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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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Aging-related histone modification changes in brain function.

Yanwen Ding1,2,3, Chengxi Liu2, Yi Zhang1,2,3

  • 1Department of Anesthesiology The Second Affiliated Hospital of Zunyi Medical University Zunyi Guizhou China.

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Summary
This summary is machine-generated.

Brain aging involves epigenetic changes, specifically histone modifications like methylation and acetylation. These alterations impact gene expression, downregulating synaptic and mitochondrial genes while upregulating immune and inflammatory genes.

Keywords:
acetylationagingcognitive dysfunctionmethylationneurodegeneration

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Area of Science:

  • Neuroscience
  • Epigenetics
  • Aging Research

Background:

  • Aging is a progressive decline in physiological functions and integrity across tissues, organs, and cells.
  • Brain aging is characterized by neuronal apoptosis, altered synaptic structure, neurotransmission, and metabolism, impairing cognitive and sensory functions.
  • Histone modifications represent key epigenetic changes during aging, influencing brain functions like synaptic and mitochondrial activity, and immune responses.

Purpose of the Study:

  • To review age-related changes in histone modifications within the brain.
  • To examine the impact of specific histone modifications (methylation and acetylation) on gene transcription and protein expression during brain aging.
  • To identify shifts in gene expression patterns associated with aging, particularly concerning synaptic, mitochondrial, immune, and inflammatory functions.

Main Methods:

  • Review of scientific literature on histone modifications and brain aging.
  • Analysis of changes in gene transcription and protein expression linked to histone modifications.
  • Focus on specific epigenetic mechanisms including histone methylation and acetylation.

Main Results:

  • Significant alterations in histone modifications are observed during brain aging.
  • Genes crucial for synaptic and mitochondrial functions are downregulated in the aging brain.
  • Genes involved in immune response and inflammatory processes are upregulated with age in the brain.

Conclusions:

  • Histone modifications play a critical role in the epigenetic landscape of the aging brain.
  • Age-related epigenetic changes lead to a functional decline in synaptic and mitochondrial pathways.
  • Increased immune and inflammatory gene expression contributes to the aging brain's altered functional state.