University of Minnesota researchers say they have built a synthetic cell called SpudCell that can grow, divide and transmit traits to descendant compartments under controlled laboratory conditions. The work is described in a bioRxiv preprint and has not been peer reviewed.
The team frames SpudCell as a step toward constructing life-like systems from nonliving parts, while emphasizing clear technical limits and biosafety considerations. The report presents experiments that couple genome-encoded processes to physical growth, division and selection in a constructed system.
What the team reported
The University of Minnesota group posted a preprint on bioRxiv describing SpudCell, a cell-like assembly built from chemically defined components rather than derived from a living cell. According to the preprint, the system encodes a roughly 90,000-base-pair genome that directs core functions including protein production and DNA replication.
Researchers report that SpudCell exhibits multiple behaviors associated with living cells: it increases in size as it produces macromolecules, it copies its synthetic genome, physical compartments divide, and variants with advantageous changes can increase in frequency over successive rounds of growth and division. The authors present these observations as demonstration of growth, replication and a basic form of heredity in a synthetic platform.
How SpudCell synthetic cell works
At its core SpudCell contains a synthetic genome of about 90,000 base pairs that encodes the molecular functions needed for protein synthesis and DNA replication. The experimental system is assembled from purified, nonliving molecular parts and encapsulated in compartments that serve as cell-like environments.
Critically, SpudCell depends on externally supplied nutrients and specialized reagents. The researchers supplied ribosomes purified from Escherichia coli to translate the synthetic genome’s instructions into proteins, along with energy sources and other purified factors. That reliance on borrowed bacterial machinery and laboratory reagents is a defined constraint noted throughout the preprint.
Growth, heredity and experimental results
In the reported experiments the team introduced a mutation that produced a faster-growing SpudCell variant. Across repeated cycles of growth and division, the faster variant produced more offspring compartments and became more common, demonstrating selection operating on genetically encoded differences within the synthetic system.
The authors also measured how well the synthetic genome is transmitted to daughter compartments. After five rounds of division, roughly 30% of descendant compartments retained a complete synthetic genome, indicating that genome segregation is imperfect and that many daughter compartments are genome-deficient under current conditions.
The paper frames these results as an important demonstration that growth, replication and a selectable benefit can be linked in a constructed system, while also emphasizing that the system is not equivalent to naturally evolved cells and remains limited in stability and autonomy.
Limits and safety concerns
The researchers are explicit about the system’s limits: SpudCell is not self-sustaining, it cannot regenerate the full set of molecular machinery internally, and it requires controlled laboratory conditions and purified components to operate. The dependence on E. coli ribosomes and other exogenous reagents means SpudCell cannot function outside carefully managed experimental setups.
Because the findings appear in a bioRxiv preprint, they have not been through peer review and independent verification of performance claims is pending. The authors and the preprint note this status and caution that replication by other groups and further validation will be needed.
The paper also discusses biosafety and biosecurity implications. The researchers argue that while the current system poses limited direct risks because it is nonautonomous and reagent-dependent, increasing capability in synthetic cell engineering will require robust containment practices, oversight and a developing safety framework to guide future work.
Why this matters and next steps
SpudCell illustrates how researchers can assemble multiple hallmarks of cellular behavior from defined parts, creating a platform to study fundamental questions about the origins of life-like behavior and to prototype engineered functions. Even without autonomy, a programmable, evolvable platform could be useful for basic research and for producing tailored biochemical activities in laboratory contexts.
The authors identify priorities for future work: making more molecular machinery self-generated within the system, improving the fidelity of genome partitioning during division, and enabling mutations to arise and be selected without manual intervention. Progress on those aims would increase the system’s evolvability and utility but would also heighten the importance of containment, governance and risk assessment.
FAQ
Is SpudCell a living organism?
The team does not claim that SpudCell is a living organism in the conventional sense. It exhibits features such as growth, DNA replication and division, but it depends on externally supplied parts and energy and lacks the autonomy of naturally living cells.
Could SpudCell survive outside the lab?
No. According to the preprint, SpudCell requires controlled lab conditions, purified reagents and ribosomes taken from bacteria. It is not self-sustaining or viable in real-world environments as reported.
What are the main technical limits of SpudCell?
Main limits include dependence on external nutrients and purified components, reliance on bacterial ribosomes, imperfect genome inheritance (about 30% retention after five generations) and the current need for researcher intervention to introduce mutations. These constraints prevent autonomy and reduce environmental risk in the present system.
Source attribution
Original reporting by Fox News Digital. Preprint posted on bioRxiv. Research led by the University of Minnesota.
Next steps for independent verification include peer review of the preprint, replication by other labs, and further experiments to improve genome stability and internal regeneration of molecular machinery. The authors recommend continued attention to biosafety frameworks as capability increases.
