PCDH19-related epilepsy: a rare but recognisable clinical syndrome in females.
Lyons S., Marnane M., Reavey E., Williams N., Costello D.
Protocadherin 19 (PCDH19)-related epilepsy (OMIM 300088) is a distinctive clinical syndrome limited to females. We describe a 17-year-old girl who presented to a regional epilepsy clinic with a history of recurrent febrile seizures in infancy. Genetic analysis of thePCDH19gene revealed a novel heterozygous mutation within a highly conserved region of the gene. Patients withPCDH19mutations present with clusters of seizures associated with fever. While fever-induced seizures are common to children withPCDH19andSCN1Amutations, there are certain clinical features that distinguish these genetic syndromes from each other.PCDH19mutation demonstrates an unusual form of transmission such that only heterozygous females develop the phenotype. De novo mutations account for most cases although the inheritance is sometimes familial patterns of inheritance. Hemizygous males are typically unaffected. Identification of the mutation provides patients and their families with an explanation for their clinical presentation, important prognostic information and an opportunity for genetic counselling.