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Related Concept Videos

Epigenetic Regulation01:37

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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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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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Exercise: putting action into our epigenome.

Joshua Denham1, Francine Z Marques, Brendan J O'Brien

  • 1School of Health Sciences, Federation University Australia, Room 228, Y Building, University Drive, Mt Helen, Ballarat, VIC, 3350, Australia.

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Regular exercise impacts gene expression through epigenetic modifications like DNA methylation and microRNAs (miRNAs). These changes influence health, longevity, and athletic performance, revealing the field of exercise epigenomics.

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Area of Science:

  • Exercise science
  • Genetics
  • Epigenetics

Background:

  • Human phenotypes result from genomic and environmental interactions.
  • Regular physical exercise offers significant health benefits, including disease prevention and increased longevity.
  • The underlying molecular mechanisms, particularly gene expression changes, are not fully understood.

Purpose of the Study:

  • To review the effects of exercise on epigenetic modifications.
  • To explore how these modifications influence gene expression and biological responses.
  • To highlight the role of epigenetics in exercise-induced health benefits and performance.

Main Methods:

  • Review of current research on exercise and epigenetics.
  • Analysis of studies on DNA methylation, histone acetylation, and microRNAs (miRNAs) in response to exercise.
  • Examination of data from various tissues including muscle, adipose tissue, and blood cells.

Main Results:

  • Epigenetic modifications (DNA methylation, histone acetylation) and miRNAs respond to acute aerobic and resistance exercise.
  • Six months of aerobic exercise alters whole-genome DNA methylation in skeletal muscle and adipose tissue, impacting lipogenesis.
  • miRNA expression profiles correlate with maximal oxygen consumption (VO2max) and trainability, and differentiate exercise response.

Conclusions:

  • Exercise epigenomics is a rapidly advancing field with significant implications for health and performance.
  • Epigenetic modifications and miRNAs are key mediators of exercise's beneficial effects.
  • Further research will clarify the clinical relevance of exercise-induced epigenetic changes and their role in conferring a healthier phenotype.