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Related Experiment Video

Updated: May 10, 2025

Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
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Highly Sensitive and Specific Lateral Flow Detection for DNA Methylation Based on GIaI-Mediated

Lihui Ke1, Hang Zhao2, Hongbo Shan3

  • 1Department of Thoracic Surgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China.

Micromachines
|April 26, 2025
PubMed
Summary

This study introduces a novel DNA methylation detection method combining GlaI digestion and STEM-PCR for sensitive and specific cancer biomarker analysis. The assay offers a simple, visual readout for early disease diagnosis.

Keywords:
DNA methylation detectionSTEM-PCRSeptin 9methylation-dependent restriction endonucleases

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Last Updated: May 10, 2025

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Cancer Diagnostics

Background:

  • Accurate DNA methylation detection is vital for early disease diagnosis, especially in oncology.
  • Existing methods struggle to balance sensitivity and specificity in methylation analysis.
  • Methylated Septin 9 is a key biomarker for colorectal cancer detection.

Purpose of the Study:

  • To develop a novel, highly sensitive, and specific DNA methylation detection assay.
  • To integrate methylation-dependent restriction enzyme digestion with advanced PCR amplification and visual detection.
  • To validate the assay's performance for detecting colorectal cancer biomarkers.

Main Methods:

  • Utilized methylation-dependent restriction endonuclease (GlaI) digestion for specificity.
  • Employed specific terminal-mediated polymerase chain reaction (STEM-PCR) for efficient amplification.
  • Integrated lateral flow detection (LFD) for a simple, visual readout.

Main Results:

  • Achieved high sensitivity (0.1%, 10 copies/reaction) in detecting methylated Septin 9.
  • Demonstrated excellent specificity with no cross-reactivity against unmethylated DNA.
  • Validated the assay with FFPE samples, showing 100% consistency with real-time STEM-PCR.

Conclusions:

  • The novel STEM-PCR-LFD assay provides a sensitive, specific, and accessible platform for DNA methylation detection.
  • This method holds significant potential for the early diagnosis of various human diseases, particularly cancers.
  • The integrated approach overcomes limitations of conventional methylation detection techniques.