In 2010, a scientist named Cheng Sun was searching through viral genomes when he found something that didn’t belong.
A piece of human genetic material had apparently made its way into a virus.
Not just any piece, either.
It came from a gene called BC200, which is particularly active in the brain.
The researchers knew they’d found something unusual.
And then, for reasons that aren’t entirely clear, they didn’t publish it.
Sixteen years went by.
I love stories like this.
We tend to imagine scientific discoveries as dramatic moments. Somebody looks through a microscope, shouts for a colleague, and the world changes.
But sometimes a discovery just sits there.
Waiting.
A rather strange gene
To understand what these scientists found, we need to talk about jumping genes.
Yes, that’s actually what they’re called.
They’re pieces of genetic material that can copy themselves and insert those copies into new locations in DNA.
And they’re not some obscure little curiosity.
Nearly half of the human genome consists of DNA derived from these mobile elements, although most of them lost their ability to move long ago.
Over millions of years, some jumping genes have been recruited for useful jobs in the body.
Usually, when that happens, they settle down.
They stop jumping.
BC200 apparently didn’t get that memo.
This gene evolved from a mobile genetic element roughly 40 million years ago. It’s particularly active in neurons, where researchers believe it helps regulate protein production.
Its precise function is still being investigated.
But here’s the peculiar part.
Even after acquiring a job in our cells, BC200 retained the ability to produce copies that insert themselves elsewhere in the genome.
And apparently, some of those copies managed to escape into a virus.
A human poxvirus, to be precise. One called molluscum contagiosum virus, which causes small bumps on the skin.
The scientists found evidence of two separate insertions.
It’s not something you’d expect to discover while examining a virus.
But there it was.
Sixteen years later
Cedric Feschotte, one of the researchers involved in the original discovery, eventually moved to Cornell University.
Cheng Sun continued his scientific career in China.
Then they met again at a conference.
Sun mentioned that he and his graduate student, Pu Gao, had gone back to the old project.
The research had taken on new life.
And the findings were even more interesting than they’d realized in 2010.
The team discovered evidence that BC200 had continued producing new insertions throughout primate evolution.
They even found differences between individual human genomes suggesting that the process hasn’t stopped.
In September 2026, the researchers finally published their findings in Science.
Feschotte told Cornell’s news service he was amazed nobody else had beaten them to it.
Sixteen years.
That’s a long time to leave an interesting discovery sitting around.
What else is sitting there?
There’s something I find particularly appealing about this story.
These scientists didn’t necessarily need an entirely new discovery.
They needed to return to an old one.
With more knowledge, new tools, and perhaps a different perspective, something they’d noticed years earlier became much more significant.
I wonder how often that happens outside science.
How many things have we noticed, wondered about, and then set aside because we didn’t know what to do with them?
How many old questions might be worth another look?
I don’t know.
But I like imagining that somewhere, in a notebook or on an old computer, there’s another discovery waiting for somebody to come back and ask a better question.
And I particularly like that this one involves a jumping gene that apparently refuses to settle down.
Sixteen years later, it was still causing trouble.
The research
Gao P., Pritham E.J., Feschotte C., and Sun C. Escape of the BC200 gene to a human poxvirus reveals its persistent transposition in primates. Science, September 24, 2026.
https://doi.org/10.1126/science.aeh3441
The story behind the discovery
Cornell Chronicle, September 24, 2026.
https://news.cornell.edu/stories/2026/09/new-type-human-jumping-gene-found-poxvirus