A DNA methyltransferase transfers a methyl group to DNA, commonly using S-adenosylmethionine as donor. Different enzymes modify different bases or sequence contexts. Some preserve an existing pattern after DNA replication, whereas others establish new marks. Consequently, unchanged sequence can coexist with altered DNA methylation and gene regulation; the modification changes chemical information on the inherited template rather than necessarily changing its base order. [ref]
A methyltransferase recruited by RNA-directed DNA methylation that can establish methylation in multiple cytosine sequence contexts.
A plant chromomethylase contributing strongly to CHH methylation in heterochromatic regions.
This complements other plant methylation systems that act preferentially in different sequence or chromatin contexts. Separating CHH methylation from symmetric CG or CHG contexts is important because the patterns have different maintenance requirements after replication. [ref]
A plant chromomethylase important for CHG methylation and its coupling to H3K9 methylation.
Recognition of chromatin state helps couple DNA methylation to histone methylation, reinforcing a locally repressive environment. This is an interaction between two kinds of molecular mark, rather than conversion of one mark into the other. [ref]
Its activity helps copy a CG methylation pattern after DNA replication. Reduced MET1 function can therefore change heritable chromatin states while leaving the corresponding DNA base order unchanged; this separates an epigenetic mark from a sequence mutation. [ref]

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