Imagine a single gene that could push aged cells back toward a younger state, without the risky side effects of earlier “rejuvenation” tricks.
A team led by George Church at Harvard’s Wyss Institute and Antonio del Sol at CIC bioGUNE says they may have found one. It’s called SRSF1, and the results were published in Nature Aging on 14 October 2026.
How did they find it?
Cells have a molecular “age” that scientists can read from which genes are switched on and off. The team built a computer model that estimates this age in human skin cells (fibroblasts) and, importantly, shows why it gives a certain answer. Then they tested a large set of genes to see which ones could make old cells look and behave younger.
What is SRSF1?
SRSF1 helps cells edit their genetic instructions, a process called splicing. Think of it as an editor that cuts and arranges a draft into a final text. When the team boosted its activity in old cells, several signs of ageing eased:
- Fewer “senescent” cells. These are worn-out cells that stop dividing but don’t go away.
- Less inflammation. Ageing cells often send out chronic, harmful alarm signals.
- Less cellular stress. The cells handled their proteins better.
Why is this different?
Earlier rejuvenation methods use so-called Yamanaka factors, which can wind cells back so far that they forget what they are. That raises safety worries, including the risk of tumours. SRSF1 appears to avoid this: the skin cells stayed skin cells.
What happened in animals?
In old mice, switching on SRSF1 slowed the growth of frailty by 44% and was linked to a 14% longer median lifespan. Effects on lifespan were also seen in worms.
The big caveats
- Very small groups. Only 9 to 10 mice per group were followed for survival, so the lifespan result needs to be repeated in bigger studies.
- No human evidence yet. Nobody has tested this in people, and mouse results often don’t carry over.
The bottom line
SRSF1 is an exciting lead, not a treatment. It suggests some parts of ageing may be reversed without erasing a cell’s identity, which is the main safety worry of older approaches. But this is early lab science, and any therapy for people would be many years away.
This article is general information, not medical advice.
Source:
https://www.nature.com/articles/s43587-026-01234-8
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