Focal Seizures and Genetics: Inheritance Patterns and Risk

Some focal seizure disorders have a genetic basis and can be inherited. Known genetic epilepsies include familial temporal lobe epilepsy, Dravet syndrome (SCN1A mutations), and other channelopathies or neurodevelopmental gene disorders. However, not all focal seizures are genetic; acquired causes include brain injury, stroke, infections (meningitis, encephalitis), tumors, cortical dysplasia, and metabolic disorders.

If a genetic etiology is suspected—based on family history, early onset, syndromic features, or refractory seizures—referral to a neurologist and genetic counselor is recommended. Genetic testing (epilepsy panels, whole exome sequencing) can identify pathogenic variants, guiding prognosis, treatment selection (e.g., sodium channel blockers in SCN1A), and family planning.