CAHM, a long non-coding RNA gene hypermethylated in colorectal neoplasia
| Autor: | Jason P. Ross, Melissa L. Thomas, Susan M. Mitchell, Thu Ho, Graeme P. Young, Zheng-Zhou Xu, Rohan Baker, Susanne K. Pedersen, Aidan McEvoy, Peter L. Molloy, Lloyd D. Graham, Lawrence C. LaPointe |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Adenoma
Adult Male Cancer Research Bisulfite sequencing Molecular Sequence Data Biology Adenocarcinoma Gene expression medicine Genetics Biomarkers Tumor Humans CAHM gene (LOC100526820) Molecular Biology Gene Aged Neoplasm Staging DNA methylation QKI Base Sequence Intron RNA Cancer Methylation Biomarker circulating DNA Middle Aged medicine.disease Molecular biology Long non-coding RNA Female RNA Long Noncoding Caco-2 Cells Colorectal Neoplasms colorectal neoplasia Research Paper |
| Zdroj: | Epigenetics |
| ISSN: | 1559-2308 1559-2294 1005-2682 |
| Popis: | Copyright © 2014 Landes Bioscience This is an open-access article licensed under a Creative Commons Attribution 3.0 Unported License. The article may be redistributed, reproduced, and reused for non-commercial purposes, provided the original source is properly cited. Permission is granted subject to the terms of the License under which the work was published. Please check the License conditions for the work which you wish to reuse. Full and appropriate attribution must be given. This permission does not cover any third party copyrighted material which may appear in the work requested. The CAHM gene (Colorectal Adenocarcinoma HyperMethylated), previously LOC 100526820, is located on chromosome 6, hg19 chr6:163 834 097–163 834 982. It lacks introns, encodes a long non-coding RNA (lncRNA) and is located adjacent to the gene QKI, which encodes an RNA binding protein. Deep bisulphite sequencing of ten colorectal cancer (CRC ) and matched normal tissues demonstrated frequent hypermethylation within the CAHM gene in cancer. A quantitative methylation-specific PCR (qMSP ) was used to characterize additional tissue samples. With a threshold of 5% methylation, the CAHM assay was positive in 2/26 normal colorectal tissues (8%), 17/21 adenomas (81%), and 56/79 CRC samples (71%). A reverse transcriptase-qPCR assay showed that CAHM RNA levels correlated negatively with CAHM % methylation, and therefore CAHM gene expression is typically decreased in CRC . The CAHM qMSP assay was applied to DNA isolated from plasma specimens from 220 colonoscopy-examined patients. Using a threshold of 3 pg methylated genomic DNA per mL plasma, methylated CAHM sequences were detected in the plasma DNA of 40/73 (55%) of CRC patients compared with 3/73 (4%) from subjects with adenomas and 5/74 (7%) from subjects without neoplasia. Both the frequency of detection and the amount of methylated CAHM DNA released into plasma increased with increasing cancer stage. Methylated CAHM DNA shows promise as a plasma biomarker for use in screening for CRC . |
| Databáze: | OpenAIRE |
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