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Forgetting is a complex cognitive phenomenon influenced by several factors, among which interference and decay are particularly prominent. These processes explain why individuals often struggle to retrieve specific information from memory, leading to lapses in recall that can be observed in everyday situations.
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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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'Memory and molecular turnover,' 30 years after inception.

Richard B Meagher1

  • 1Genetics Department, University of Georgia, Athens, GA 30602 USA.

Epigenetics & Chromatin
|December 20, 2014
PubMed
Summary

Sir Francis Crick

Area of Science:

  • Neuroscience
  • Epigenetics
  • Molecular Biology

Background:

  • Sir Francis Crick hypothesized memory is stored via reversible DNA/protein modifications.
  • Crick's 1984 model proposed enzymatic mechanisms to maintain modifications on symmetrical molecules.
  • Long-term memory storage presents a paradox with rapid biomolecular turnover rates.

Purpose of the Study:

  • To explore Crick's model in the context of modern epigenetics and molecular turnover.
  • To approximate molecular turnover rates for chromatin modifications involved in memory.
  • To elucidate Crick's paradox concerning rapid molecular turnover and long-term memory.

Main Methods:

  • Approximation of molecular turnover rates for DNA cytosine methylation and histone modifications.
Keywords:
AcetylationHistonesHydroxymethylcytosineMethylcytosineNucleosomesPost-translational modification

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  • Utilized diverse experimental approaches to measure half-lives of specific chromatin modifications.
  • Analysis of enzymatic mechanisms and molecular symmetry in maintaining site-specific turnover.

    • Main Results:

    • Short molecular turnover rates were observed for DNA cytosine methylation (hours) and histone modifications (minutes).
    • These rapid turnover rates are found at specific chromatin sites regulating gene expression.
    • Turnover in the brain, particularly in neurons, may be even faster, supporting plasticity and memory.

    Conclusions:

    • Rapid turnover of epigenetic marks like DNA methylation and histone modifications challenges traditional views of memory storage.
    • The complex machinery for this rapid turnover, involving molecular symmetry, is crucial but its role in memory is unclear.
    • Resolving Crick's paradox is fundamental to understanding cognitive function and neurodegenerative diseases.