Cortical and Subcortical Network Dysfunction in a Female Patient With NEXMIF Encephalopathy

Area of Science:

• Neuroscience
• Genetics
• Epileptology

Background:

• Developmental and epileptic encephalopathies (DEE) represent the most severe epilepsy forms.
• NEXMIF mutations are recently identified as a cause of DEE in females, presenting with myoclonic-atonic epilepsy and nonconvulsive status.
• Understanding the neurobiological underpinnings of DEE subtypes is crucial for targeted therapies.

Purpose of the Study:

• To investigate the brain structural and functional changes associated with a novel NEXMIF de novo mutation.
• To correlate neuroimaging findings with the clinical presentation of recurrent absence status with eyelid myoclonia.
• To elucidate the role of specific brain networks in this DEE phenotype.

Main Methods:

• Advanced neuroimaging techniques were employed.
• A case study of a patient with a novel NEXMIF de novo mutation was conducted.
• Analysis focused on identifying alterations in brain structure and function within specific networks.

Main Results:

• The study identified alterations in the visual pericalcarine cortex and middle frontal gyrus.
• These regions are implicated in epilepsy phenotypes exhibiting visual sensitivity and eyelid myoclonia with absences.
• Neuroimaging findings provide a potential explanation for the observed clinical phenotype.

Conclusions:

• Novel NEXMIF mutations can lead to DEE with a distinct phenotype of absence status and eyelid myoclonia.
• Advanced neuroimaging reveals specific brain network alterations correlating with this clinical presentation.
• This study highlights the importance of genetic factors and neuroanatomical correlates in understanding severe epilepsies.