Genetic Epilepsy

The field of genetic epilepsy has witnessed remarkable advancements leading to improved diagnosis, prognosis, and management. This chapter provides a comprehensive overview of genetic epilepsy, exploring its diverse etiology and pathophysiological mechanisms. Genetic factors are estimated to contribute to 50–60% of epilepsy cases, encompassing single-gene epilepsies, complex inheritance patterns, and genetic modifiers interacting with environmental factors. Genetic variants disrupt various aspects of brain development, cell growth, ion channel regulation, or synaptic function, among other mechanisms, ultimately increasing seizure susceptibility. Different types of genetic variants, including single nucleotide variants, indels, structural variants, and nucleotide repeat expansions, are discussed in detail. Genetic testing plays a vital role in the diagnosis of epilepsy, particularly in early-onset cases and those with neurodevelopmental comorbidities. Next-generation sequencing techniques, such as gene panels and whole-exome sequencing, are the primary methods for genetic testing. The interpretation of genetic results requires multidisciplinary collaboration and genetic counseling is important to provide comprehensive information to individuals and families. Genetic diagnosis not only aids in treatment decisions, such as selecting appropriate anti-seizure medications and avoiding seizure precipitants, but also opens avenues for targeted therapies. The emergence of precision treatments, including gene delivery, gene editing, and antisense oligonucleotides, holds promise for revolutionizing epilepsy management in the future.