High-density methylation of p14ARF and p16INK4A in Epstein-Barr virus-associated gastric carcinoma.

Abstract:

:Promoter hypermethylation of various tumor-related genes is extremely frequent in gastric carcinoma (GC) associated with Epstein-Barr virus (EBV). To investigate the significance of the promoter methylation in this type of GC, we examined the methylation densities of the promoter regions of p14ARF and p16INK4A in EBV-associated (n=7) and EBV-negative (n=14) GC. Bisulfite sequencing demonstrated a high frequency of concurrent methylation of p14ARF and p16INK4A promoter regions in EBVaGC. Methylation was observed in all 29 CpG sites of p14ARF and all 16 sites of p16INK4A with equally high densities. In EBV-negative GC, the methylation profiles differed between the 2 genes. Promoter methylation was sporadic and variable in p14ARF, and only the last position of CpG in p14ARF was methylated at high frequency. High-density methylation in p16INK4A was observed in a subset of GC, but the first position of CpG was never methylated in EBV-negative GC. These findings suggest the presence of mechanisms of de novo and maintenance methylation specific to EBVaGC that might be associated with EBV infection.

journal_name

Int J Cancer

authors

Sakuma K,Chong JM,Sudo M,Ushiku T,Inoue Y,Shibahara J,Uozaki H,Nagai H,Fukayama M

doi

10.1002/ijc.20420

keywords:

subject

Has Abstract

pub_date

2004-11-01 00:00:00

pages

273-8

issue

2

eissn

0020-7136

issn

1097-0215

journal_volume

112

pub_type

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