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Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
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Complete inactivation of DNMT1 leads to mitotic catastrophe in human cancer cells

Taiping Chen1, Sarah Hevi, Frédérique Gay

  • 1Epigenetics Program, Novartis Institutes for Biomedical Research, 250 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.

Nature Genetics
|February 27, 2007
PubMed

Insights

DNA methyltransferase 1 (DNMT1) is crucial for maintaining DNA methylation patterns in human cancer cells. Its disruption causes cell cycle arrest, mitotic defects, and cell death, highlighting DNMT1

Area of Science:

  • Molecular Biology
  • Epigenetics
  • Cancer Biology

Background:

  • DNA (cytosine-5-)-methyltransferase 1 (DNMT1) is essential for maintaining CpG methylation in mice.
  • The function of DNMT1 in human cancer cells is controversial and requires further investigation.

Purpose of the Study:

  • To investigate the role of DNMT1 in maintaining DNA methylation and its impact on cell proliferation and survival in human cancer cells.

Main Methods:

  • Generated a DNMT1 conditional allele in HCT116 colorectal carcinoma cells using homologous recombination.
  • Utilized Cre recombinase to disrupt the DNMT1 allele, leading to hemimethylation of CpG sites.
  • Analyzed cell cycle progression, mitotic fidelity, and cell death following DNMT1 disruption.

Main Results:

  • DNMT1 disruption resulted in hemimethylation of approximately 20% of CpG-CpG dyads.
  • Cells exhibited G2/M checkpoint activation and G2 phase arrest.
  • Cells displayed severe mitotic defects and subsequent cell death or tetraploid G1 arrest.

Conclusions:

  • DNMT1 is essential for maintaining DNA methylation patterns in human cancer cells.
  • DNMT1 plays a critical role in ensuring cell proliferation and survival.
  • Targeting DNMT1 may represent a therapeutic strategy for colorectal carcinoma.

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