The cell nucleus is like a tent held up by internal poles. These poles, the lamin proteins, wear out with age, and the tent sags. For a long time scientists could not figure out who exactly keeps the poles intact and why they hold up longer in some people than in others.
The answer turned up in the genes of long-lived people. In centenarians from the Ashkenazi Jewish community, researchers found a rare variant of the UBE3C protein. This protein behaves like a guard at the entrance to the tent: it grabs the destroyers by the hand and does not let them near the lamins. In the lab, cells with this "reinforced guard" aged more slowly, while cells in which UBE3C was switched off aged twice as fast.
One detail makes the discovery especially important: UBE3C does not act through the usual pathway of tagging proteins for destruction. Instead, it blocks another process, the self-digestion of cellular components, which normally cleans the cell but with age starts burning through the needed poles. The key accomplice of the destroyers is the CKAP4 protein, which drags lamin B1 to the recycling plant. UBE3C stands in its way.
For now this is fundamental knowledge, not a drug. But scientists now have concrete targets: they can try to boost UBE3C or block CKAP4 so that the tent of the nucleus holds its shape longer. If that works, cell aging will slow down, and with it the diseases that aging drags along.
Among 1799 genes involved in protein degradation, 87% change their activity with age. This highlights just how deeply aging affects the protein quality control system.
The idea of a nuclear "guardian" that could be enhanced to prolong cellular youth echoes the concept of geroprotectors in Kim Stanley Robinson's novel Aurora, where gene therapy is used to slow aging in the generations aboard a starship.
Not published on arXiv. Here are its page, the PDF and the formalization: you can check it yourself, not only read our account.