Scn2a pathogenic variants and epilepsy: Heterogeneous clinical, genetic and diagnostic features

Roberta Epifanio, Roberto Giorda, Maria Carolina Merlano, Nicoletta Zanotta, Romina Romaniello, Susan Marelli, Silvia Russo, Francesca Cogliati, Maria Teresa Bassi, Claudio Zucca

Research output: Contribution to journalArticlepeer-review

Abstract

Pathogenic variants of the SCN2A gene (MIM 182390) are associated with several epileptic syndromes ranging from benign familial neonatal-infantile seizures (BFNIS) to early infantile epileptic encephalopathy. The aim of this work was to describe clinical features among five patients with concomitant SCN2A gene variants and cryptogenic epileptic syndromes, thus expanding the SCN2A spectrum of phenotypic heterogeneity. De novo variants were identified in four patients, while one inherited variant was identified in a patient with an unaffected carrier biological father with somatic mosaicism. Two of five patients were diagnosed with a neonatal epileptic encephalopathy. The remaining three patients manifested a focal epileptic syndrome associated with autistic spectrum disorders (ASD) or with a variable degree of intellectual disability (ID), one of them displaying a hitherto unreported atypical late onset epilepsy. Overall, the pattern of clinical manifestations among these patients suggest that any observed neurological impairment may not be directly related to the severity of the electroclinical pattern, but instead likely associated with the mutation itself. Moreover, our results highlight the importance of SCN2A mutational screening in cases of ID/ASD with or without epilepsy.

Original languageEnglish
Article number18
JournalBrain Sciences
Volume12
Issue number1
DOIs
Publication statusPublished - Jan 2022

Keywords

  • Autistic spectrum disorder
  • Epilepsy
  • Epileptic encephalopathy
  • Genetics
  • SCN2A gene

ASJC Scopus subject areas

  • Neuroscience(all)

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