Loss-of-Function Mutations in FRRS1L Lead to an Epileptic-Dyskinetic Encephalopathy

Am J Hum Genet. 2016 Jun 2;98(6):1249-1255. doi: 10.1016/j.ajhg.2016.04.008. Epub 2016 May 26.

Abstract

Glutamatergic neurotransmission governs excitatory signaling in the mammalian brain, and abnormalities of glutamate signaling have been shown to contribute to both epilepsy and hyperkinetic movement disorders. The etiology of many severe childhood movement disorders and epilepsies remains uncharacterized. We describe a neurological disorder with epilepsy and prominent choreoathetosis caused by biallelic pathogenic variants in FRRS1L, which encodes an AMPA receptor outer-core protein. Loss of FRRS1L function attenuates AMPA-mediated currents, implicating chronic abnormalities of glutamatergic neurotransmission in this monogenic neurological disease of childhood.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, N.I.H., Extramural

MeSH terms

  • Brain Diseases / genetics*
  • Electrophysiology
  • Epilepsy / genetics*
  • Female
  • Humans
  • Hyperkinesis / genetics*
  • Infant
  • Male
  • Membrane Proteins / genetics*
  • Mutation / genetics*
  • Nerve Tissue Proteins / genetics*
  • Pedigree
  • Synaptic Transmission / physiology*
  • alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid / metabolism

Substances

  • FRRS1L protein, human
  • Membrane Proteins
  • Nerve Tissue Proteins
  • alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid