DNA methylation of shelf, shore and open sea CpG positions distinguish high microsatellite instability from low or stable microsatellite status colon cancer stem cells.
Di Franco, S
Di Marco, M
De Laurenzi, V
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<b>Aim:</b> To investigate the genome-wide methylation of genetically characterized colorectal cancer stem cell (CR-CSC) lines. <b>Materials & methods:</b> Eight CR-CSC lines were isolated from primary colorectal cancer (CRC) tissues, cultured and characterized for aneuploidy, mutational status of CRC-related genes and microsatellite instability (MSI). Genome-wide DNA methylation was assessed by MethylationEPIC microarray. <b>Results:</b> We describe a distinctive methylation pattern that is maintained following <i>in vivo</i> passages in immune-compromised mice. We identified an epigenetic CR-CSC signature associated with MSI. We noticed that the preponderance of the differentially methylated positions do not reside at CpG islands, but spread to shelf and open sea regions. <b>Conclusion:</b> Given that CRCs with MSI-high status have a lower metastatic potential, the identification of a MSI-related methylation signature could provide new insights and possible targets into metastatic CRC.
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Drug Resistance, Neoplasm
Neoplastic Stem Cells
Gastrointestinal Cancer Biology and Genomics
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Epigenomics, 2019, 11 (6), pp. 587 - 604