Mutations of PTPN23 in developmental and epileptic encephalopathy

Nadine Sowada, Mais Omar Hashem, Rüstem Yilmaz, Muddathir Hamad, Naseebullah Kakar, Holger Thiele, Stefan T. Arold, Harald Bode, Fowzan S. Alkuraya, Guntram Borck

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Developmental and epileptic encephalopathies (DEE) are a heterogeneous group of neurodevelopmental disorders with poor prognosis. Recent discoveries have greatly expanded the repertoire of genes that are mutated in epileptic encephalopathies and DEE, often in a de novo fashion, but in many patients, the disease remains molecularly uncharacterized. Here, we describe a new form of DEE in patients with likely deleterious biallelic variants in PTPN23. The phenotype is characterized by early onset drug-resistant epilepsy, severe and global developmental delay, microcephaly, and sometimes premature death. PTPN23 encodes a tyrosine phosphatase with strong brain expression, and its knockout in mouse is embryonically lethal. Structural modeling supports a deleterious effect of the identified alleles. Our data suggest that PTPN23 mutations cause a rare severe form of autosomal-recessive DEE in humans, a finding that requires confirmation.
Original languageEnglish (US)
Pages (from-to)1455-1461
Number of pages7
JournalHuman Genetics
Volume136
Issue number11-12
DOIs
StatePublished - Oct 31 2017

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