DNA Methylation Patterns of Ulcer-Healing Genes Associated with the Normal Gastric Mucosa of Gastric Cancers
Journal of Korean Medical Science
; : 405-417, 2010.
Article
de En
| WPRIM
| ID: wpr-161038
Bibliothèque responsable:
WPRO
ABSTRACT
Recent evidence suggests that gastric mucosal injury induces adaptive changes in DNA methylation. In this study, the methylation status of the key tissue-specific genes in normal gastric mucosa of healthy individuals and cancer patients was evaluated. The methylation-variable sites of 14 genes, including ulcer-healing genes (TFF1, TFF2, CDH1, and PPARG), were chosen from the CpG-island margins or non-island CpGs near the transcription start sites. The healthy individuals as well as the normal gastric mucosa of 23 ulcer, 21 non-invasive cancer, and 53 cancer patients were examined by semiquantitative methylation-specific polymerase chain reaction (PCR) analysis. The ulcer-healing genes were concurrently methylated with other genes depending on the presence or absence of CpG-islands in the normal mucosa of healthy individuals. Both the TFF2 and PPARG genes were frequently undermethylated in ulcer patients. The over- or intermediate-methylated TFF2 and undermethylated PPARG genes was more common in stage-1 cancer patients (71%) than in healthy individuals (10%; odds ratio [OR], 21.9) and non-invasive cancer patients (21%; OR, 8.9). The TFF2-PPARG methylation pattern of cancer patients was stronger in the older-age group (> or =55 yr; OR, 43.6). These results suggest that the combined methylation pattern of ulcer-healing genes serves as a sensitive marker for predicting cancer-prone gastric mucosa.
Mots clés
Texte intégral:
1
Indice:
WPRIM
Sujet Principal:
Peptides
/
Tumeurs de l'estomac
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Ulcère gastrique
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Cicatrisation de plaie
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Marqueurs biologiques
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Cadhérines
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Régulation de l'expression des gènes tumoraux
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Substances de croissance
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Ilots CpG
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Méthylation de l'ADN
Type d'étude:
Prognostic_studies
Limites du sujet:
Female
/
Humans
/
Male
langue:
En
Texte intégral:
Journal of Korean Medical Science
Année:
2010
Type:
Article