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The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
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Neurotransmitters are integral to the brain's communication system, enabling neurons to transmit signals across synapses. This chemical exchange underpins various cognitive functions, including memory processes. The role of neurotransmitters in memory is multifaceted, influencing the encoding, consolidation, and retrieval of memories through their action on different neural circuits.
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Long-term memory is a relatively permanent type of memory, capable of storing vast amounts of information over extended periods. Its storage capacity is generally considered unlimited.
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Related Experiment Video

Updated: Jun 29, 2025

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The Intellectual Disability Risk Gene Kdm5b Regulates Long-Term Memory Consolidation in the Hippocampus.

Leticia Pérez-Sisqués1,2, Shail U Bhatt1, Rugile Matuleviciute2

  • 1Centre for Craniofacial and Regenerative Biology, Guy's Hospital, King's College London, London SE1 9RT, United Kingdom.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|April 4, 2024
PubMed
Summary

The histone lysine demethylase KDM5B is crucial for hippocampus-dependent learning and memory. Loss of KDM5B function in mice leads to memory deficits, suggesting its role in cognitive function.

Keywords:
KDM5Bchromatinhippocampushistone lysine demethylaselearningmemorymouse

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • The KDM5 family of lysine demethylases plays vital roles in brain development and homeostasis.
  • KDM5B variants are linked to intellectual disability and reduced cognitive function.
  • Some KDM5B functions may not depend on its demethylase activity.

Purpose of the Study:

  • To investigate the role of KDM5B in hippocampus-dependent learning and memory.
  • To understand the impact of KDM5B dysfunction on cognitive processes.

Main Methods:

  • Studied mice homozygous for a demethylase-inactive KDM5B allele (Kdm5bΔARID/ΔARID).
  • Analyzed gene expression of immediate early and learning-associated genes in the hippocampus.
  • Knocked down KDM5B in the adult wild-type mouse hippocampus using shRNA.

Main Results:

  • Kdm5bΔARID/ΔARID mice showed hyperactivity and long-term memory deficits.
  • Gene expression of activity-dependent genes was altered in Kdm5bΔARID/ΔARID mice.
  • Hippocampal KDM5B knockdown in adult mice caused seizures, hyperactivity, and impaired long-term memory and potentiation.

Conclusions:

  • KDM5B is essential for regulating gene expression and synaptic plasticity in the adult hippocampus.
  • Cognitive deficits associated with KDM5B variants may stem from direct effects on memory consolidation.
  • KDM5B is a critical regulator of learning and memory mechanisms.