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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer

Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer

Published on: September 18, 2020

Global DNA methylation analysis using methyl-sensitive amplification polymorphism (MSAP).

Mahmoud W Yaish¹, Mingsheng Peng, Steven J Rothstein

¹Department of Biology, College of Science, Sultan Qaboos University, Muscat, Oman.

Methods in Molecular Biology (Clifton, N.J.)

|September 24, 2013

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Methyl-Sensitive Amplification Polymorphism (MSAP) reveals DNA methylation patterns to distinguish individuals and map genes. This epigenetic technique analyzes differential DNA digestion for genetic studies in organisms like Arabidopsis.

Area of Science:

Epigenetics
Molecular Biology
Genetics

Background:

DNA methylation is a key epigenetic mechanism regulating gene transcription in eukaryotes.
Understanding DNA methylation patterns in regulatory sequences is vital for deciphering transcriptional control.
Various methods exist for DNA methylation detection, including bisulfite sequencing and restriction digestion.

Purpose of the Study:

To introduce and demonstrate the utility of Methyl-Sensitive Amplification Polymorphism (MSAP) for global DNA methylation analysis.
To showcase MSAP's application in distinguishing individuals based on methylation status and in DNA methylation mapping.
To illustrate the assessment of genetic modulation of DNA methylation using MSAP in Arabidopsis mutants and treated wild-type plants.

Main Methods:

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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer

Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer

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Genomic DNA is digested with methylation-sensitive (e.g., HpaII) and insensitive (e.g., MspI) restriction enzymes.
DNA fragments are ligated to adaptors and selectively amplified using fluorescently labeled primers.
Polymorphic loci are identified by comparing PCR products, followed by fragment isolation, sequencing, and database identification.

Main Results:

MSAP effectively identifies differentially methylated loci, enabling the distinction between individuals based on DNA methylation profiles.
The technique facilitates DNA methylation mapping and positional cloning of genes exhibiting differential methylation.
Analysis of Arabidopsis mutants (met1, ddm1, atmbd9) and 5-azaC/zebularine treated plants demonstrates MSAP's capability to assess genetic modulation of DNA methylation.

Conclusions:

MSAP is a reliable technique for identifying polymorphic methylated loci.
The method aids in understanding epigenetic regulation and genetic variation related to DNA methylation.
MSAP's effectiveness is confined to the restriction sites of the enzymes employed for DNA digestion.