De novo truncating variants in the intronless IRF2BPL are responsible for developmental epileptic encephalopathy

F. Tran Mau-Them*, L. Guibaud, L. Duplomb, B. Keren, K. Lindstrom, I. Marey, F. Mochel, M. J. van den Boogaard, R. Oegema, C. Nava, A. Masurel, T. Jouan, F. E. Jansen, M. Au, Agnes H. Chen, M. Cho, Y. Duffourd, E. Lozier, F. Konovalov, A. SharkovS. Korostelev, B. Urteaga, P. Dickson, M. Vera, Julián A. Martínez-Agosto, A. Begemann, M. Zweier, T. Schmitt-Mechelke, A. Rauch, C. Philippe, K. van Gassen, S. Nelson, J. M. Graham, J. Friedman, L. Faivre, H. J. Lin, C. Thauvin-Robinet, A. Vitobello

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review


Purpose: Developmental and epileptic encephalopathies (DEEs) are severe clinical conditions characterized by stagnation or decline of cognitive and behavioral abilities preceded, accompanied or followed by seizures. Because DEEs are clinically and genetically heterogeneous, next-generation sequencing, especially exome sequencing (ES), is becoming a first-tier strategy to identify the molecular etiologies of these disorders. Methods: We combined ES analysis and international data sharing. Results: We identified 11 unrelated individuals with DEE and de novo heterozygous truncating variants in the interferon regulatory factor 2–binding protein-like gene (IRF2BPL). The 11 individuals allowed for delineation of a consistent neurodevelopmental disorder characterized by mostly normal initial psychomotor development followed by severe global neurological regression and epilepsy with nonspecific electroencephalogram (EEG) abnormalities and variable central nervous system (CNS) anomalies. IRF2BPL, also known as enhanced at puberty protein 1 (EAP1), encodes a transcriptional regulator containing a C-terminal RING-finger domain common to E3 ubiquitin ligases. This domain is required for its repressive and transactivating transcriptional properties. The variants identified are expected to encode a protein lacking the C-terminal RING-finger domain. Conclusions: These data support the causative role of truncating IRF2BPL variants in pediatric neurodegeneration and expand the spectrum of transcriptional regulators identified as molecular factors implicated in genetic developmental and epileptic encephalopathies.

Original languageEnglish
Pages (from-to)1008-1014
Number of pages7
JournalGenetics in Medicine
Issue number4
Publication statusPublished - Apr 2019


  • data sharing
  • developmental epileptic encephalopathies
  • exome sequencing


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