A novel GABRB3 variant in Dravet syndrome: Case report and literature review

Maria Piccione, Giovanni Corsello, Martino Ruggieri, Enrico Parano, Xena Giada Pappalardo, Piero Pavone, Laura Sciuto, Simona D. Marino, Raffaele Falsaperla

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Abstract

Background: Mutations in GABRB3 have been identified in subjects with different types of epilepsy and epileptic syndromes, including West syndrome (WS), Dravet syndrome (DS), Lennox-Gastaut syndrome (LGS), myoclonic-atonic epilepsy (MAE), and others. Methods and results: We herewith report on a girl affected by DS, who has been followed from infancy to the current age of 18 years. Next-generation sequencing (NGS)-based genetic testing for multigene analysis of neurodevelopmental disorders identified two likely de novo pathogenic mutations, a missense variant in GABRB3 gene (c.842 C>T; p.Thr281IIe) and a nonsense variant found in BBS4 gene (c.883 C>T; p.Arg295Ter). Conclusion: A likely relationship between the novel GABRB3 gene variant and the clinical manifestations presented by the girl is proposed. Previously, one case of DS and two of DS-like linked with GABRB3 mutations have been reported. To the best of our knowledge, this is the first report of DS associated with this novel variant. A literature review of clinical cases with various types of epileptic encephalopathies (EEs) related to GABRB3 mutations is reported.
Original languageEnglish
Number of pages6
JournalMOLECULAR GENETICS & GENOMIC MEDICINE
Volume8
Publication statusPublished - 2020

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Genetics
  • Genetics(clinical)

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