CDKL5 mutations as a cause of severe epilepsy in infancy: clinical and electroencephalographic long-term course in 4

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Johanna Jähn1, Almuth Caliebe, Sarah von Spiczak

  • 1Department of Neuropediatrics, University Medical Center Schleswig-Holstein (UKSH), Kiel, Germany. j.albers@pedneuro.uni-kiel.de

Journal of Child Neurology
|July 27, 2012
PubMed

Insights

Cyclin-dependent kinase-like 5 (CDKL5) mutations lead to severe infantile epilepsy and epileptic encephalopathy. Long-term observations reveal evolving seizure types and refractory epilepsy, with late hypsarrhythmia potentially indicating severe outcomes.

Area of Science:

  • Neurology
  • Genetics
  • Epileptology

Background:

  • Cyclin-dependent kinase-like 5 (CDKL5) mutations are a known cause of severe early-onset epilepsy and epileptic encephalopathy.
  • Limited long-term observational data exists for patients with CDKL5-related epileptic encephalopathy, hindering understanding of disease progression.

Purpose of the Study:

  • To describe the long-term evolution of epilepsy phenotype and electroencephalographic (EEG) features in patients with CDKL5 mutations.
  • To identify potential clinical or EEG markers associated with severe outcomes in CDKL5-related epileptic encephalopathy.

Main Methods:

  • Longitudinal observational study of 4 patients with CDKL5 mutations.
  • Detailed recording of seizure types, onset, and evolution over time (up to 22 years).
  • Analysis of electroencephalographic (EEG) patterns throughout the observation period.

Main Results:

  • Epilepsy commenced with focal seizures within the first 3 months of life in all 4 patients.
  • Seizure types evolved to epileptic spasms (ages 2-6 years) and later to tonic seizures.
  • Epilepsy was refractory to antiepileptic therapy in 3 out of 4 patients.
  • Late hypsarrhythmia (persisting until age 9) was observed in 2 patients, without a universal EEG pattern across all patients.

Conclusions:

  • CDKL5-related epileptic encephalopathies represent severe, refractory seizure disorders originating in early infancy.
  • The occurrence of late hypsarrhythmia may signify a subgroup of patients with a more severe prognosis and adverse outcomes.
  • Further research into late hypsarrhythmia could aid in stratifying risk and guiding management in CDKL5-related disorders.

Keywords:
CDKL5West syndromeelectroencephalogramsepileptic encephalopathylate hypsarrhythmia

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