A machine that mimics life rather than a living thing
In a laboratory at the University of Minnesota, scientists have assembled a synthetic cell called SpudCell from nonliving chemical components — one that grows, divides, replicates its genome, and even undergoes natural selection. It is not life as nature made it, but it performs the essential acts of living, raising one of the oldest questions in a new form: where does chemistry end and life begin? The achievement is as much a philosophical threshold as a scientific one, and the researchers themselves are among the first to ask whether humanity is prepared for what comes next.
- SpudCell can grow, copy its genome, divide, and compete — behaviors that define life — yet it was assembled entirely from chemicals, never born from a living ancestor.
- The system remains fragile and lab-dependent: only 30% of daughter cells inherit the full synthetic genome after five generations, and it cannot survive without borrowed bacterial machinery and controlled conditions.
- Researchers are deliberately cautious, publishing as a preprint rather than a peer-reviewed paper, framing SpudCell as a step toward artificial life rather than artificial life itself.
- Their roadmap points toward self-sufficient synthetic cells that generate their own molecular components and allow mutations to arise naturally — each step edging closer to autonomous artificial organisms.
- No biosafety framework yet exists to govern this technology, and the scientists are calling urgently for one before synthetic cells become robust enough to operate outside the laboratory.
At the University of Minnesota, researchers have built SpudCell — a synthetic cell assembled from chemicals in a beaker, with no living ancestor. It grows, replicates a 90,000-base-pair genome, divides into daughter cells, and when a mutation was introduced that made some variants divide faster, those variants outcompeted the others across generations. Natural selection, operating on something that has never been biologically alive.
The team is careful not to overclaim. The work appears as a preprint, not yet peer-reviewed, and they describe SpudCell as a major step toward artificial life rather than artificial life itself. The cell cannot survive outside the lab — it depends on supplied nutrients, controlled conditions, and ribosomes borrowed from E. coli. After five generations, only about 30% of daughter cells carry the complete synthetic genome. By the standards of even the simplest natural organism, it is fragile.
What the researchers do assert is that life's core properties — growth, replication, division, evolution — are not mystical. They are biochemical processes that can be engineered from nonliving materials. SpudCell is, they write, the first minimal cell with a complete cell cycle, genetically encoded growth and division, all coupled to selection and competition.
The road ahead involves making synthetic cells self-sufficient: generating their own molecular machinery, distributing genetic material more reliably during division, and allowing mutations to arise naturally rather than by hand. Each advance moves the technology toward something that could function independently of a laboratory. The researchers warn that more autonomous synthetic cells are coming soon — and call urgently for biosafety frameworks that do not yet exist to govern them.
In a laboratory at the University of Minnesota, researchers have assembled something that behaves like life without being alive—at least not in any way nature intended. They call it SpudCell, and it represents the closest thing yet to a synthetic organism built entirely from scratch, from chemicals mixed in a beaker rather than inherited from a parent cell.
The system works. SpudCell grows. It replicates its genetic material. It divides into daughter cells. When researchers introduced a genetic mutation that made some cells divide faster than others, the faster-growing variants outcompeted their slower cousins across multiple generations—a demonstration of natural selection operating on something that has never been alive in the biological sense. The synthetic cell's 90,000-base-pair genome contains the instructions to produce proteins, to feed itself, to expand, and to reproduce. By any reasonable measure of what life does, SpudCell does it.
Yet the researchers are careful about what they claim. In a preprint posted Thursday on bioRxiv—meaning the work has not yet survived peer review—they describe this as a major step toward artificial life, not artificial life itself. SpudCell cannot survive in the wild. It cannot exist without constant external support: a carefully controlled laboratory environment, supplied nutrients, specialized molecular components, and ribosomes borrowed from E. coli bacteria. After five generations of division, only about 30 percent of the daughter cells inherited the complete synthetic genome. The system is fragile in ways that even the simplest natural cells are not.
The researchers frame their achievement as crossing a threshold from pure chemistry into something that exhibits the defining characteristics of life. "One of the most ambitious and fascinating goals of bioengineering is to build a biochemical system that could cross the threshold from chemistry to life," they wrote. They describe SpudCell as "the first minimal cell with a cell cycle, genetically encoded growth and division, all coupled to selection and competition." The work suggests that many of life's core properties—the ability to grow, replicate, divide, and evolve—are not mystical or irreproducible. They are biochemical processes that can be engineered from nonliving materials.
But the researchers also acknowledge what comes next. As synthetic cells become more sophisticated, more autonomous, more capable of operating outside laboratory conditions, they will pose new questions about safety and security. A synthetic organism designed for biotechnology applications—to produce medicines, break down pollutants, or manufacture materials—is not the same as a natural organism. It has no evolutionary history. It has no ecological role. It exists only because humans built it. The researchers call for an urgent framework to govern the development of this technology, one that does not yet exist.
Their next steps are practical: making synthetic cells more self-sufficient by having them generate their own molecular machinery rather than relying on borrowed components, improving how genetic material is distributed during division, and allowing mutations to arise naturally instead of being introduced by hand. Each advance moves the technology closer to something that could function independently. The researchers estimate that more robust, autonomous synthetic cells are coming soon. Whether the world is ready for them is another question entirely.
Notable Quotes
One of the most ambitious and fascinating goals of bioengineering is to build a biochemical system that could cross the threshold from chemistry to life— University of Minnesota researchers
The progress highlights the urgent need to develop a safety and security framework for future synthetic cell engineering— University of Minnesota researchers
The Hearth Conversation Another angle on the story
So SpudCell grows and divides and passes traits to offspring. In what sense is it not alive?
It's alive in behavior but not in independence. It's like a dancer performing the movements of life while standing on a stage someone else built, breathing air someone else pumped in. Without the laboratory, without the external nutrients and borrowed ribosomes, it collapses.
But couldn't you say the same about any cell in a petri dish? We keep bacteria alive in controlled conditions too.
True, but bacteria can survive outside the dish. They evolved to exist in the world. SpudCell was designed to exist in one specific setup. It's more like a machine that mimics life than a living thing that happens to be in a lab.
The researchers mention natural selection happening—faster-growing variants outcompeting slower ones. That's evolution, isn't it?
It is, but only within the boundaries they set. They introduced the mutation that created the variation. In nature, mutations arise randomly. Here, the researchers are essentially directing the play while calling it natural selection.
What worries you most about this technology advancing?
The gap between what it can do now and what it might do in five years. Right now it needs constant life support. But the researchers are explicit: they're working to make it more self-sufficient. At some point, you have something that can operate on its own, and then the question becomes: what do you do with it? Who decides?
You mean it could escape?
Not escape exactly. But it could be released intentionally, or designed for purposes we haven't thought through. The researchers themselves are calling for safety frameworks that don't exist yet. That's the real story—not that they built something remarkable, but that they built something remarkable and realized we have no rules for it.