The name is one of those that run fast, because “zombie bacteria” is immediately remembered. This time, however, beneath the headline effect there is a scientific result that deserves attention. A group of researchers has shown that a bacterial cell that has been rendered inactive can be brought back into activity after receiving the complete DNA of another species. The study was released in March 2026 on bioRxiv, therefore as a preprint, and describes a living synthetic bacterial cell obtained through complete genomic transplantation.
The research moves within a field that for years has been trying to take a further step beyond simple genetic modification. Synthetic biology does not limit itself to adding or removing a gene: it aims to rewrite the functioning of a microorganism in a much more profound way, so as to transform it into a biological platform capable of producing useful substances, from drugs to biofuels. This is precisely the trajectory described for some time by the J. Craig Venter Institute, which links these studies to possible applications in medicine, energy, industrial chemistry and environmental remediation.
In the new experiment, the host cell remains there, but the command changes completely
The bacteria involved are Mycoplasma capricolum and Mycoplasma mycoides, two species that often return to this line of research. The researchers used the first as a recipient cell and transferred the complete genome of the second to it. From that moment the cell began to function again following the instructions of the new DNA. This is the passage that has sparked attention: the change does not concern a small correction, but the entire genetic system that governs cellular activity.
The image of the “zombie bacteria” comes from here. The cell is treated as inactive, then goes back to replicating under the control of a genome different from its own. Seen from the outside, the scene seems almost paradoxical. In the laboratory, however, the meaning is very concrete: the starting biological material can continue to function even after a radical replacement of the genetic instructions, as long as the cellular compatibility holds.
It is also worth keeping an important detail in mind. Researchers did not create life out of nothing. They worked on existing cells, intervening on their genetic heritage until they restarted with another program. It’s a distinction that the JCVI has been making clear for years when explaining these experiments: the goal is to replace or engineer genomes capable of directing the cell towards new functions.
This story starts from afar and passes through Craig Venter
Craig Venter’s name has been with this industry for a long time. In 2007 his group had already shown that transplanting the genome of one bacterium into another could cause a real change of species in the recipient cell. At the time the JCVI presented the result as the first bacterial genome transplant capable of transforming one type of bacterium into another driven by the transplanted chromosome, while Nature spoke of a “species switch”.
Three years later another key step arrived: the publication on Science of the first bacterial cell controlled by a synthetic genome chemically constructed in the laboratory. Even in that case the heart of the experiment lay in the transfer of a new genetic program into a recipient cell, which from then on changed its behavior and biological identity.
The new study is part of this path, but makes even more evident a possibility that has been pursued for decades: treating the microorganism as a living factory to be designed according to a purpose. Medicines, vaccines, alternative fuels, industrial molecules, systems for clean water or for the degradation of certain pollutants are among the applications cited most often by institutions working in this field.
For now, caution is needed, because the work is still a preprint and will have to go through verification and review by the scientific community. The signal, however, is clear. When a bacterial cell becomes active again with the DNA of another species, synthetic biology stops seeming like a distant promise and takes the form of something very small, very concrete, already inside a laboratory capsule.
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