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A New GlyT2 Variant Associated with Hyperekplexia.

Jorge Sarmiento-Jiménez1, Raquel Felipe1, Enrique Núñez1

  • 1Departamento de Biología Molecular, Instituto de Biología Molecular (IUBM), Centro de Biología Molecular "Severo Ochoa", Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, 28049 Madrid, Spain.

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|July 29, 2025
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Summary
This summary is machine-generated.

A new GlyT2 gene mutation causes hyperekplexia, a severe neurological disorder in newborns. This loss-of-function variant disrupts glycine transport and cellular protein balance, leading to potentially lethal apnea episodes.

Keywords:
GlyT2 variantUPRglycine transporthyperekplexialipid raftproteome

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Hyperekplexia is a serious neonatal neurological disorder characterized by an exaggerated startle reflex and potentially fatal apnea.
  • The condition stems from impaired glycinergic neurotransmission, crucial for regulating motor control.
  • The glycine transporter GlyT2 (encoded by *SLC6A5*) is vital for maintaining synaptic glycine levels.

Purpose of the Study:

  • To investigate a novel GlyT2 gene variant identified in an infant with hyperekplexia.
  • To elucidate the molecular mechanisms underlying the pathogenicity of this new GlyT2 variant.
  • To understand the impact of the mutation on GlyT2 function, trafficking, and cellular proteostasis.

Main Methods:

  • Genetic sequencing of the *SLC6A5*, *GLRA1*, and *GLRB* genes.
  • Expression of the recombinant GlyT2 variant in heterologous cells.
  • Analysis of transporter activity, membrane insertion, and protein trafficking.
  • Proteomic analysis to assess cellular responses, including the unfolded protein response and lipid raft association.

Main Results:

  • A homozygous missense mutation (G449E) in the *SLC6A5* gene was identified, leading to a non-functional GlyT2 transporter.
  • The mutant GlyT2 exhibited abnormal membrane insertion and premature degradation from the endoplasmic reticulum.
  • Proteomics revealed that the mutant induced the unfolded protein response and disrupted raft-dependent cellular processes, acting as a proteostasis disturber.

Conclusions:

  • The novel G449E GlyT2 variant represents a loss-of-function mutation causing presynaptic hyperekplexia.
  • Beyond loss of transporter activity, the mutant acts as a gain-of-function proteostasis disturber, impacting cellular health.
  • This finding deepens our understanding of hyperekplexia pathogenesis and highlights the complex roles of membrane transporters in cellular function.