Genetic literacy series: genetic epilepsy with febrile seizures plus.

Genetic epilepsy with febrile seizures plus (GEFS+) is a familial epilepsy syndrome in which affected individuals within a family typically have a variety of epilepsy phenotypes, varying from simple febrile seizures and febrile seizures plus with a good outcome to severe epileptic encephalopathies. Here, we review the spectrum of epilepsy phenotypes, the genetic architecture of GEFS+, and the implicated genes. Using an illustrative clinical case study, we describe important steps in managing patients with GEFS+: making the diagnosis of GEFS+, appropriate genetic testing, and counselling.