<u>Cytosine base</u> is methylated in DNA methylation.
A biological process called DNA methylation involves the addition of methyl groups to the DNA molecule.
Without altering the sequence, methylation can modify the activity of a DNA region.
DNA methylation often suppresses gene transcription when it occurs at a gene promoter.
DNA methylation is the process of adding a methyl group to DNA, further altering gene function and impacting gene expression.
Cytosine and adenine, two of the four bases in DNA, are the bases that can be methylated.
The most frequent DNA methylation in humans is the covalent attachment of a methyl group to the fifth carbon of the cytosine ring, producing the product 5-methylcytosine.
