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Related Experiment Video

Updated: Apr 3, 2026

Targeted DNA Methylation Analysis by Next-generation Sequencing
08:38

Targeted DNA Methylation Analysis by Next-generation Sequencing

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An improved sequencing-based strategy to estimate locus-specific DNA methylation.

Giulia Brisotto1, Alessandra di Gennaro2, Valentina Damiano3

  • 1Experimental Oncology 1, CRO Aviano National Cancer Institute, via F. Gallini 2, Aviano, 33081, PN, Italy. gbrisotto@cro.it.

BMC Cancer
|September 23, 2015
PubMed
Summary

A new normalized bisulfite sequencing (NBSP) method accurately quantifies DNA methylation at single CpG sites. This cost-effective approach improves upon traditional methods and is effective for FFPE samples, offering diagnostic potential.

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Cancer Research

Background:

  • DNA methylation is a key epigenetic regulator of gene expression, crucial for cellular functions.
  • Aberrant DNA methylation is linked to cancer, affecting microRNA and gene expression (e.g., miR-200c/miR-141, E-cadherin).
  • Existing DNA methylation assessment methods (e.g., bisulfite sequencing) can be time-consuming and costly, with Sanger sequencing (BSP) yielding noisy data.

Purpose of the Study:

  • To develop an improved, reliable, and cost-effective DNA methylation assessment protocol.
  • To overcome limitations of conventional BSP, such as noise and nucleotide signal imbalance.
  • To enable precise DNA methylation analysis at single CpG resolution.

Main Methods:

  • Introduced normalized-BSP (NBSP), utilizing tailed C-balanced primers and a C/T ratio normalization procedure.
  • Applied NBSP to quantify methylation at the miR-200c/miR-141 locus and E-cadherin promoter.
  • Compared NBSP with conventional methods and a cloning-based protocol using serial dilutions and FFPE breast cancer samples.

Main Results:

  • NBSP demonstrated superior accuracy in estimating methylated cytosine fractions compared to conventional BSP.
  • NBSP results aligned with the established cloning-based protocol for miR-200c/miR-141 and E-cadherin promoter methylation.
  • Methylation levels at the miR-200c/miR-141 locus correlated with decreased miRNA expression in cell lines and FFPE samples.

Conclusions:

  • NBSP provides a rapid, economical, and accurate method for locus-specific DNA methylation assessment at single CpG resolution.
  • The method is effective on FFPE samples, highlighting its potential utility in diagnostic applications.
  • NBSP offers a practical alternative for precise DNA methylation analysis in research and diagnostics.