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Updated: Jul 10, 2026

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

Mitochondrial regulation of cancer associated nuclear DNA methylation

Cheng-hui Xie1, Akihiro Naito, Takatsugu Mizumachi

  • 1Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, 4301 West Markham slot 516 Little Rock, AR 72205-7199, USA.

Biochemical and Biophysical Research Communications
|October 30, 2007
PubMed

Insights

Mitochondrial DNA loss triggers cancer progression by causing hypermethylation of key gene promoters, including endothelin B receptor and E-cadherin, through increased DNA methyltransferase 1 expression.

Area of Science:

  • Cancer Biology
  • Epigenetics
  • Mitochondrial Biology

Background:

  • Cancer development is linked to gene silencing via methylation, but mechanisms remain unclear.
  • Previous work showed reduced mitochondrial DNA content accelerates cancer progression.
  • The precise molecular link between mitochondrial DNA and epigenetic regulation in cancer is not fully understood.

Purpose of the Study:

  • To investigate the mechanism by which mitochondrial DNA deficiency influences gene promoter methylation.
  • To identify the specific genes affected by methylation changes in mitochondrial DNA-deficient cells.
  • To determine the role of DNA methyltransferase 1 in this process.

Main Methods:

  • Comparison of mitochondrial DNA-deficient (LNrho0-8) and parental (LNCaP) cell lines.
  • Analysis of DNA methylation patterns at specific gene promoters (endothelin B receptor, O6-methylguanine-DNA methyltransferase, E-cadherin).
  • Assessment of DNA methyltransferase 1 expression and the effect of its inhibition.

Main Results:

  • Mitochondrial DNA-deficient cells exhibited hypermethylation of endothelin B receptor, O6-methylguanine-DNA methyltransferase, and E-cadherin promoters.
  • These promoters were unmethylated with corresponding gene expression in mitochondrial DNA-containing cells.
  • Absence of mitochondrial DNA induced DNA methyltransferase 1 expression, driving hypermethylation.
  • Inhibiting DNA methyltransferase 1 reversed hypermethylation and restored gene product expression.

Conclusions:

  • Loss or reduction of mitochondrial DNA induces DNA methyltransferase 1.
  • This leads to hypermethylation of critical gene promoters (endothelin B receptor, O6-methylguanine-DNA methyltransferase, E-cadherin).
  • Consequently, the expression of these tumor-suppressor genes is reduced, potentially driving cancer progression.

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