Orphanet: Benign familial neonatal infantile seizures

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Benign familial neonatal-infantile seizures

Disease definition

Benign familial neonatal-infantile seizures (BFNIS) is a benign familial epilepsy syndrome with an intermediate phenotype between benign familial neonatal seizures (BFNS) and benign familial infantile seizures (BFIS; see these terms). So far, this syndrome has been described in multiple members of 10 families. Age of onset in these BFNIS families varied from 2 days to 6 months, with spontaneous resolution in most cases before the age of 12 months. Like BFNS and BFIS, seizures in BFNIS generally occur in clusters over one or a few days with posterior focal seizure onset. BFNIS is caused by mutations in the SCN2A gene (2q24.3), encoding the voltage-gated sodium channel alpha-subunit Na(V)1.2. Transmission is autosomal dominant.


Classification level: Disorder
  • Synonym(s):
    • BFNIS
    • Benign neonatal-infantile epilepsy
  • Prevalence: <1 / 1 000 000
  • Inheritance: Autosomal dominant 
  • Age of onset: Infancy, Neonatal
  • ICD-10: G40.4
  • OMIM: 607745
  • UMLS: C0220669
  • MeSH: -
  • GARD: 1518
  • MedDRA: 10067866
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