Epilepsy phenotypes in siblings with Norrie disease

Area of Science:

• Genetics
• Neurology
• Ophthalmology

Background:

• Norrie disease is a rare X-linked recessive disorder primarily causing congenital blindness.
• Epileptic seizures are an infrequently reported symptom in Norrie disease patients.
• Understanding the link between Norrie disease and epilepsy is limited.

Observation:

• This study reports on three brothers diagnosed with Norrie disease due to a deletion in the NDP gene.
• Two of the brothers experienced epileptic seizures, with one case showing drug resistance and the other responding to specific antiepileptic medications.
• Electroencephalography (EEG) revealed epileptiform discharges in the occipital regions for all three siblings.

Findings:

• The study confirms the manifestation of epilepsy in siblings with Norrie disease.
• Epilepsy presentation and drug response varied among the affected brothers.
• Consistent occipital epileptiform discharges were observed via EEG in all affected siblings.

Implications:

• This research expands the understanding of neurological comorbidities in Norrie disease.
• It suggests a potential link between NDP gene mutations and epilepsy, particularly with occipital involvement.
• Further investigation into the mechanisms of epilepsy in Norrie disease is warranted.