Loss of cell identity drives human aging, say new Nature and Cell papers
EricTopol · x · 2026-10-01
Eric Topol breaks down two new aging studies — one in Nature from Vadim Gladyshev's Harvard team and one in Cell from Juan Carlos Izpisua Belmonte's Altos Labs group — proposing a "loss of cell identity" model of aging.
Key points:
- Beyond the classic "wear and tear" damage model, aging is framed as cells drifting from the identity locked in during embryonic development, with epigenetic structure (methylation, histones, 3D chromatin) underlying biological age clocks.
- A three-tier regulatory "grammar" maintains identity, including a fast layer responding to acute stress via transcription factors like AP-1.
- Identity loss drives "mesenchymal drift" — fibrotic scarring and inflammation — and is also linked to cancer.
- The relative contribution of the two aging models remains unknown, but the new framework suggests intervention targets.
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