Related Experiment Video

Updated: Sep 17, 2025

Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
06:07

Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors

Published on: August 5, 2022

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DNA methylation protects cancer cells against senescence

Xiaoying Chen1, Kosuke Yamaguchi2,3, Brianna Rodgers1

  • 1Université Paris Cité, CNRS, Epigenetics and Cell Fate, Paris, France.

Nature Communications
|July 2, 2025
PubMed

Insights

Decreasing DNA methylation in cancer cells induces senescence, characterized by cell cycle arrest and specific molecular markers. This occurs independently of DNA damage, offering new therapeutic strategies.

Area of Science:

  • Oncology
  • Epigenetics
  • Cellular Biology

Background:

  • DNA methylation inhibitors like 5-aza-deoxycytidine are used in cancer research and treatment.
  • Disentangling the effects of DNA methylation loss from DNA damage caused by these inhibitors is difficult.

Purpose of the Study:

  • To differentiate the effects of reduced DNA methylation from DNA damage in cancer cells.
  • To investigate the cellular and in vivo consequences of decreased DNA methylation.

Main Methods:

  • Utilized degron alleles of DNA methylation regulators to separate DNA methylation loss from DNA damage.
  • Assessed cancer cell responses including cell cycle arrest, senescence-associated secretory phenotype (SASP), and senescence markers.
  • Conducted xenograft experiments to evaluate in vivo effects.

Main Results:

  • Cancer cells with reduced DNA methylation but no DNA damage exhibited hallmarks of cellular senescence, including G1 arrest, SASP, and SA-β-gal positivity.
  • This senescence was independent of p53 and Rb but involved cytoplasmic p21 and nuclear, STING-independent cGAS.
  • In vivo xenograft studies demonstrated that decreasing DNA methylation can induce tumor cell senescence.

Conclusions:

  • Loss of DNA methylation intrinsically induces cellular senescence in cancer cells, independent of DNA damage.
  • p21 and cGAS play key roles in this novel senescence pathway.
  • Targeting DNA methylation to induce senescence presents a promising therapeutic avenue in oncology.

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