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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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Phase II Reactions: Methylation Reactions01:17

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Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
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Mutagenicity and carcinogenicity refer to the ability of drugs to cause genetic defects and induce cancer, respectively. The International Agency for Research on Cancer (IARC) classifies agents into four groups based on their carcinogenic potential. Group 1 agents are known human carcinogens; group 2A agents are probably carcinogenic to humans; group 3 agents lack data to support their role in carcinogenesis; and group 4 includes agents for which data support that they are not likely to be...
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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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ROS-mediated DNA methylation pattern alterations in carcinogenesis.

Qihan Wu, Xiaohua Ni1

  • 1Department of Pharmaceutical Development, Shanghai Institute of Planned Parenthood Research, National Population & Family Planning Key Laboratory of Contraceptive Drugs and Devices, Shanghai, China. xhni_sippr@163.com.

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Reactive oxygen species (ROS) influence DNA methylation in cancer, promoting hypermethylation of tumor suppressor genes and global hypomethylation through various mechanisms. Understanding these epigenetic changes is key for cancer diagnostics and therapies.

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Area of Science:

  • Epigenetics
  • Cancer Biology
  • Oxidative Stress

Background:

  • Elevated reactive oxygen species (ROS) and altered DNA methylation are hallmarks of cancer.
  • The intricate relationship between ROS and DNA methylation in cancer pathogenesis remains incompletely understood.

Purpose of the Study:

  • To elucidate the cause-consequence relationship between ROS and DNA methylation dynamics in cancer cells.
  • To explore the mechanisms by which ROS-induced oxidative stress impacts DNA methylation patterns.

Main Methods:

  • Review and synthesis of existing cancer research on ROS and DNA methylation.
  • Analysis of how oxidative DNA damage structures (8-OHdG, 5hmC) affect methylation.
  • Investigation of ROS's role as a catalyst for DNA methylation and its impact on DNA methyltransferases (DNMTs).

Main Results:

  • ROS-induced oxidative stress is linked to both hypermethylation of tumor suppressor gene promoters and global hypomethylation.
  • Oxidative products like 8-OHdG can inhibit DNA methylation, while 5hmC may actively promote demethylation.
  • ROS can catalyze DNA methylation, upregulating DNMTs and forming new DNMT complexes, leading to site-specific hypermethylation.
  • These ROS-driven epigenetic alterations are implicated in malignant transformation and tumor progression.

Conclusions:

  • ROS significantly influence both hypermethylation and hypomethylation through diverse mechanisms, playing a crucial role in cancer epigenetic regulation.
  • Comprehending ROS-mediated epigenetic modifications is vital for understanding carcinogenesis and developing novel cancer biomarkers and therapies.