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Analyzing Aberrant DNA Methylation in Colorectal Cancer Uncovered Intangible Heterogeneity of Gene Effects in the Survival Time of Patients

Overview
Journal Res Sq
Date 2023 Jul 3
PMID 37397988
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Abstract

Colorectal cancer (CRC) involves epigenetic alterations. Irregular gene-methylation alteration causes and advances CRC tumor growth. Detecting differentially methylated genes (DMGs) in CRC and patient survival time paves the way to early cancer detection and prognosis. However, CRC data including survival times are heterogeneous. Almost all studies tend to ignore the heterogeneity of DMG effects on survival. To this end, we utilized a sparse estimation method in the finite mixture of accelerated failure time (AFT) regression models to capture such heterogeneity. We analyzed a dataset of CRC and normal colon tissues and identified 3,406 DMGs. Analysis of overlapped DMGs with several Gene Expression Omnibus datasets led to 917 hypo- and 654 hyper-methylated DMGs. CRC pathways were revealed via gene ontology enrichment. Hub genes were selected based on Protein-Protein-Interaction network including , , , , and , regulating the Wnt signaling pathway. The relationship between identified DMGs/hub genes and patient survival time uncovered a two-component mixture of AFT regression model. The genes , , , , , , and and hub genes , , and were associated with survival time in the most aggressive form of the disease that can serve as potential diagnostic targets for early CRC detection.

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