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Chromatin plasticity predetermines neuronal eligibility for memory trace formation.

Giulia Santoni1, Simone Astori2, Marion Leleu3

  • 1Laboratory of Neuroepigenetics, Brain Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.

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The epigenetic state of neurons, specifically chromatin plasticity, determines their ability to form memories. Enhancing this plasticity recruits more neurons for memory encoding, proving crucial for memory formation.

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Area of Science:

  • Neuroscience
  • Epigenetics
  • Molecular Biology

Background:

  • Memory encoding involves specific neuronal populations.
  • The mechanisms governing neuronal recruitment into memory traces are not fully understood.
  • Epigenetic modifications play a role in cellular function and plasticity.

Purpose of the Study:

  • To investigate the role of epigenetic state in neuronal recruitment for memory encoding.
  • To explore the link between chromatin plasticity and memory trace formation.
  • To determine if epigenetic modifications are cell-autonomous in memory encoding.

Main Methods:

  • Examined epigenetic state (chromatin plasticity) in mouse lateral amygdala principal neurons.
  • Experimentally manipulated chromatin plasticity.
  • Measured neuronal excitability in real-time.
  • Used optogenetics to silence epigenetically altered neurons.

Main Results:

  • Neuronal eligibility for memory encoding depends on pre-existing epigenetic state.
  • Elevated chromatin plasticity enhanced neuronal recruitment into memory ensembles.
  • Chromatin plasticity occurred at synaptic plasticity-related genomic regions.
  • Increased neuronal excitability was observed in real-time.
  • Silencing epigenetically altered neurons impaired memory expression.

Conclusions:

  • Epigenetic state, particularly chromatin plasticity, is a key determinant of neuronal recruitment for memory encoding.
  • Chromatin plasticity in neurons is cell-autonomous and directly impacts memory trace formation.
  • These findings reveal a novel mechanism linking epigenetics to memory formation.