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Development of Immunocompetence01:22

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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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Immune activation state modulates infant engram expression across development.

Sarah D Power1,2,3, Erika Stewart1,2, Louisa G Zielke1,2,4

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Infantile amnesia, a common memory loss, is reversible. Maternal immune activation in autism models prevents this forgetting, suggesting developmental immune signals control memory retrieval.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Memory Research

Background:

  • Infantile amnesia is a widespread phenomenon in mammals, representing a significant gap in our understanding of memory development.
  • Investigating the mechanisms underlying infantile amnesia is crucial for understanding memory persistence and loss throughout life.

Purpose of the Study:

  • To explore the mechanisms of infantile amnesia using engram labeling and mouse models.
  • To determine if infantile memories are permanently lost or if they can be retrieved or restored.
  • To investigate the role of maternal immune activation (MIA) in modulating infantile amnesia.

Main Methods:

  • Utilized engram labeling technology in mouse models, including those mimicking autism spectrum disorder (ASD) via MIA.
  • Examined changes in engram ensemble size and dendritic spine plasticity in response to MIA.
  • Employed optogenetic reactivation of dentate gyrus engram cells to attempt memory retrieval.
  • Investigated methods for artificially updating memory engrams to reinstate lost memories.

Main Results:

  • Male offspring exposed to MIA did not exhibit infantile amnesia, unlike typical controls.
  • MIA was found to alter engram ensemble size and dendritic spine plasticity.
  • Optogenetic reactivation successfully rescued apparently forgotten infantile memories in neurotypical mice.
  • Artificial updating of memory engrams permanently reinstated lost infantile memories, proving infantile amnesia is reversible.

Conclusions:

  • Infantile amnesia results from a reversible deficit in engram expression and memory retrieval, not permanent memory loss.
  • Maternal immune activation during development influences innate, reversible forgetting mechanisms.
  • These findings open new avenues for understanding and potentially intervening in memory loss during early development.