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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.
X-chromosome...
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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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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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A Data-Driven Approach to Quantifying Immune States in Sepsis
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Epigenetic changes during sepsis: on your marks!

Aurélien Bataille1,2, Pierre Galichon3,4, Marie-Julia Ziliotis3

  • 1Department of Anesthesia and Intensive Care, Groupe Hospitalier Universitaire Saint-Louis-Lariboisière-Fernand-Widal, 75010, Paris, France. aurelbataille@gmail.com.

Critical Care (London, England)
|October 16, 2015
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Summary
This summary is machine-generated.

Early epigenetic changes, including decreased permissive histone marks, occur in multiple organs within 6 hours of Staphylococcus aureus lung injury in mice. These findings offer insights into sepsis-related multiple organ dysfunction and potential therapeutic targets.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Medical Science

Background:

  • Epigenetics investigates gene regulation influenced by environmental factors.
  • Epigenetics is increasingly relevant in medicine, particularly for drug development.
  • Sepsis-induced multiple organ dysfunction syndrome (MODS) is a critical condition with complex mechanisms.

Purpose of the Study:

  • To investigate early epigenetic alterations in organs following Staphylococcus aureus-induced lung injury.
  • To explore the association between histone modifications and gene expression changes in a mouse model of MODS.
  • To evaluate the potential implications of these findings for the clinical use of epidrugs in sepsis.

Main Methods:

  • Establishment of a mouse model of Staphylococcus aureus lung injury to induce MODS.
  • Analysis of epigenetic modifications, specifically histone marks, in various organs.
  • Quantification of mRNA levels for key genes involved in endothelial function.

Main Results:

  • Major epigenetic changes were detected in multiple organs as early as 6 hours post-injury.
  • A decrease in permissive histone marks correlated with reduced mRNA expression of endothelial function genes.
  • Repressive histone marks remained unchanged, suggesting specific epigenetic pathways are involved.

Conclusions:

  • Early, dynamic epigenetic modifications occur in response to sepsis-induced lung injury.
  • Histone modifications play a role in regulating gene expression relevant to endothelial dysfunction in MODS.
  • Further research is needed to determine the precise role and therapeutic potential of epidrugs in sepsis-related MODS.