De novo GRIN1 mutations: An emerging cause of severe early infantile encephalopathy

Yoav Zehavi, Hanna Mandel, Arie Zehavi, Muhammad Abu Rashid, Rachel Straussberg, Banan Jabur, Avraham Shaag, Orly Elpeleg, Ronen Spiegel

Research output: Contribution to journalArticlepeer-review

Abstract

De novo GRIN1 mutations have recently been shown to cause severe intellectual disability, hypotonia, hyperkinetic and stereotyped movements, and epilepsy. We report two new cases of severe early onset encephalopathy associated with hyperkinetic and oculogyric-like movements, caused by mutations in the GRIN1 gene; both were identified by whole exome sequencing. One of the patients harbored the novel mutation p.Ser688Tyr and the other patient harbored the p.Gly827Arg mutation, which was previously reported in three patients. In silico studies suggested that the p.Se688Tyr mutation results in disruption of NMDA ligand binding and the p.Gly827Arg mutation results in disrupted gating of the ion channel. Our study highlights the importance of GRIN1 mutations in the etiology of isolated cases of early onset encephalopathy, and the valuable role of whole exome sequencing in identifying these mutations.

Original languageEnglish
Pages (from-to)317-320
Number of pages4
JournalEuropean Journal of Medical Genetics
Volume60
Issue number6
DOIs
StatePublished - 1 Jun 2017
Externally publishedYes

Keywords

  • De novo mutation
  • Early onset encephalopathy
  • GRIN1
  • Oculogyric movements

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