Early detection of epilepsy could transform treatment outcomes for the millions worldwide living with this neurological condition. Current diagnosis relies heavily on witnessing seizures or catching them on imaging—often meaning years of undiagnosed episodes and delayed intervention. This proteomics breakthrough suggests blood tests might identify epilepsy risk years before clinical symptoms emerge.
Analyzing nearly 3,000 plasma proteins across 52,372 UK Biobank participants, researchers identified 103 proteins significantly associated with developing epilepsy over time. Two proteins stood out with particularly strong predictive power: neurofilament light polypeptide (NEFL), showing a 2.13-fold increased risk association, and growth differentiation factor 15 (GDF15) at 1.82-fold. Among 440 participants who developed epilepsy during follow-up, these protein signatures were detectable in blood samples collected years before clinical diagnosis.
The protein patterns revealed immune system dysfunction as a central driver, challenging traditional views of epilepsy as purely a neuronal electrical disorder. Network analysis identified four protein hubs orchestrating inflammatory cascades that may trigger seizure susceptibility. Intriguingly, these biomarkers correlated more strongly with stress-related events than genetic predisposition, suggesting environmental factors may be more influential than previously recognized.
This represents the largest plasma proteomics study of incident epilepsy to date, yet limitations remain significant. The cohort was predominantly of European ancestry, potentially limiting global applicability. More critically, the study establishes association rather than causation—whether these proteins actively contribute to epileptogenesis or merely reflect downstream consequences remains unclear. However, if validated in diverse populations, these findings could enable preventive interventions and personalized treatment strategies, potentially preventing the cognitive decline and quality-of-life impacts that accumulate with untreated seizures.