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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
Published on: September 18, 2020
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Epigenetic alterations in a gastric leiomyoma
M T Branham1, M Pellicer2, E Campoy1
1Institute of Histology and Embryology (IHEM-CCT-CONICET) and School of Medical Sciences, National University of Cuyo, M5502JMA Mendoza, Argentina.
Case Reports in Gastrointestinal Medicine
|December 30, 2014
Summary
Gastric leiomyomas show aberrant DNA methylation in tumor suppressor and DNA repair genes, particularly MLH1. This study explores methylation patterns in gastric leiomyomas, differentiating them from GISTs.
Area of Science:
- Gastroenterology
- Molecular Biology
- Epigenetics
Background:
- Gastric leiomyomas are stomach neoplasms, often asymptomatic but can cause ulceration.
- Aberrant DNA methylation is a known epigenetic change in neoplasms.
- The relationship between gene methylation and malignant phenotype requires further investigation.
Purpose of the Study:
- To analyze the DNA methylation status of 84 CpG islands in tumor suppressor and DNA repair genes within a gastric leiomyoma.
- To compare methylation patterns between the tumor center (TC) and tumor periphery (TP).
- To investigate the potential of these methylation patterns to differentiate gastric leiomyomas from gastrointestinal stromal tumors (GISTs).
Main Methods:
- Analysis of DNA methylation status of 84 CpG islands in tumor suppressor and DNA repair genes.
- Separate analysis of tumor center (TC) and tumor periphery (TP) samples.
- Assessment of microsatellite instability using the Bat-26 marker.
Main Results:
- Aberrant methylation found in 2/84 CpGIs in TC (MLH1, MSH3) and 5/84 CpGIs in TP (MLH1, MSH3, APC, MSH6, MGMT).
- MLH1 exhibited the highest methylation percentage in both TC and TP.
- No microsatellite instability was detected in either TC or TP, despite MLH1 methylation.
Conclusions:
- This study is the first to associate MLH1, MGMT, and APC gene methylation with gastric leiomyoma.
- Identified methylation patterns may aid in distinguishing gastric leiomyomas from GISTs.
- Further research is needed to identify reliable molecular markers for differentiating gastric leiomyomas and GISTs.
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