Targeted methylation of cytosine residues by S-adenosylmethionine–dependent DNA methyltransferases modulates gene expression in vertebrates. Here we show that cytosine-5-methyltransferases catalyze ...
Chemical structure of guanine, showing its double-ring purine structure and the functional groups involved in hydrogen bonding with cytosine. (Image: Public Domain) Guanine has the chemical formula ...
DNA methylation is a fundamental epigenetic mechanism in which a methyl group is added onto a nucleotide, commonly cytosine. DNA methylation affects many biological processes, including gene ...
The DNA base cytosine has a lot of different outfits in its closet. Most famously, the base can slip on a methyl group at its fifth carbon, a change that lends cytosine the ability to silence genes.
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