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Related Concept Videos

Epigenetic Regulation01:37

Epigenetic Regulation

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
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Related Experiment Video

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Targeted DNA Methylation Analysis by Next-generation Sequencing
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Precise Determination of CpG Methylation through Entropy-Driven Cascade Circuit.

Xiaohui Chen1,2, Haixia Liu1, Ningyu Ma1

  • 1Department of Laboratory Medicine, Chongqing General Hospital, School of Medicine, Chongqing University, Chongqing 400044, P. R. China.

Analytical Chemistry
|June 6, 2025
PubMed
Summary

This study presents a novel method for detecting DNA methylation, crucial in cancer development. The approach offers high sensitivity and speed for early cancer diagnosis and monitoring.

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DNA Methylation: Bisulphite Modification and Analysis
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Nanotechnology

Background:

  • Aberrant DNA methylation is a key factor in malignant tumor development.
  • Accurate and sensitive detection of DNA methylation in clinical samples is challenging.

Purpose of the Study:

  • To develop a sensitive and specific method for determining DNA methylation.
  • To enable early cancer diagnosis and monitoring through precise methylation detection.

Main Methods:

  • Utilized multiple isothermal amplification cascades with quantum dot signal output.
  • Employed an entropy-driven circuit for specific recognition of the P16 promoter methylation site.
  • Integrated G-quadruplex-rich DNA polymer nanowires with quantum dot-labeled TMPyP for fluorescence signal generation.

Main Results:

  • Achieved a highly sensitive detection limit of 358.92 aM for P16 promoter methylation.
  • Demonstrated reliable signal output for trace target detection within 1.5 hours.
  • Covered a methylation concentration range from 1 fM to 1 nM.

Conclusions:

  • The developed approach provides a sensitive and rapid method for DNA methylation determination.
  • This technique offers a new strategy for the early diagnosis and monitoring of cancer development.