Early onset epileptic encephalopathy or genetically determined encephalopathy with early onset epilepsy? Lessons learned from TSC

Paolo Curatolo, Eleonora Aronica, Anna Jansen, Floor Jansen, Katarzyna Kotulska, Lieven Lagae, Romina Moavero, Sergiusz Jozwiak

Research output: Contribution to journalArticle

Abstract

Background In tuberous sclerosis complex (TSC) a relationship has been shown between early and refractory seizures and intellectual disability. However, it is uncertain whether epilepsy in TSC is simply a marker in infants who are destined to develop an encephalopathic process or if seizures play a causal role in developing an encephalopathy. Methods This paper summarizes the key points discussed during a European TSC workshop held in Rome, and reviews the experimental and clinical evidence in support of the two theories. Results/Conclusion There are many factors that influence the appearance of both early seizure onset and the encephalopathy resulting in neurodevelopmental deficits. Experimental studies show that as a consequence of the TSC genes mutation, mammalian target of Rapamycin (mTOR) overactivation determines an alteration in cellular morphology with cytomegalic neurons, altered synaptogenesis and an imbalance between excitation/inhibition, thus providing a likely neuroanatomical substrate for the early appearance of refractory seizures and for the encephalopathic process. At the clinical level, early signs of altered developmental trajectories are often unrecognized before 12 months of age. Evidence from experimental research shows that encephalopathy in TSC might have a genetic cause, and mTOR activation caused by TSC gene mutation can be directly responsible for the early appearance of seizures and encephalopathy.

Original languageEnglish
Pages (from-to)203-211
Number of pages9
JournalEuropean Journal of Paediatric Neurology
Volume20
Issue number2
DOIs
Publication statusPublished - Mar 1 2016

Keywords

  • Epileptic encephalopathy
  • Genetics
  • mTOR
  • Tuberous sclerosis
  • Vigabatrin

ASJC Scopus subject areas

  • Clinical Neurology
  • Pediatrics, Perinatology, and Child Health

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