No evidence of GABRG2 mutations in severe myoclonic epilepsy of infancy

Francesca Madia, Elena Gennaro, Massimiliano Cecconi, Daniela Buti, Giuseppe Capovilla, Bernardo Dalla Bernardina, Maurizio Elia, Annarita Ferrari, Elena Fontana, Roberto Gaggero, Melania Giannotta, Lucio Giordano, Tiziana Granata, Lorita La Selva, Maria Luisa Lispi, Margherita Santucci, Francesca Vanadia, Pierangelo Veggiotti, Piernanda Vigliano, Maurizio ViriFranca Dagna Bricarelli, Amedeo Bianchi, Federico Zara

Research output: Contribution to journalArticlepeer-review


Severe myoclonic epilepsy of infancy (SMEI) has been long suspected to have a genetic origin. Recently mutations in the gene encoding a voltage-gated α-1 sodium channel subunit - SCN1A - have been identified as a common cause of SMEI. Moreover, a mutation in the gene encoding the γ2 subunit of the GABAA receptor - GABRG2 - has been described in a GEFS+ family with a member affected by SMEI. In order to further investigate the role of GABRG2 in the pathogenesis of SMEI, we have screened for mutations 53 SMEI patients who resulted negative for SCN1A mutations. Mutational screening of GABRG2 genes was performed by denaturing high performance liquid chromatography (DHPLC) and direct sequencing of DNA fragments showing a variant chromatogram. Twenty-nine variant chromatograms were identified corresponding to seven different nucleotide variants. None of them leads to an aminoacid change or obvious protein dysfuntion. No difference in allele frequency was observed for the SMEI patients compared to a control population indicating that these variants are not involved in SMEI. Our study demonstrates that GABRG2 is not a commonly involved in the etiology of SMEI and suggests that other and yet unidentified genes are involved in the syndrome.

Original languageEnglish
Pages (from-to)196-200
Number of pages5
JournalEpilepsy Research
Issue number3
Publication statusPublished - Mar 1 2003


  • Genetics
  • Ion-channels
  • Mutations
  • Severe myoclonic epilepsy of infancy

ASJC Scopus subject areas

  • Clinical Neurology
  • Pediatrics, Perinatology, and Child Health
  • Neurology

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