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Related Concept Videos

DNA Isolation01:24

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DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further processing. For example, plasmid DNA extraction is a bit more complicated than genomic DNA extraction because of the need for an appropriate lysis method to separate plasmid DNA from gDNA during isolation. However, for specific applications, such as long-range DNA sequencing that require a good yield of high- quality DNA samples, we need to follow...
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DNA Methylation: Bisulphite Modification and Analysis
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[Current methods of extracellular DNA methylation analysis].

O E Bryzgunova1,2,3, P P Laktionov1,2

  • 1Institute of Chemical Biology and Fundamental Medicine Siberian Branch Russian Academy of Sciences, Novosibirsk, 630090 Russia.

Molekuliarnaia Biologiia
|May 25, 2017
PubMed
Summary

Analyzing cell-free DNA (cfDNA) methylation is challenging due to low concentrations and high fragmentation. This review details methods for studying cfDNA methylation, hydroxymethylation, and noncanonical methylation for noninvasive cancer diagnostics.

Keywords:
Methylationcell-free DNAemulsion PCRhydroxymethylationmicroarraynon-CpG methylationrestriction endonuclease

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Area of Science:

  • Epigenetics and Molecular Biology
  • Genomics and Bioinformatics
  • Biomedical Diagnostics

Background:

  • Methylated cytosine is crucial for gene expression regulation.
  • Traditional DNA methylation analysis methods face challenges with low-concentration, fragmented cell-free DNA (cfDNA).
  • Accurate cfDNA methylation analysis is vital for noninvasive cancer diagnostics, especially for detecting cancer-specific DNA fractions diluted in excess normal DNA.

Purpose of the Study:

  • To review current methodologies for analyzing cfDNA methylation, hydroxymethylation, and noncanonical methylation.
  • To address the limitations of traditional techniques when applied to cfDNA analysis.
  • To cover approaches for both individual CpG site analysis and large-scale methylation profiling.

Main Methods:

  • Review of existing literature on cfDNA methylation detection techniques.
  • Analysis of methods applicable to low-input and highly fragmented DNA samples.
  • Categorization of techniques based on the scale of analysis (single CpG vs. genome-wide).

Main Results:

  • Identified key challenges in cfDNA methylation analysis, including low concentration, fragmentation, and dilution of cancer-specific signals.
  • Summarized a range of techniques suitable for analyzing cfDNA methylation, hydroxymethylation, and noncanonical modifications.
  • Highlighted methods for analyzing individual CpGs, specific genomic loci, and large-scale methylation patterns.

Conclusions:

  • Despite challenges, advancements in analytical techniques enable cfDNA methylation analysis for noninvasive diagnostics.
  • The reviewed methods offer potential for improved cancer detection and monitoring through epigenetic profiling of cfDNA.
  • Further development of sensitive and specific cfDNA methylation assays is crucial for clinical translation.