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• W3047348770 abstract "<ns3:p><ns3:bold>Background:</ns3:bold>Gene silencing by CpG island hypermethylation often plays a role in colorectal cancer (CRC) progression. Certain regions of the genome, called high confidence differentially-methylated regions (DMRs), are consistently hypermethylated across numerous patient samples.</ns3:p><ns3:p><ns3:bold>Methods:</ns3:bold>In this study, we used bioinformatics and bisulfite PCR sequencing of HCT-116 cells to investigate methylation levels at DMRs in the promoters of six genes:<ns3:italic>DKK3, EN1, MiR34b, SDC2, SPG20</ns3:italic>, and<ns3:italic>TLX1</ns3:italic>. We then investigated whether the anti-cancer drug decitabine, had a demethylating effect at these promoter regions.</ns3:p><ns3:p><ns3:bold>Results:</ns3:bold>We found that hypermethylation correlated with lack of transcriptional enhancer binding in these six regions. Importantly, we observed that for all DMRs, decitabine significantly reduced CpG methylation. Decitabine also reduced clonogenic survival, suggesting that there is a correlation between lower CpG island methylation levels and reduced cancerous properties.</ns3:p><ns3:p><ns3:bold>Conclusions:</ns3:bold>Our study provided single-nucleotide resolution and revealed hypermethylated CpG sites not shown by previous genome-wide methylation studies. In the future, we plan to perform experiments that demonstrate a causal link between promoter hypermethylation and carcinogenesis and that more accurately model treatments in CRC patients.</ns3:p>" @default.
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• W3047348770 date "2020-08-04" @default.
• W3047348770 modified "2023-09-27" @default.
• W3047348770 title "Decitabine treatment demethylates vast majority of high-confidence differentially methylated regions in HCT-116 colorectal cancer cells" @default.
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• W3047348770 doi "https://doi.org/10.12688/f1000research.20442.1" @default.
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