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Updated: Jun 16, 2026
Simultaneous Video-EEG-ECG Monitoring to Identify Neurocardiac Dysfunction in Mouse Models of Epilepsy
Published on: January 29, 2018
Spontaneous epileptic manifestations in a DCX knockdown model of human double cortex
Damien Lapray1, Irina Y Popova, Jennifer Kindler
1Institute of Physiology and Pathophysiology, University Medical Center of the Johannes Gutenberg University, Mainz, Germany.
Abstract:
Previous reports indicate that in utero knockdown of doublecortin (DCX) results in the genesis of a subcortical heterotopia reminiscent of the doublecortex observed in female patients with DCX mutations. It has also been shown that these rats display an increased susceptibility to convulsant agents and increased cortical neurons excitability; but it is presently unknown whether they display spontaneous seizures. Furthermore, the link between the size of heterotopia and the clinical manifestation remained to be elucidated. Using video-electrocorticogram recordings, we now report that DCX knockdown induces frequent spontaneous seizures commonly associated with myoclonic jerks in adult rats. Surprisingly, epilepsy occurred even in rats with very small subcortical heterotopias, as revealed by histological analysis of recorded animals. Moreover, the severity of the epileptic manifestations was positively correlated with both the size of the subcortical heterotopia and the age of recorded animals; thus, epileptic features were not detected in immature affected rats. In conclusion, our data demonstrate for the first time that subtle alterations can yield epilepsy and reveal a strong correlation between thicknesses of subcortical heterotopia, age of affected individuals and clinical impairment.
Insights
Doublecortin (DCX) knockdown in rats causes spontaneous seizures and epilepsy, even with small brain abnormalities. Seizure severity correlates with heterotopia size and age.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Epileptology
Background:
- In utero knockdown of doublecortin (DCX) causes subcortical heterotopia, similar to human DCX mutation-related disorders.
- Previous studies noted increased neuronal excitability and convulsant susceptibility in these models, but spontaneous seizure activity remained unconfirmed.
- The relationship between heterotopia size and clinical epilepsy severity was not understood.
Purpose of the Study:
- To investigate spontaneous seizure activity in rats with in utero DCX knockdown.
- To determine the correlation between subcortical heterotopia size and epilepsy manifestation.
- To elucidate the role of age in the development of epileptic features.
Main Methods:
- Video-electrocorticogram recordings were used to monitor seizure activity.
- Histological analysis was performed to assess the size of subcortical heterotopias.
- Correlation analyses were conducted between heterotopia size, age, and seizure severity.
Main Results:
- DCX knockdown induced frequent spontaneous seizures with myoclonic jerks in adult rats.
- Epilepsy was observed even in rats with minimal subcortical heterotopias.
- Seizure severity positively correlated with heterotopia size and animal age; immature rats did not exhibit epileptic features.
Conclusions:
- Subtle alterations in brain development, such as DCX knockdown, can lead to epilepsy.
- A strong correlation exists between subcortical heterotopia thickness, age, and the severity of epileptic manifestations.
- This study establishes a direct link between developmental brain abnormalities and spontaneous seizure disorders.
