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• W2893849467 abstract "Control of DNA methylation level is critical for gene regulation, and the factors that govern hypomethylation at CpG islands (CGIs) are still being uncovered. Here, we provide evidence that G-quadruplex (G4) DNA secondary structures are genomic features that influence methylation at CGIs. We show that the presence of G4 structure is tightly associated with CGI hypomethylation in the human genome. Surprisingly, we find that these G4 sites are enriched for DNA methyltransferase 1 (DNMT1) occupancy, which is consistent with our biophysical observations that DNMT1 exhibits higher binding affinity for G4s as compared to duplex, hemi-methylated, or single-stranded DNA. The biochemical assays also show that the G4 structure itself, rather than sequence, inhibits DNMT1 enzymatic activity. Based on these data, we propose that G4 formation sequesters DNMT1 thereby protecting certain CGIs from methylation and inhibiting local methylation." @default.
• W2893849467 created "2018-10-05" @default.
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• W2893849467 date "2018-10-01" @default.
• W2893849467 modified "2023-10-16" @default.
• W2893849467 title "DNA G-quadruplex structures mold the DNA methylome" @default.
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• W2893849467 doi "https://doi.org/10.1038/s41594-018-0131-8" @default.
• W2893849467 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6173298" @default.
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• W2893849467 hasPublicationYear "2018" @default.
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