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13 May 2019 : Clinical Research

Impact of Colon-Specific DNA Methylation-Regulated Gene Modules on Colorectal Cancer Patient Survival

Haitao Yu1BCDE, Wei Jiang2BC, Gang Chen2CD, Fan Yang1DE, Xingwang Zhao1EF, Zhiwu Ji1CE, Jian Ni1CE, Yan Fu1CE, Fujun Chen1ABEF*, Bin Zhao1A

DOI: 10.12659/MSM.916181

Med Sci Monit 2019; 25:3549-3557

Abstract

BACKGROUND: Colorectal cancer (CRC) is the second most commonly diagnosed cancer in females and the third in males worldwide. Although existing evidence explained some critical functions of the single genetic abnormality in the pathogenesis of CRC, the function of interactors involved in the colon-specific regulatory network, especially DNA methylation regulated network is still poorly understood.

MATERIAL AND METHODS: In this work, matched gene expression and DNA methylation samples of CRC patients were retrieved. Differential gene expression and methylation analyses were performed. In addition, gene expression and DNA methylation were integrated into a colon-specific regulatory gene network, detecting the epigenetically regulated gene modules which drive CRC through an underlying epigenetic mechanism. Finally, the colon-specific DNA methylation-regulated gene modules were validated using an independent set of CRC patients.

RESULTS: Differential gene expression analysis demonstrated the upregulation of the cell cycle and DNA replication and downregulation of cGMP-PKG signaling pathway and calcium signaling pathway in CRC. Differentially methylated regions (DMRs) showed the different levels of methylation in promoters, CpG islands, and genes in CRC. In addition, gene expression and DNA methylation were integrated into a colon-specific regulatory gene network, detecting 8 epigenetically regulated gene modules which drive CRC through an underlying epigenetic mechanism. Interestingly, 2 of the colon-specific DNA methylation-regulated gene modules showed a significant predictive ability for the survival of an independent set of CRC patients.

CONCLUSIONS: The results of this study could open a new era and aid the development of novel therapeutic targets for the treatment of CRC patient.

Keywords: Colorectal Neoplasms, DNA Methylation, Gene Expression, Organ Specificity, Survival Analysis

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750