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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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Temporal changes in the gene expression heterogeneity during brain development and aging.

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As people age, the human brain shows increased gene expression variability. This age-related brain heterogeneity impacts neuronal function and lifespan regulation.

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Area of Science:

  • Neuroscience
  • Genetics
  • Aging Research

Background:

  • Non-mitotic tissues like the brain accumulate stochastic epigenetic alterations.
  • Inter-individual gene expression heterogeneity increases with age, but its developmental timing and functional impact are unclear.

Purpose of the Study:

  • To investigate the developmental trajectory of inter-individual gene expression heterogeneity in the human brain.
  • To determine the functional significance of aging-related brain heterogeneity.

Main Methods:

  • Meta-analysis of 19 transcriptome datasets from three independent studies.
  • Analysis covered diverse human brain regions and age groups (postnatal development vs. aging).

Main Results:

  • A significant increase in inter-individual gene expression heterogeneity was observed in the aging brain (over 20 years) compared to postnatal development (0-20 years).
  • This increased heterogeneity was consistent across brain regions and associated with lifespan regulation and neuronal functions.

Conclusions:

  • Increased gene expression heterogeneity is a hallmark of the aging human brain.
  • This heterogeneity may play a role in age-related changes in brain function.