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- W4312202007 abstract "Abstract N 6 -deoxyadenosine methylation (6mA) is the most widespread type of DNA modification in prokaryotes and is also abundantly distributed in some unicellular eukaryotes. However, 6mA levels are remarkably low in mammals. The lack of a precise and comprehensive mapping method has hindered more advanced investigations of 6mA. Here, we report a new method MM-seq (modification-induced mismatch sequencing) for genome-wide 6mA mapping based on a novel detection principle. We found that modified DNA bases are prone to form a local open region that allows capture by antibody, for example, via a DNA breathing or base-flipping mechanism. Specified endonuclease or exonuclease can recognize the antibody-stabilized mismatch-like structure and mark the exact modified sites for sequencing readout. Using this method, we examined the genomic positions of 6mA in bacteria ( E. coli ), green algae ( C. reinhardtii ), and mammalian cells (HEK239T, Huh7, and HeLa cells). In contrast to bacteria and green algae, human cells possess a very limited number of 6mA sites which are sporadically distributed across the genome of different cell types. After knocking out the RNA m 6 A methyltransferase METTL3 in mouse ES cells, 6mA becomes mostly diminished. Our results imply that rare 6mA in the mammalian genome is introduced by RNA m 6 A machinery via a non-targeted mechanism." @default.
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- W4312202007 date "2022-12-27" @default.
- W4312202007 modified "2023-10-15" @default.
- W4312202007 title "High-precision mapping reveals rare N6-deoxyadenosine methylation in the mammalian genome" @default.
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- W4312202007 doi "https://doi.org/10.1038/s41421-022-00484-1" @default.
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