Neonatal genetic epilepsies display convergent white matter microstructural abnormalities

Area of Science:

• Neuroscience
• Developmental Biology
• Pediatric Neurology

Background:

• White matter development is rapid in neonates and influenced by neuronal activity.
• Pathological neuronal activity, such as seizures, may impact white matter structure and contribute to network dysfunction.
• Neonatal epilepsy offers a unique model to study early white matter development and seizure effects.

Purpose of the Study:

• To investigate if neonatal seizures, independent of brain injury or congenital anomalies, are associated with altered white matter microstructure.
• To identify specific white matter regions affected by seizures in the neonatal period.

Main Methods:

• Retrospective case-control study involving term neonates.
• Cases: Neonates with confirmed/suspected genetic epilepsy and normal brain MRI, excluding other white matter impacting conditions.
• Controls: Healthy neonates with normal brain MRI.
• White matter microstructure assessed using quantitative mean diffusivity (MD) on MRI.

Main Results:

• Significantly lower mean diffusivity (MD) was observed in the genu of the corpus callosum in neonates with epilepsy compared to controls.
• This finding remained significant after controlling for gestational age and postmenstrual age at MRI.
• The study included 22 cases and 22 controls.

Conclusions:

• Neonatal seizures, even without apparent brain injury, are associated with abnormal corpus callosum microstructure.
• This suggests a convergent microstructural abnormality in the corpus callosum across various genetic causes of neonatal epilepsy.
• Further research is required to elucidate the precise nature, etiology, and functional consequences of seizure-associated white matter alterations in neonates.