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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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DNA phosphorothioate modification-a new multi-functional epigenetic system in bacteria.

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Summary

Naturally occurring phosphorothioate (PT) modifications in bacteria, catalyzed by dndABCDE genes, offer nuclease resistance and resemble DNA restriction-modification systems. These modifications play roles in redox homeostasis and environmental adaptation.

Keywords:
DNA modificationDNA phosphorothioate modificationdefence systemenvironmental fitnessepigeneticsrestriction modification

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Area of Science:

  • Microbiology
  • Biochemistry
  • Molecular Biology

Background:

  • Phosphorothioate (PT) linkages, where oxygen is replaced by sulfur, enhance DNA/RNA nuclease tolerance.
  • PT modification occurs naturally in bacteria, mediated by the dndABCDE gene products.
  • Bacterial PT systems function similarly to DNA methylation-based restriction-modification (R-M) systems for defense.

Purpose of the Study:

  • To investigate the natural occurrence and function of phosphorothioate modification in bacteria.
  • To compare bacterial PT systems with known DNA methylation-based R-M systems.
  • To understand the role of PT modification in bacterial cellular processes and environmental fitness.

Main Methods:

  • Analysis of dndABCDE gene products' catalytic activity.
  • Comparison of PT and methylation-based R-M system recognition sequences.
  • Investigation of PT modification's impact on cellular redox homeostasis and environmental adaptation.

Main Results:

  • The dndABCDE gene products catalyze sequence-selective, stereospecific PT modification in bacteria.
  • PT and methylation-based R-M systems target distinct DNA sequences to avoid functional interference.
  • PT modification contributes to bacterial redox homeostasis, epigenetic regulation, and environmental fitness.

Conclusions:

  • Bacterial PT modification is a defense mechanism analogous to R-M systems, with unique roles in cellular processes.
  • Horizontal gene transfer likely explains the widespread distribution of dnd systems.
  • PT lability under oxidative stress and susceptibility to specific endonucleases contribute to its sporadic distribution.