Quick answer
DNA methylation: definition
DNA methylation is the addition of methyl groups to DNA — usually at cytosine bases — which helps regulate whether genes are switched on or off without changing the DNA sequence.
DNA methylation, explained
It's a primary epigenetic mechanism and helps give each cell type its identity. DNA methylation patterns change with age, which is the basis of epigenetic clocks.
Why it matters
DNA methylation connects nutrition, lifestyle and aging — and is central to biological age testing.
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DNA methylation FAQs
What is DNA methylation?
Why does DNA methylation matter?
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