SZT2 mutation in a boy with intellectual disability, seizures and autistic features

Eur J Med Genet. 2019 Sep;62(9):103556. doi: 10.1016/j.ejmg.2018.10.008. Epub 2018 Oct 22.

Abstract

The seizure threshold 2 (SZT2) gene has been shown to confer a low seizure threshold and may enhance epileptogenesis in mice. However, its biological function is still not known. Mutations in SZT2 have been reported in very few patients and features range from mild to moderate intellectual disability without seizures to severe intellectual disability with epileptic encephalopathies with severe developmental delay. Here, we report a six-year-old boy with a novel homozygous mutation in SZT2 gene with intellectual disability, seizures, absent speech and autistic features. We are reporting the first patient with autistic features including very little or no eye contact, arm flapping and repetitive behaviour.

Keywords: Autism; Epileptic encephalopathies; Intellectual disability; SZT; Seizure.

Publication types

  • Case Reports

MeSH terms

  • Autistic Disorder / genetics*
  • Autistic Disorder / pathology
  • Child
  • Homozygote
  • Humans
  • Intellectual Disability / genetics*
  • Intellectual Disability / pathology
  • Male
  • Mutation
  • Nerve Tissue Proteins / genetics*
  • Seizures / genetics*
  • Seizures / pathology

Substances

  • Nerve Tissue Proteins
  • SZT2 protein, human