The concordance rate would be the same for identical twins and non-identical twins. This shows that epilepsy has a strong genetic component. These numbers are the average for all types of epilepsy. The various sub-types of epilepsy have different numbers. Although the table below is long, the listed genes are responsible for only a fraction of all epilepsy cases.
More genes remain to be discovered.
This was the first epilepsy gene identified. Variants of this gene cause a type of progressive epilepsy that is uncommon everywhere except Finland. This gene is the blueprint for a protein whose function is unknown. When a single copy of certain variants of this gene is inherited, seizures can occur. Unlike most epilepsy, however, the seizures occur only in the newborn period.