CHD2-epilepsy: Polygraphic documentation of self-induced seizures due to fixation-off sensitivity

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CHD2 gene has been described in association with different types of childhood myoclonic epilepsy and is emerging as a gene involved in photosensitivity alone or combined with epilepsy. Recent studies suggest that CHD2 could be responsible for a proper phenotype characterized by infantile-onset generalized epilepsy, intellectual disability, and photosensitivity and in particular with self-induced seizures. We report the case of a child with CHD2 mutation and mild developmental impairment that since the age of 3 years started with myoclonic seizures apparently well responding to antiepileptic drugs and that subsequently developed intractable self-induced seizures. Through an accurate Video-EEG polygraphic analysis, we demonstrated that seizures are related to an abnormal increase of epileptiform activity after eye-closure or loss of fixation as observed in the Fixation-Off Sensitivity (FOS) phenomenon. In conclusion our study adds relevant features of the CHD2-epilepsy phenotype and confirms that CHD2 mutations produce a distinctive form of myoclonic epilepsy with visual-sensitive seizures.

Original languageEnglish
Pages (from-to)8-10
Number of pages3
Publication statusPublished - Apr 2018


  • Brain/physiopathology
  • Child
  • DNA-Binding Proteins/genetics
  • Electroencephalography
  • Fixation, Ocular
  • Humans
  • Male
  • Mutation
  • Myoclonic Epilepsy, Juvenile/diagnosis
  • Phenotype
  • Seizures/diagnosis
  • Visual Perception


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