Scientists Discover a Human Brain Gene That Can Jump Through DNA and Has Turned Up in a Virus

Scientists have discovered a human gene with an unusual ability that has survived millions of years of evolution. Known as BC200, the gene is associated with brain cells, yet it can still jump through genetic material and insert copies of itself into new locations. Even more surprisingly, researchers have found BC200 sequences inside a virus that infects human skin, raising questions about how genetic material moves between organisms and what this strange behavior could mean for human biology.

The discovery, published in the journal Science on September 24, 2026, has revealed a combination of genetic properties scientists had not previously identified together in a human gene. BC200 evolved from an ancient mobile genetic element, commonly called a jumping gene, but it appears to have retained that mobility while developing a role in cellular function. Researchers are now investigating whether its unusual behavior could influence the way viruses interact with human cells and whether it has any connection to diseases such as cancer and Alzheimer’s.

Scientists Discover a Gene With Two Unexpected Abilities

Researchers at Cornell University identified the unusual properties of BC200 while investigating human genetic material found inside molluscum contagiosum virus, a member of the poxvirus family. Their analysis revealed that the genetic element was capable of moving through genomes while also serving a biological function in human cells. This combination is unusual because mobile genetic elements that become useful to an organism typically lose their ability to move over evolutionary time.

BC200 is a non-coding RNA gene, meaning it produces an RNA molecule rather than providing instructions for building a protein. The gene is expressed mainly in neurons, the specialized cells responsible for transmitting information throughout the brain and nervous system. Evidence suggests BC200 may help regulate how messenger RNA molecules are translated into proteins, although its precise physiological role remains uncertain.

Cedric Feschotte, a senior author of the study, described the unusual combination of properties in the Cornell research report. “BC200 was itself created from a mobile element but has retained its mobility and yet it is also clearly serving a cellular function. Somehow evolution hasn’t been able to untangle these two things.” The finding suggests that BC200 has retained an ancient genetic ability even after acquiring a role in human biology.

The researchers also found evidence that BC200 has continued producing new insertions throughout primate evolution. Some of these insertions appear to be specific to particular evolutionary lineages or individual humans, suggesting that the process may still be active. Scientists are now trying to determine how frequently these genetic movements occur and whether they have any measurable effects on the cells carrying them.

What Makes Jumping Genes So Unusual?

Jumping genes, scientifically known as transposable elements or transposons, are stretches of genetic material that can move to new locations within a genome. Some achieve this by cutting themselves out of one location and inserting themselves elsewhere, while others create copies that can be inserted into new positions. These movements can introduce changes into DNA, sometimes disrupting existing genes or altering the way nearby genes operate.

The effects of transposons depend on where their genetic material lands. An insertion can have little noticeable impact, but it can also interfere with normal cellular activity if it disrupts an important sequence. Scientists have linked the activity of some mobile genetic elements to mutations and disease, although not every insertion is harmful and many have no obvious effect on an organism.

Despite their potential risks, transposons have played an important role in evolution. Over millions of years, genetic sequences derived from these mobile elements have been repurposed for useful biological functions. Some have contributed to the regulation of existing genes, while others have provided raw material for entirely new genetic functions. Their evolutionary influence is substantial, with approximately half of the human genome consisting of DNA derived from transposable elements and related sequences.

Most of these ancient elements can no longer move independently because they have accumulated mutations or lost the machinery needed for their movement. BC200 is unusual because it appears to have retained this ability while becoming associated with neuronal function. The discovery offers researchers a rare opportunity to study how mobile genetic material can continue moving after becoming integrated into the ordinary biological processes of its host.

How a Human Brain Gene Ended Up Inside a Virus

The most unexpected part of the discovery involves molluscum contagiosum virus, a poxvirus that infects human skin and causes small, raised bumps. Researchers identified two insertions of BC200-related genetic material within the viral genome, suggesting that genetic material associated with humans had entered the virus. The findings provide evidence of an unusual movement of genetic sequences between human cells and a virus.

The researchers suspect the transfer may have occurred while the virus was infecting skin cells. Molluscum contagiosum virus is known to infect human skin, making those cells a plausible setting for the transfer. However, scientists have not directly observed the historical event, and further research is needed to establish precisely how the genetic material entered the viral genome.

The discovery is especially striking because BC200 is primarily associated with neurons, while the virus infects skin cells. The presence of the gene’s sequences inside the virus does not mean the virus can enter the brain, nor does it establish that BC200 causes an infection or makes the virus more dangerous. Instead, the finding raises questions about how mobile genetic elements can move between genetic environments and whether the acquired sequences have any biological function inside the virus.

Researchers have documented other examples of mobile genetic elements entering viruses, including an earlier observation involving a transposon moving from cultured moth cells into a baculovirus. The BC200 finding adds a distinctive human example to this area of research. Scientists now want to determine whether the genetic material is simply carried by the virus or whether it affects how the virus interacts with the human cells it infects.

Could BC200 Create Genetic Changes in Future Generations?

BC200’s mobility may have implications beyond the cells in which it is currently active. Researchers found that the gene is also expressed at low levels in germ cells, including sperm and eggs. This raises the possibility that some new insertions could occur in cells that contribute genetic material to the next generation, potentially allowing those changes to be inherited.

For an insertion to pass to future generations, it must occur in the appropriate cellular context and become part of the genetic material that contributes to reproduction. The presence of BC200 in germ cells does not mean that every new insertion will be inherited, and it does not establish that such changes are necessarily harmful. Their effects would depend on where the genetic material is inserted and how it interacts with existing sequences.

If an insertion disrupts a functioning gene or changes its regulation, it could potentially alter a biological process. Other insertions might have little effect or contribute to genetic variation without producing an obvious disadvantage. Over long periods, such changes can influence the evolution of populations, which is one reason scientists study the behavior of mobile genetic elements.

The researchers’ findings suggest that BC200 has continued generating insertions across primate evolution, but many questions remain about its activity in living humans. Further studies will be needed to establish how often new insertions occur, which cells are most affected, and whether the process has consequences for health. The discovery provides evidence of an unusual genetic mechanism, but it does not mean that widespread harmful mutations are occurring in the human population.

Scientists Are Investigating Possible Links to Cancer and Alzheimer’s

BC200 has already attracted scientific interest because researchers have observed abnormal expression of the gene in some tumors and elevated levels in the brains of people with Alzheimer’s disease. These findings have raised questions about whether the gene’s activity might be associated with changes that occur in certain diseases. However, elevated gene expression alone cannot establish that BC200 causes either condition.

Genes can become more active as a consequence of disease, rather than acting as the original cause. To determine whether BC200 contributes to disease development, researchers must establish what the gene is doing in affected cells and whether its movement through DNA produces meaningful changes. This distinction is especially important when studying complex conditions such as cancer and Alzheimer’s disease, which involve multiple biological processes.

The research team is particularly interested in finding out whether BC200 is actively jumping in cancer cells and whether its insertions can create mutations. If the gene remains mobile in those cells, researchers will need to determine whether new insertions disrupt other genes or alter the regulation of important cellular functions. Such findings could clarify whether BC200 is simply associated with certain tumors or plays a more direct role in their development.

The researchers also plan to investigate whether molluscum contagiosum virus uses BC200 to manipulate infected human cells. At present, there is no established evidence that the virus benefits from carrying the gene, and the implications of its presence remain uncertain. These investigations could help explain why the genetic material entered the viral genome and whether its continued mobility has consequences for human cells.

What Researchers Still Need to Find Out

The discovery has opened several lines of investigation into BC200 and its unusual evolutionary history. Scientists want to establish how frequently the gene generates new insertions, whether those movements occur in particular cell types, and what happens when a new copy appears in a different location. Answering these questions will help distinguish the gene’s established biological properties from possible consequences that have not yet been demonstrated.

Researchers must also determine whether the BC200 sequences found inside molluscum contagiosum virus are active and whether they influence viral behavior. The discovery of genetic material inside a virus is evidence of an unusual genetic event, but it does not automatically mean the sequence provides a benefit to the virus or changes the severity of an infection. Laboratory investigations will be needed to test those possibilities.

The possible connections to cancer and Alzheimer’s disease require equally careful examination. Scientists need to determine whether BC200’s mobility contributes to genetic changes in affected cells or whether abnormal expression occurs alongside other disease-related processes. Until those questions are answered, the gene should not be considered a confirmed cause of either condition.

BC200 offers a striking example of how evolution can preserve an ancient genetic ability while a sequence acquires a role in human biology. Its discovery inside a human virus has revealed another unexpected dimension of mobile DNA, giving researchers new questions to investigate about genetic change, viral interactions, and the origins of disease. The next stage of research will determine whether this unusual gene’s ability to move through DNA has consequences beyond the evolutionary record.