Extending the phenotypic spectrum of RBFOX1 deletions: Sporadic focal epilepsy

Dennis Lal, Katharina Pernhorst, Karl Martin Klein, Philipp Reif, Rossana Tozzi, Mohammad R. Toliat, Georg Winterer, Bernd Neubauer, Peter Nürnberg, Felix Rosenow, Felicitas Becker, Holger Lerche, Wolfram S. Kunz, Mitja I. Kurki, Per Hoffmann, Albert J. Becker, Emilio Perucca, Federico Zara, Thomas Sander, Yvonne G. Weber

Research output: Contribution to journalArticle

Abstract

Summary Partial deletions of the RBFOX1 gene encoding the neuronal splicing regulator have been reported in a range of neurodevelopmental diseases including idiopathic/genetic generalized epilepsy (IGE/GGE), childhood focal epilepsy, and self-limited childhood benign epilepsy with centrotemporal spikes (BECTS, rolandic epilepsy), and autism. The protein regulates alternative splicing of many neuronal transcripts involved in the homeostatic control of neuronal excitability. Herein, we examined whether structural deletions affecting RBFOX1 exons confer susceptibility to common forms of juvenile and adult focal epilepsy syndromes. We screened 807 unrelated patients with sporadic focal epilepsy, and we identified seven hemizygous exonic RBFOX1 deletions in patients with sporadic focal epilepsy (0.9%) in comparison to one deletion found in 1,502 controls. The phenotypes of the patients carrying RBFOX1 deletions comprise magnetic resonance imaging (MRI)-negative epilepsy of unknown etiology with frontal and temporal origin (n = 5) and two patients with temporal lobe epilepsy with hippocampal sclerosis. The epilepsies were largely pharmacoresistant but not associated with intellectual disability. Our study extends the phenotypic spectrum of RBFOX1 deletions as a risk factor for focal epilepsy and suggests that exonic RBFOX1 deletions are involved in the broad spectrum of focal and generalized epilepsies.

Original languageEnglish
Pages (from-to)e129-e133
JournalEpilepsia
Volume56
Issue number9
DOIs
Publication statusPublished - Sep 1 2015

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Keywords

  • Copy number variation
  • Cryptogenic
  • Genetic
  • Idiopathic
  • Lesional
  • Magnet resonance imaging negative

ASJC Scopus subject areas

  • Clinical Neurology
  • Neurology

Cite this

Lal, D., Pernhorst, K., Klein, K. M., Reif, P., Tozzi, R., Toliat, M. R., Winterer, G., Neubauer, B., Nürnberg, P., Rosenow, F., Becker, F., Lerche, H., Kunz, W. S., Kurki, M. I., Hoffmann, P., Becker, A. J., Perucca, E., Zara, F., Sander, T., & Weber, Y. G. (2015). Extending the phenotypic spectrum of RBFOX1 deletions: Sporadic focal epilepsy. Epilepsia, 56(9), e129-e133. https://doi.org/10.1111/epi.13076