Familial Ohtahara syndrome due to a novel ARX gene mutation

L. Giordano, S. Sartori, S. Russo, P. Accorsi, J. Galli, A. Tiberti, E. Bettella, M. Marchi, A. Vignoli, F. Darra, A. Murgia, B. Dalla Bernardina

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Recently, it has been reported that longer expansions of the polyalanine tract of the ARX gene could cause an early infantile encephalopathy with suppression burst pattern and that the length of this repeat region could be related to the severity of the electroclinical picture. We describe the history of two male individuals, born from monozygotic twin sisters, with Ohtahara syndrome (OS) that evolved into West syndrome phenotype and epileptic encephalopathy. In both children, we have found a previously unreported missense mutation in exon 5 of ARX gene (c.1604T>A) resulting in the substitution of a leucine with a glutamine in the aminoacid sequence. The two mothers and the maternal grandmother carry the same mutation which segregates with the disease phenotype in the family. This study confirms that ARX is involved in the pathogenesis of cryptogenic early onset epileptic encephalopathy, such as OS, and suggests that the severity of the electroclinical picture is likely to not exclusively correlate with the extent of expansions of the polyalanine tracts, but rather with the functional effect of different pathogenetic mutations.

Original languageEnglish
Pages (from-to)3133-3137
Number of pages5
JournalAmerican Journal of Medical Genetics, Part A
Volume152 A
Issue number12
Publication statusPublished - Dec 2010


  • ARX gene
  • EEG
  • Gene expression studies
  • Infantile spasms
  • Neonatal seizure

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics


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