DNA methylation profile in diffuse type gastric cancer: evidence for hypermethylation of the BRCA1 promoter region in early-onset gastric carcinogenesis

DNA methylation profile in diffuse type gastric cancer: evidence for hypermethylation of the BRCA1 promoter region in early-onset gastric carcinogenesis

Diffuse type gastric carcinoma is the most aggressive type of gastric cancer. This type of tumor is not preceded by precancerous changes and is associated with early-onset and hereditary syndromes. To test the hypothesis that DNA methylation profile would be useful for molecular classification of th...

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Bibliographic Details
Published in:Biological research Vol. 41; no. 3; pp. 303 - 315
Main Authors: Bernal, Carolina, Vargas, Macarena, Ossandón, Francisco, Santibáñez, Eudocia, Urrutia, Julio, Luengo, Víctor, Zavala, Luis F, Backhouse, Claudia, Palma, Mariana, Argandoña, Jorge, Aguayo, Francisco, Corvalán, Alejandro
Format: Journal Article
Language:English
Published: England Sociedad de Biología de Chile 2008
BMC
Subjects:
BIOLOGY
BRCA-1
Cluster Analysis
CpG Islands - genetics
diffuse type
DNA Methylation - genetics
DNA, Neoplasm - genetics
Early Diagnosis
early-onset
Female
gastric cáncer
Gastric Mucosa - pathology
Genes, BRCA1
Humans
Immunohistochemistry
Male
Middle Aged
Polymerase Chain Reaction
Precancerous Conditions - genetics
Promoter Regions, Genetic - genetics
Stomach Neoplasms - diagnosis
Stomach Neoplasms - genetics
Stomach Neoplasms - pathology
BRCA-1
gastric cáncer
diffuse type
early-onset
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Summary:Diffuse type gastric carcinoma is the most aggressive type of gastric cancer. This type of tumor is not preceded by precancerous changes and is associated with early-onset and hereditary syndromes. To test the hypothesis that DNA methylation profile would be useful for molecular classification of the diffuse type gastric carcinoma, DNA methylation patterns of the CpG Island of 17 genes were studied in 104 cases and 47 normal adjacent gastric mucosa by Methylation-specific PCR, Immunohistochemistry and Hierarchical clustering analysis. The most frequent methylated genes were FHIT, E-cadherin, BRCA1 and APC (>50%), followed by p14, p16, p15, p73, MGMT and SEMA3B (20-49%). Hierarchical clustering analysis reveals four groups with different clinical features. The first was characterized by hypermethylation of BRCA1 and younger age (<45 years old), and the second by hypermethylation of p14 and p16 genes, male predominance and Epstein-Barr virus infection. The third group was characterized by hypermethylation of FHIT and antrum located tumors and the fourth was not associated with any clinical variables. In normal adjacent mucosa only the p73 gene was significantly less methylated in comparison to tumor mucosa. DNA methylation identified subgroups of diffuse type gastric cancer. Hypermethylation of BRCA1 associated with young age suggests a role in early-onset gastric carcinoma.
ISSN:0716-9760
0717-6287
0716-9760
DOI:10.4067/s0716-97602008000300007