Epic / Epigenetics (broader concept)

Epigenetics is the study of changes in gene activity that don't involve changes to the DNA sequence itself. Think of your DNA as a piano — the keys (genes) are always there. Epigenetics is like the sheet music — it tells the piano which notes to play and which to skip. The same piano, different music, depending on the epigenetic "sheet music." Three main epigenetic mechanisms: 1. DNA methylation (the "highlighter marks" — described above) 2. Histone modification — wrapping DNA around protein spools; looser wrapping = more active genes 3. Non-coding RNA — RNA molecules that regulate other genes In MHS: The episignature is one type of epigenetic biomarker. The broader field of epigenetics matters because it means there might be treatments that modify gene activity without changing the DNA sequence itself — potentially a gentler approach than gene therapy.