Hereditary febrile seizures: Phenotype and evidence for a chromosome 19p locus

Steven L. Kugler, E. Scot Stenroos, David E. Mandelbaum, Thomas Lehner, Vershon V. McKoy, Trisha Prossick, Jennifer Sasvari, Krystine Swannick, Jordan Katz, William G. Johnson

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The occurrence of febrile seizures (FSs) in large autosomal dominant FS kindreds makes possible accurate delineation of the pure clinical phenotype of hereditary FS among secondary FS cases, and the identification of gene loci causing susceptibility to FS. Recently FS gene loci on chromosomes 8 and 19 were identified. We studied the phenotype of FS in four large families in which FS is an autosomal dominant trait. Among 30 affected secondary FS cases, mean age of onset was 16.3 months (range 4 to 36 months), sex ratio was equal, and 43% were complex (13 of 30). Among these 30 secondary FS cases, the mean number of FSs was 2.1, half had only a single FS, and none had afebrile seizures. Penetrance was 0.67, approximately the same as in our previous larger group of 40 multicase FS families (0.64). The occurrence of DPT encephalopathy in a sib of a patient with FS raises the possibility that these two etiologies are related. Linkage studies showed that one of the four families (Family 1) was linked to chromosome 19p markers, none of the families was linked to chromosome 8q markers, and the largest FS family (Kindred 6) was unlinked to either 19p or 8q markers, supporting the hypothesis of genetic heterogeneity for FS.

Original languageEnglish (US)
Pages (from-to)354-361
Number of pages8
JournalAmerican journal of medical genetics
Issue number5
StatePublished - Oct 12 1998

All Science Journal Classification (ASJC) codes

  • Genetics
  • Genetics(clinical)


  • DPT encephalopathy
  • Epilepsy
  • Febrile convulsions
  • Febrile seizures
  • Human chromosome 19
  • Human chromosome 8
  • Linkage mapping
  • Phenotype


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