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Related Experiment Video

Updated: Feb 13, 2026

Microtransplantation of Synaptic Membranes to Reactivate Human Synaptic Receptors for Functional Studies
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Cereblon Maintains Synaptic and Cognitive Function by Regulating BK Channel.

Tae-Yong Choi1,2, Seung-Hyun Lee1, Yoon-Jung Kim1

  • 1Department of Physiology and Dental Research Institute, Seoul National University School of Dentistry, Seoul 03080, Republic of Korea.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 14, 2018
PubMed
Summary

Mutations in the cereblon (CRBN) gene cause intellectual disability. CRBN gene mutations impair synaptic transmission by increasing BK channel activity, leading to cognitive deficits. This suggests a new therapeutic target for CRBN-related intellectual disability.

Keywords:
BK channelsCRBNintellectual disabilityneurotransmitter releasepresynaptic

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Mutations in the cereblon (CRBN) gene are a known cause of human intellectual disability.
  • The precise molecular mechanisms underlying CRBN-related intellectual disability are not well understood.
  • Synaptic dysfunction is a common factor in cognitive disorders.

Purpose of the Study:

  • To investigate the role of CRBN in synaptic function and animal behavior.
  • To elucidate the molecular mechanisms of CRBN-related intellectual disability.

Main Methods:

  • Utilized male mouse and Drosophila models with CRBN knock-out (KO) and pathogenic CRBN mutants.
  • Assessed brain and spine morphology, synaptic plasticity, synaptic transmission, and presynaptic release probability.
  • Examined the effects of BK channel blockers (paxilline, iberiotoxin) on synaptic function and cognitive behavior.

Main Results:

  • CRBN KO mice exhibited normal brain and spine morphology but reduced synaptic transmission and presynaptic release probability in excitatory synapses.
  • Pathogenic CRBN mutants also impaired presynaptic function.
  • BK channel blockers reversed the reduced presynaptic release probability in CRBN KO mice.
  • Paxilline treatment restored normal cognitive behavior in CRBN KO mice.

Conclusions:

  • Increased BK channel activity is identified as a key pathological mechanism in CRBN-related intellectual disability.
  • CRBN deficiency leads to cognitive deficits through enhanced BK channel activity and reduced presynaptic glutamate release.
  • These findings offer insights into the pathomechanism of CRBN-related intellectual disability and suggest potential therapeutic strategies targeting BK channels.