Life on Earth 101: The Genetics of Aging, Identity, and Everything In Between
7 hours ago
- Genetics is not static. Contrary to popular belief that our DNA “never changes,” Park explains that copying errors accumulate over a lifetime (genetic drift) — like a photocopy of a photocopy gradually degrading.
- Epigenetics is the real software layer. Genes themselves matter less than which ones get switched on or off (via methylation and acetylation) — explaining why a heart cell and a brain cell share identical DNA yet function completely differently, and why humans and chimps can share 98% of their genes yet look nothing alike.
- Aging is a story of cellular depletion, not just mutation. Using the “lint trap” analogy, Park frames aging as a gradual loss of stem cell reserve and immune flexibility — illustrated by the case of a Dutch supercentenarian whose immune system had only two clonal variants left, versus the ~10,000 a healthy person carries.
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