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Quantitative DNA Methylation Analysis at Single-Nucleotide Resolution by Pyrosequencing®.

Florence Busato1, Emelyne Dejeux1, Hafida El Abdalaoui1

  • 1Laboratory for Epigenetics and Environment, Centre National de Recherche en Génomique Humaine, CEA-Institut de Biologie Francois Jacob, Bâtiment G2, 2 rue Gaston Crémieux, 91000, Evry, France.

Methods in Molecular Biology (Clifton, N.J.)
|December 11, 2017
PubMed
Summary

Pyrosequencing offers a quantitative and accurate method for gene-specific DNA methylation analysis, overcoming limitations of older techniques. This real-time sequencing technology enables precise measurement of cytosine methylation at multiple CpG sites.

Keywords:
BiomarkerBisulfiteEpigenotypingHeterogeneous DNA methylationPyrosequencingQuantificationReal-time synthesis

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Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Traditional DNA methylation analysis methods are often labor-intensive and lack quantitative accuracy.
  • Existing protocols may be restricted to analyzing only a few CpG sites, limiting comprehensive analysis.

Purpose of the Study:

  • To introduce and detail the application of Pyrosequencing for quantitative, locus-specific DNA methylation analysis.
  • To highlight Pyrosequencing as an advancement over traditional methods for methylation studies.

Main Methods:

  • Genomic DNA undergoes bisulfite modification.
  • Target regions are amplified via PCR using a biotinylated primer.
  • Single-stranded DNA templates are used for Pyrosequencing with a specific primer to analyze cytosine methylation.

Main Results:

  • Pyrosequencing provides accurate and reproducible locus-specific DNA methylation analyses.
  • The technology is effective for validating genome-wide methylation findings.
  • It is suitable for clinical applications, such as MGMT promoter methylation analysis.

Conclusions:

  • Pyrosequencing is a versatile and robust tool for quantitative DNA methylation analysis.
  • Its ease of implementation and high-quality results make it valuable for both research and clinical settings.
  • The technology facilitates the identification of differentially methylated positions in close proximity.