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Related Concept Videos

Epigenetic Regulation01:37

Epigenetic Regulation

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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Quantifying Epigenetic Changes Induced by Chemical Exposure Using the epi-TK Assay.

Shiro Kuroki1, Haruto Yamada1, Mizuki Odagiri1

  • 1Department of Biology, Graduate School of Science, Chiba University, Chiba, Japan.

Bio-Protocol
|April 27, 2026
PubMed
Summary

A new reporter assay, the epi-TK assay, quantitatively detects chemical-induced epigenetic alterations without DNA damage. This cost-effective method aids in evaluating epigenetic toxicity for chemical safety assessments.

Keywords:
DNMT inhibitorEpi-genotoxicityReporter assayTK geneTK6Toxicology

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Area of Science:

  • Epigenetics and Toxicology
  • Molecular Biology
  • Chemical Safety Assessment

Background:

  • Epigenetic modifications regulate gene expression and cellular identity.
  • Chemicals can cause cancer via epigenetic alterations, independent of DNA damage.
  • Standard genotoxicity assays lack specific epigenetic evaluation.

Purpose of the Study:

  • To develop a simple, cost-effective, and quantitative reporter assay for chemically induced epigenetic alterations.
  • To establish a method for evaluating epigenetic toxicity in chemical safety frameworks.
  • To enable sensitive detection of epigenetic state transitions.

Main Methods:

  • Development of the epi-TK assay using an engineered human lymphoblastoid cell line (mTK6).
  • Site-specific methylation of the endogenous thymidine kinase (TK) gene promoter to achieve transcriptional repression.
  • Quantification of TK revertant colonies after chemical exposure to detect epigenetic perturbations.

Main Results:

  • The epi-TK assay successfully detected epigenetic alterations induced by a DNA methyltransferase 1 inhibitor (GSK3484862).
  • The assay demonstrated sensitive and quantitative detection of epigenetic state transitions.
  • The method allowed bi-directional detection of epigenetic changes, including DNA demethylation and histone modification alterations.

Conclusions:

  • The epi-TK assay provides a practical and quantitative platform for evaluating epigenetic toxicity.
  • This assay is suitable for routine testing and comparative assessment of multiple compounds.
  • The epi-TK assay has potential applications in chemical safety assessment frameworks.