Tokyo Scientists Discover Furtivovirus, Propose 1 New Viral Family as Giant Virus Breaks Down Cell Nucleus
Updated
Updated · ScienceAlert · May 27
Tokyo Scientists Discover Furtivovirus, Propose 1 New Viral Family as Giant Virus Breaks Down Cell Nucleus
4 articles · Updated · ScienceAlert · May 27
Tokyo University of Science researchers found furtivovirus in the Inasegawa River in Kamakura, identifying a giant virus that replicates by dismantling a host cell’s nucleus and using the remaining nucleoplasm.
That replication mode appears unlike other known giant viruses, which either reproduce inside an intact nucleus or destroy the nuclear membrane and replicate outside it.
Genomic analysis also suggests furtivovirus bridges two giant-virus lineages with sharply different genome sizes, leading the team to propose a new family, Manesviridae.
The Journal of Virology study says the virus offers a possible evolutionary intermediate for theories that giant viruses helped shape the origin of the eukaryotic nucleus, though it does not prove that hypothesis.
How does a new giant virus replicate by dissolving then hijacking the cell's nucleus?
Did a 'hidden' river virus just rewrite the origin story of complex life?
What other evolutionary secrets and potential risks are hiding in our planet's rivers?
Furtivovirus 2026: Discovery, Manesviridae Proposal, and the Viral Origins of the Eukaryotic Nucleus
Overview
In May 2026, researchers at the Tokyo University of Science discovered furtivovirus, a giant virus with a unique way of replicating. Unlike other viruses, furtivovirus starts by disrupting the host cell’s nuclear membrane and then produces new viral particles directly inside the nucleus. This novel replication strategy shows a new method of host cell manipulation among giant viruses. Based on these findings, scientists proposed a new viral family called Manesviridae, placing it as a sister group to Mamonoviridae and suggesting a broader classification for these related viruses. This discovery opens new paths for understanding viral evolution and diversity.