doaj.org/article/aff3bab36c654b1b90feacad4d89878a2008-06-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/18575605/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203Patients with Doublecortin (DCX) mutations have severe cortical malformations associated with mental retardation and epilepsy. Dcx knockout (KO) mice show no major isocortical abnormalities, but have discrete hippocampal defects. We questioned the functional consequences of these defects and report here that Dcx KO mice are hyperactive and exhibit spontaneous convulsive seizures. Changes in neuropeptide Y and calbindin expression, consistent with seizure occurrence, were detected in a large proportion of KO animals, and convulsants, including kainate and pentylenetetrazole, also induced seizures more readily in KO mice. We show that the dysplastic CA3 region in KO hippocampal slices generates sharp wave-like activities and possesses a lower threshold for epileptiform events. Video-EEG monitoring also demonstrated that spontaneous seizures were initiated in the hippocampus. Similarly, seizures in human patients mutated for DCX can show a primary involvement of the temporal lobe. In conclusion, seizures in Dcx KO mice are likely to be due to abnormal synaptic transmission involving heterotopic cells in the hippocampus and these mice may therefore provide a useful model to further study how lamination defects underlie the genesis of epileptiform activities.Marika Nosten-BertrandCaroline KappelerCéline DinocourtCécile DenisJohanne GermainFrançoise Phan Dinh TuySoraya VerstraetenChantal AlvarezChristine MétinJamel ChellyBruno GirosRichard MilesAntoine DepaulisFiona FrancisPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 3, Iss 6, p e2473 (2008)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Marika Nosten-Bertrand
Caroline Kappeler
Céline Dinocourt
Cécile Denis
Johanne Germain
Françoise Phan Dinh Tuy
Soraya Verstraeten
Chantal Alvarez
Christine Métin
Jamel Chelly
Bruno Giros
Richard Miles
Antoine Depaulis
Fiona Francis
Epilepsy in Dcx knockout mice associated with discrete lamination defects and enhanced excitability in the hippocampus.
description Patients with Doublecortin (DCX) mutations have severe cortical malformations associated with mental retardation and epilepsy. Dcx knockout (KO) mice show no major isocortical abnormalities, but have discrete hippocampal defects. We questioned the functional consequences of these defects and report here that Dcx KO mice are hyperactive and exhibit spontaneous convulsive seizures. Changes in neuropeptide Y and calbindin expression, consistent with seizure occurrence, were detected in a large proportion of KO animals, and convulsants, including kainate and pentylenetetrazole, also induced seizures more readily in KO mice. We show that the dysplastic CA3 region in KO hippocampal slices generates sharp wave-like activities and possesses a lower threshold for epileptiform events. Video-EEG monitoring also demonstrated that spontaneous seizures were initiated in the hippocampus. Similarly, seizures in human patients mutated for DCX can show a primary involvement of the temporal lobe. In conclusion, seizures in Dcx KO mice are likely to be due to abnormal synaptic transmission involving heterotopic cells in the hippocampus and these mice may therefore provide a useful model to further study how lamination defects underlie the genesis of epileptiform activities.
format article
author Marika Nosten-Bertrand
Caroline Kappeler
Céline Dinocourt
Cécile Denis
Johanne Germain
Françoise Phan Dinh Tuy
Soraya Verstraeten
Chantal Alvarez
Christine Métin
Jamel Chelly
Bruno Giros
Richard Miles
Antoine Depaulis
Fiona Francis
author_facet Marika Nosten-Bertrand
Caroline Kappeler
Céline Dinocourt
Cécile Denis
Johanne Germain
Françoise Phan Dinh Tuy
Soraya Verstraeten
Chantal Alvarez
Christine Métin
Jamel Chelly
Bruno Giros
Richard Miles
Antoine Depaulis
Fiona Francis
author_sort Marika Nosten-Bertrand
title Epilepsy in Dcx knockout mice associated with discrete lamination defects and enhanced excitability in the hippocampus.
title_short Epilepsy in Dcx knockout mice associated with discrete lamination defects and enhanced excitability in the hippocampus.
title_full Epilepsy in Dcx knockout mice associated with discrete lamination defects and enhanced excitability in the hippocampus.
title_fullStr Epilepsy in Dcx knockout mice associated with discrete lamination defects and enhanced excitability in the hippocampus.
title_full_unstemmed Epilepsy in Dcx knockout mice associated with discrete lamination defects and enhanced excitability in the hippocampus.
title_sort epilepsy in dcx knockout mice associated with discrete lamination defects and enhanced excitability in the hippocampus.
publisher Public Library of Science (PLoS)
publishDate 2008
url https://doaj.org/article/aff3bab36c654b1b90feacad4d89878a
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