Genetics of the partial epilepsies: a review.

The research literature is consistent in reporting somewhat less familial aggregation in partial than in generalized epilepsy. However, relatives of patients with partial seizures do appear to have higher seizure risks than relatives of controls, suggesting that genetic factors are important in at least some partial epilepsies. Complex partial epilepsy appears to be only slightly less familial than other types of epilepsy. Relatives of patients with focal EEG abnormalities generally have been found to have lower risk of both EEG abnormalities and epilepsy than relatives of patients with generalized abnormalities. For focal temporocentral abnormalities, however, there is evidence of an important influence of genetic factors.