The animals that break the rules
Vera Gorbunova studies the species that should not work. The naked mole-rat is a rodent the size of a mouse that lives roughly ten times longer, and barely gets cancer. The bowhead whale is the longest-lived mammal on earth, passing two hundred years. Her question is simple to state and hard to answer: what do they have that we don’t?
Her first conclusion is uncomfortable for the lifestyle end of the field. Within a species, environment matters — one human lives to seventy, another to ninety. But between species it is overwhelmingly genetic. It does not matter how perfect the conditions you give a mouse; it will never live as long as a naked mole-rat.
Which is why her laboratory did something rather bold: they took the naked mole-rat’s gene for producing hyaluronic acid and put it into mice. Those mice lived about ten percent longer. She is careful about why the number isn’t larger — a naked mole-rat carries perhaps ten times more hyaluronic acid in its tissues than a mouse or a human, and her transgenic mice managed barely a twofold increase. One gene, partially expressed, and it still moved lifespan.
Hyaluronic acid also slows cancer and metastasis, which is likely how it reaches people first. Not approved for longevity — that pathway is long — but as part of an anti-cancer therapy, which she thinks is achievable within about five years.
Her other line of work is where the RLE label really earns itself. Most reprogramming uses pioneer factors that push a cell back toward an embryonic state, with all the risk that carries. She works instead with SIRT6, which is not a pioneer factor: it doesn’t change what the cell is. An old liver cell has chromatin that has come loose; SIRT6 tightens it just enough that it becomes a young liver cell — not a kidney cell, not an embryo. Rejuvenation without loss of identity.
