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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
Published on: September 18, 2020
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Dynamic changes in DNA methylation patterns in canine lymphoma cell lines demonstrated by genome-wide quantitative
J Yamazaki1, J Jelinek2, S Hisamoto1
1Laboratory of Molecular Medicine, Graduate School of Veterinary Medicine, Hokkaido University, Japan.
Veterinary Journal (London, England : 1997)
|February 13, 2018
Summary
This study introduces a novel genome-wide DNA methylation analysis method for dogs. The technique identified significant methylation changes in canine lymphoma cell lines, highlighting potential biomarkers for cancer.
Area of Science:
- Epigenetics
- Comparative genomics
- Canine molecular biology
Background:
- DNA methylation, the modification of cytosine to 5-methylcytosine, influences DNA-protein interactions and gene expression.
- Cytosine-guanine island (CGI) methylation is linked to gene silencing, but genome-wide canine methylation data is scarce.
- Previous canine DNA methylation studies focused on global changes or limited loci.
Purpose of the Study:
- To develop and validate a next-generation sequencing method for quantitative, genome-wide DNA methylation analysis in dogs.
- To identify specific DNA methylation changes in canine lymphoma cell lines compared to healthy controls.
- To explore the potential of DNA methylation analysis for canine disease research.
Main Methods:
- Developed a novel method using sequential digestion of genomic DNA with SmaI and XmaI enzymes to create methylation-specific signatures.
- Applied next-generation sequencing to analyze approximately 100,000 CpG sites across the canine genome.
- Compared DNA methylation patterns in blood from healthy dogs with those from canine lymphoma cell lines.
Main Results:
- Established baseline methylation patterns: CGIs were largely unmethylated, while non-CpG islands (NCGIs) were methylated in healthy dog blood.
- Identified thousands of CpG sites with altered methylation in lymphoma cell lines: hypermethylation at CGI promoters and hypomethylation at NCGI sites.
- Discovered hypermethylated CpG sites in promoter CGIs of genes including TWIST2 and TLX3, and genes with 'Homeobox' and 'DNA-binding' characteristics.
Conclusions:
- Genome-wide quantitative DNA methylation analysis is feasible and sensitive in dogs using the novel method.
- Significant DNA methylation alterations occur in canine lymphoma, with implications for gene expression.
- This approach holds promise for studying DNA methylation in canine cancers and other diseases.
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