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Determination of global DNA methylation level by methylation-sensitive comet assay in patients with urinary bladder

Ozer Kocak1, Selin Kankaya2, Goktug Kalender3

  • 1Department of Medical Biochemistry, Cerrahpasa Medical Faculty, Istanbul University-Cerrahpasa, Istanbul 34098, Turkey.

Mutagenesis
|August 10, 2024
PubMed

Insights

Global DNA methylation levels are significantly higher in bladder cancer patients. Methylation-sensitive comet assay shows potential as a noninvasive biomarker for early cancer detection and monitoring.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • DNA methylation regulates gene expression and genomic stability.
  • Aberrant DNA methylation is linked to early carcinogenesis.
  • Evaluating DNA methylation is crucial for effective anti-cancer therapy.

Purpose of the Study:

  • To determine global DNA methylation levels in urinary bladder cancer patients.
  • To assess the utility of the methylation-sensitive comet assay for this purpose.

Main Methods:

  • Global DNA methylation levels were measured using the methylation-sensitive comet assay.
  • McrBC enzyme was employed for enzymatic digestion at methylated sites.
  • Receiver Operating Characteristic (ROC) curve analysis evaluated clinical performance.

Main Results:

  • Global DNA methylation levels were significantly elevated in bladder cancer patients compared to controls.
  • The methylation-sensitive comet assay achieved 92% sensitivity and 42% specificity with a 6.5% DNA methylation cutoff.

Conclusions:

  • Global DNA methylation measured by methylation-sensitive comet assay is a potential noninvasive biomarker.
  • This assay may reduce the need for invasive diagnostic and follow-up procedures in urinary bladder cancer.
Keywords:
McrBC enzymeglobal DNA methylationmethylation-sensitive comet assayurinary bladder cancer

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