Document Detail

Methylation status of normal background mucosa is correlated with occurrence and development of neoplasia in the distal colon.
MedLine Citation:
PMID:  19733896     Owner:  NLM     Status:  MEDLINE    
The aim of this study is to evaluate the methylation status of normal colonic mucosa in relation to the stage of neoplasia arising from the mucosa. The methylation status of 2 age-related loci (ESR1 and MYOD1) and global methylation (the mean of Alu and Sat2) in the normal colonic mucosa of 156 patients with and without colorectal neoplasia were examined. The distal colon and proximal colon were analyzed separately because neoplasia is biologically and clinically different between these sites. The methylation status was determined by MethyLight using percentage of methylated reference (PMR). In the distal colon, methylation of the age-related loci decreased as the stage of neoplasia increased (patients with no neoplasia or with adenoma < or =9 mm versus patients with advanced adenoma or with invasive cancer: ESR1-PMR median, 21.0 versus 15.7; P = .015; MYOD1-PMR median, 5.35 versus 3.80; P = .0037, respectively). Interestingly, global methylation was inversely correlated with the stage of neoplasia (59.7 versus 61.5; P = .054). In contrast, the proximal colon showed no significant correlations. The methylation of MYOD1 in the normal mucosa was significantly correlated with K-ras mutation in neoplastic tissue arising from the mucosa. Specific epigenetic changes in normal colonic mucosa may be correlated with the occurrence and development of neoplasia in the distal colon.
Sakiko Hiraoka; Jun Kato; Joichiro Horii; Shunsuke Saito; Keita Harada; Hideyuki Fujita; Motoaki Kuriyama; Koji Takemoto; Toshio Uraoka; Kazuhide Yamamoto
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Publication Detail:
Type:  Journal Article     Date:  2009-09-05
Journal Detail:
Title:  Human pathology     Volume:  41     ISSN:  1532-8392     ISO Abbreviation:  Hum. Pathol.     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2009-12-07     Completed Date:  2009-12-22     Revised Date:  2011-04-21    
Medline Journal Info:
Nlm Unique ID:  9421547     Medline TA:  Hum Pathol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  38-47     Citation Subset:  IM    
Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.
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MeSH Terms
Adenoma / genetics,  metabolism,  pathology*
Aged, 80 and over
Colonic Polyps / genetics,  metabolism,  pathology*
Colorectal Neoplasms / genetics,  metabolism,  pathology*
DNA Methylation*
Epigenesis, Genetic
Estrogen Receptor alpha / genetics,  metabolism
Genes, ras / genetics
Intestinal Mucosa / metabolism,  pathology*
Middle Aged
MyoD Protein / genetics,  metabolism
Precancerous Conditions / genetics,  metabolism,  pathology*
Reg. No./Substance:
0/Estrogen Receptor alpha; 0/MyoD Protein; 0/MyoD1 myogenic differentiation protein; 0/estrogen receptor alpha, human

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