Aberrant DNA Methylation in Gastric Cancer Systems
Summary
Aberrant DNA methylation constitutes a defining epigenetic alteration in gastric carcinogenesis, characterised by focal hypermethylation of tumour suppressor gene promoters alongside global hypomethylation of repetitive elements. These changes disrupt normal transcriptional regulation, leading to silencing of DNA repair genes, cell-cycle regulators and apoptosis mediators, while activating oncogenic pathways. Persistent environmental insults such as chronic inflammation and Helicobacter pylori infection promote DNA methylation drift, establishing a “field defect” that predisposes to multifocal neoplasia. High-throughput profiling has delineated methylation-based subgroups, including a CpG island methylator phenotype (CIMP) associated with distinct clinical outcomes. Aberrant methylation signatures are now exploited for early detection, prognostic stratification and the design of epigenetic therapies aimed at reactivating silenced genes or modulating methylation machinery.
Research from Nature Portfolio
Long-term follow-up of patients after H. pylori eradication has revealed selective reversibility of aberrant methylation in non-intestinal mucosa, whereas intestinal metaplasia retains high levels of CpG island methylation. This persistence of a CIMP in metaplastic tissue correlates with subsequent cancer risk, suggesting that methylation profiling of intestinal metaplasia could serve as a surrogate marker for residual neoplastic potential. Moreover, specific microRNA loci, notably miR-124a-3 and miR-34c, show methylation events tightly linked to intestinal-type changes and may represent early epigenetic alterations independent of overt malignancy.
Aberrant DNA Methylation in Gastric Cancer Systems publication trend
The graph below shows the total number of articles in aberrant dna methylation in gastric cancer systems across all publications each year (not limited to Nature Index journals).
Technical terms
DNA methylation: Covalent addition of a methyl group to cytosine bases, typically at CpG dinucleotides, modulating gene expression without altering the DNA sequence.
CpG island: Regions of high CpG density often located at gene promoters, susceptible to aberrant hypermethylation in cancer.
Promoter region: DNA sequence upstream of a gene that controls transcription initiation; methylation here can silence gene expression.
Demethylation: Enzymatic removal of methyl groups from DNA, often mediated by TET family enzymes, enabling gene reactivation.
CpG island methylator phenotype (CIMP): A tumour subclass exhibiting widespread hypermethylation of CpG islands, associated with distinct clinical and molecular features.
References
- Epigenetic reprogramming in gastrointestinal cancer: biology and translational perspectives. MedComm (2024).
- Helicobacter pylori-induced aberrant demethylation and expression of GNB4 promotes gastric carcinogenesis via the Hippo–YAP1 pathway. BMC Medicine (2023).
- Accumulation of genetic and epigenetic alterations in normal cells and cancer risk. npj Precision Oncology (2019).
- A DNA methylation signature to improve survival prediction of gastric cancer. Clinical Epigenetics (2020).
- Long-term effects of H. pylori eradication on epigenetic alterations related to gastric carcinogenesis. Scientific Reports (2018).
- DNA methylation subgroups and the CpG island methylator phenotype in gastric cancer: a comprehensive profiling approach. BMC Gastroenterology (2014).
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