Epilepsy in fragile X syndrome

Area of Science:

• Neurology
• Genetics
• Pediatrics

Background:

• Fragile X syndrome (Fra-X) is a genetic disorder associated with intellectual disability and developmental delays.
• Epilepsy is a known comorbidity in Fra-X, but its spectrum and associated features require further characterization.

Purpose of the Study:

• To investigate the prevalence and characteristics of seizures in a cohort of patients with fragile X syndrome.
• To identify potential subgroups of Fra-X patients based on seizure patterns and EEG findings.
• To explore the association between severe epilepsy, atypical facial dysmorphism, and Fra-X syndrome.

Main Methods:

• Retrospective analysis of 30 patients diagnosed with fragile X syndrome.
• Clinical assessment of seizure types, epilepsy severity, and response to treatment.
• Electroencephalogram (EEG) pattern analysis, including benign childhood epilepsy with central-temporal spikes (BCECTS).
• Phenotypic evaluation for facial dysmorphism.

Main Results:

• Approximately 20% of Fra-X patients in the cohort experienced seizures.
• Benign childhood epilepsy with central-temporal spikes (BCECTS) was identified in 10% of patients.
• Four distinct groups were identified based on seizure and EEG patterns, with one group exhibiting severe, intractable epilepsy.
• Two patients in the severe epilepsy group presented with atypical facial dysmorphism, distinct from classical Fra-X features.

Conclusions:

• The occurrence of seizures in fragile X syndrome is consistent with literature reports.
• A subgroup of Fra-X patients presents with severe, refractory epilepsy, potentially influenced by additional genetic factors.
• The presence of atypical facial dysmorphism in some severe epilepsy cases suggests complex genotype-phenotype correlations in Fra-X syndrome.