Epilepsy Is Heterogeneous in Early-Life Tuberous Sclerosis Complex

Area of Science:

• Neurology
• Pediatrics
• Genetics

Background:

• Epilepsy is common in tuberous sclerosis complex (TSC), often starting early and proving difficult to treat.
• Significant individual variability exists in epilepsy presentation and severity within the TSC population.

Purpose of the Study:

• To define distinct epilepsy profiles in young children with TSC using prospective seizure data.
• To investigate the relationship between epilepsy profiles and developmental outcomes at 36 months.

Main Methods:

• Longitudinal follow-up of children aged 0-36 months with TSC.
• Daily seizure diaries maintained by caregivers for seizure type, onset, and count.
• Hierarchical clustering analysis of six seizure burden metrics to identify epilepsy profiles.

Main Results:

• Epilepsy affected 79% of participants, with 93% experiencing onset before 12 months.
• Two distinct epilepsy profiles (favorable and unfavorable) were identified based on seizure burden.
• Higher seizure burden was associated with poorer developmental outcomes at 36 months.

Conclusions:

• Epilepsy in TSC is phenotypically diverse, with at least two discernible subpopulations based on seizure burden.
• Early, targeted treatment strategies for TSC-related epilepsy should consider these distinct phenotypic profiles.