Hypermethylation of the MLH1 promoter underlies most sporadic colorectal cancers with microsatellite instability (MSI). To investigate the role of hypermethylation in the normal colonic mucosa as a possible precursor lesion, we studied 700 bp upstream of MLH1 covering 51 CpG sites. We found partially methylated alleles in 15 of 34 (44%) patients <60 years of age and 20 of 24 (83%) patients > or =80 years of age (P = 0.0026). Fully methylated alleles were present in 18 of 33 (55%) patients with MSI+ tumors but in only 18 of 90 (20%) patients with MSI- tumors (P = 0.00019). By in situ analysis, methylation was patchy and located mainly in the cryptal regions close to the lumen. We conclude that the spread of methylation in the MLH1 promoter in the normal colonic mucosa is closely associated with age and the development of sporadic MSI+ colorectal cancers.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Exploration and Identification of Vitamin D and Related Genes as Potential Biomarkers for Colorectal Tumors.
Onco Targets Ther
January 2025
Tianjin Medical University, Tianjin Medical University General Hospital, Tianjin Institute of Digestive Disease, Tian Jin, People's Republic of China.
Objective: To explore the relationship and underlying mechanisms between vitamin D and CRC, offering valuable insights into the diagnosis and treatment of CRC.
Materials And Methods: Serum levels of 1,25(OH)D were measured using a double-antibody sandwich assay. Bioinformatics analysis identified vitamin D-related CRC genes, which were validated using HCT116 and HT29 cell lines.
The association between controlling nutritional status and postoperative pulmonary complications in patients with colorectal cancer.
Front Nutr
January 2025
Department of Intensive Care Unit, Biomedical Innovation Center, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
Background: Postoperative pulmonary complications (PPCs) significantly impact surgical outcomes, and Controlling Nutritional Status (CONUT) score, a simple and easily available nutritional score, has been demonstrated to be significantly associated with postoperative patient outcomes and complications, including PPCs. However, there are few studies that specifically focus on patients undergoing radical surgery for colorectal cancer (CRC).
Methods: We retrospectively analyzed the clinical data of 2,553 patients who underwent radical surgery for CRC at the Sixth Affiliated Hospital of Sun Yat-sen University.
EpigenPlot: An interactive web platform for DNA methylation-based biomarker and drug target discovery in colorectal cancer.
Br J Pharmacol
January 2025
Department of Bioinformatics, Semmelweis University, Budapest, Hungary.
Background And Purpose: Genome-wide methylation studies have significantly advanced our understanding of colorectal adenocarcinoma progression and biomarker discovery. Aberrant DNA methylation plays a crucial role in gene expression regulation during cancer transformation, highlighting the need to identify differentially methylated regions (DMRs) as potential diagnostic and therapeutic markers. However, an integrated resource to explore and validate methylation alterations across colorectal cancer stages has been lacking.
View Article and Find Full Text PDFCaspase-4 Has Potential Utility as a Colorectal Tissue Biomarker for Dysplasia and Early-Stage Cancer.
Gastro Hep Adv
September 2024
School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland.
Background And Aims: Colorectal cancer (CRC) is the second most deadly cancer globally. The rapidly rising incidence rate of CRC, coupled with increased diagnoses in individuals <50 years, indicates that early detection of CRC, and those at an increased risk of CRC development, is paramount to improve the survival rates of these patients. Here, we profile caspase-4 expression across 2 distinct CRC development pathways, sporadic CRC (sCRC) and inflammatory bowel disease-associated CRC (IBD-CRC), to examine its utility as a novel biomarker for CRC risk and diagnosis.
View Article and Find Full Text PDFNutraceutical Impact of Pumpkin Seed Oil on Expression Levels of EZH-2 and KRT-14 Genes against DSS-induced Inflammatory Bowel Disease in the Rat Model.
Cell Biochem Biophys
January 2025
Department of Food Science, Faculty of Agriculture, Zagazig University, Zagazig, 44519, Egypt.
Inflammatory bowel disease is a collection of intestinal disorders that cause inflammation in the digestive tract. Prolonged inflammation in the gastrointestinal tract is a major risk factor for colorectal cancer. The objective of this study was to fucus on gene expression levels of (KRT-14; associated with epithelial cell integrity) and enhancer of zeste homolog-1 (EZH-2; involved in cellular proliferation) in a IBD rat model in order to rule out impact of nutraceuticals (pumpkin seed oil; PSO) as a complementary approach to conventional treatments of IBD.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!