Febrile seizures are the most common form of childhood seizures, occurring in 2% to 5% of North American children. We report a large Utah family with 21 members affected by febrile seizures inherited as an autosomal dominant trait. All had generalized tonic–clonic seizures with onset associated with fever, consistent with the consensus febrile seizure phenotype, and none had febrile seizures beyond 6 years of age. Eighteen affected individuals had recurrent febrile seizures. Eight individuals developed afebrile seizures between ages 5 and 13 years. Afebrile seizures consisted of generalized tonic–clonic, generalized tonic, generalized atonic, simple partial, and partial complex seizure types and were associated with abnormal electroencephalographic findings in 5 individuals, all of whom were intellectually normal. We undertook linkage analysis in this family, defining the disease phenotype as febrile seizures alone. Linkage analysis in epilepsy candidate gene/loci regions failed to show evidence for linkage to febrile seizures. However, a genomewide scan and subsequent fine mapping revealed significant evidence for a new febrile seizure locus (FEB3) on chromosome 2q23‐24 with linkage to the marker D2S2330 (LOD score 8.08 at θ = 0.001). Haplotype analysis defined a critical 10‐cM region between markers D2S141 and D2S2345 that contains the FEB3 locus.
Annals of Neurology – Wiley
Published: Oct 1, 1999
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