We've replicated in chemistry what only biology could do
In a Minneapolis laboratory, researchers have assembled a living cell from pure chemistry — no borrowed biology, no natural inheritance — and watched it grow and divide. Called SpudCell, this seven-strand construction challenges the long-held assumption that life requires a genetic minimum we cannot engineer around. The work awaits peer review, but the question it reopens is ancient and profound: where exactly does chemistry end and life begin?
- Scientists claim to have crossed a threshold once considered impossible, assembling a functional cell entirely from synthetic components — a declaration that life's machinery can be built, not just borrowed.
- The scientific community is unsettled: one journal reviewer dismissed SpudCell as not real biology at all, and the research remains unvalidated, circulating as a preprint rather than a peer-reviewed finding.
- SpudCell's own limitations create tension within the claim — it cannot sustain multiple generations, cannot evolve, and depends on surrounding nutrients for the very machinery that makes it run.
- Researchers are pressing toward a future where synthetic cells serve as precision biological factories, producing drugs and materials beyond what nature's own designs can efficiently deliver.
- The work is landing in a holding pattern — significant enough to command attention, contested enough to demand scrutiny, and consequential enough that its outcome will reshape how science defines the minimum conditions for life.
At the University of Minnesota, synthetic biologist Kate Adamala and her team say they have built a living cell entirely from scratch — no components borrowed from nature, no existing organism as a template. The cell, called SpudCell, consists of seven circular strands of DNA housed inside a fatty membrane bubble. It absorbs nutrients, grows, and divides. "We've replicated in chemistry what only used to be possible in biology," Adamala says.
SpudCell carries just 90 kilobase pairs of genetic material — well below the 113 kilobase pairs scientists long believed were the minimum for a functioning cell. That alone would be remarkable, but the claim remains unverified. The research has not yet passed peer review; one reviewer at the journal Cell reportedly rejected it outright, arguing it did not constitute real biology. For now, the work lives on the website of Biotic, a nonprofit Adamala co-founded, available as a preprint.
The cell's limitations are real and significant. SpudCell cannot sustain itself beyond a few generations, cannot produce its own protein-making machinery, and lacks the internal scaffolding real cells use to manage waste and movement. Most tellingly, it cannot evolve — it carries no capacity for mutation or adaptation. In the strictest sense, it sits at the edge of what we call life.
Yet the purpose behind building it points forward. Synthetic cells designed as biological factories could one day produce medicines and materials with a precision natural organisms cannot match. Whether SpudCell ultimately validates that vision or reveals the irreducible superiority of nature's own designs remains an open question — one the scientific community is now watching closely.
In a laboratory at the University of Minnesota, scientists say they have done something that was thought impossible just years ago: they built a living cell from the ground up, watched it grow, divide, and reproduce—all without borrowing a single component from nature. The cell, called SpudCell, is made of seven strands of DNA wrapped inside a fatty sphere, and it works. Or at least, it did, in the controlled environment of their experiment.
Kate Adamala, a synthetic biologist leading the project, describes the moment with the kind of wonder that suggests she knows how significant this claim is. "We've replicated in chemistry what only used to be possible in biology," she says. "The complete set of behaviors of a cell." The implication is staggering: the fundamental machinery of life—growth, replication, the ability to feed and divide—does not require anything mystical or unknowable. It can be built by human hands from chemical components.
SpudCell contains just 90 kilobase pairs of genetic material. To put that in perspective, the human genome contains roughly 3 million. For decades, biologists believed that any functioning cell would need at least 113 kilobase pairs to survive. SpudCell appears to shatter that assumption, though the research has not yet survived the scrutiny of peer review. The work exists for now in a kind of scientific limbo: shared on the website of Biotic, a nonprofit bioengineering institution Adamala helped establish, but not yet formally published. One reviewer at the journal Cell reportedly rejected the work outright, arguing it wasn't real biology at all.
The structure of SpudCell is elegant in its simplicity. A liposome—essentially a bubble of fat molecules—serves as the cell's outer membrane, mimicking the boundary of a real cell. Inside sit seven plasmids, small circular pieces of DNA borrowed from bacteria. These seven plasmids together constitute the entire genome. The system also includes a protein expression mechanism, a kind of molecular machinery that reads the genetic instructions and translates them into action. This is what allows SpudCell to absorb nutrients from the liquid surrounding it and convert those nutrients into the materials needed for growth and division.
But SpudCell has limits that distinguish it sharply from actual life. It cannot sustain itself beyond a few generations. It cannot manufacture its own protein-making machinery; it depends entirely on what floats in the medium around it. It lacks a cytoskeleton, the internal scaffolding that real cells use to move materials and dispose of waste. Most critically, it cannot evolve. It cannot mutate, adapt, or pass on variations to its offspring. In the strictest biological sense, SpudCell is not alive in the way we typically understand the term.
So why build it? The answer points toward the future. If scientists can design synthetic cells that function as biological factories, they could produce drugs, biomaterials, and chemicals with precision and efficiency that natural organisms cannot match. Genetically modified bacteria already serve this purpose in laboratories and in medicine—insulin is produced this way—but a fully synthetic cell might offer advantages that nature's designs cannot. It might also reveal that nature's designs are superior in ways we don't yet understand.
For now, SpudCell remains a proof of concept waiting for validation. The research is available as a preprint, and the scientific community is watching. Whether this represents a genuine breakthrough or an overreach will become clearer once the work passes through peer review. What seems certain is that the question of where life begins—what the minimum requirements are, what can and cannot be built from chemistry alone—has been reopened.
Notable Quotes
We've replicated in chemistry what only used to be possible in biology: the complete set of behaviors of a cell.— Kate Adamala, synthetic biologist
The Hearth Conversation Another angle on the story
Why does it matter if we can build a cell from scratch if it can't actually survive on its own?
Because it tells us something fundamental about what life is. For a long time, we treated cells as these irreducibly complex black boxes. Proving that you can assemble the core functions—growth, replication, division—from pure chemistry suggests those functions aren't magical. They're just chemistry.
But you said it can't evolve or sustain itself. Doesn't that make it not really alive?
That's the exact question the peer reviewers are wrestling with. Biologically, yes, it's missing crucial features. But conceptually, it's shown that the threshold for "life" might be lower than we thought. It's a proof of concept, not a finished product.
What would make it actually alive in the way we mean it?
The ability to persist across many generations without external support. To regulate its own metabolism. To evolve. Right now SpudCell is like a wind-up toy—it works once, then needs to be wound again. A truly living synthetic cell would need to be self-sustaining.
And that's where the practical applications come in?
Exactly. If you can design a synthetic cell that's self-sustaining and can be programmed to produce specific molecules, you've got a biological factory. No need to keep feeding it components. It just works.
Why hasn't this been peer-reviewed yet if it's real?
It has been submitted. One major journal rejected it, saying it wasn't real biology. That's partly fair—SpudCell doesn't meet all the criteria for life. But it's also partly gatekeeping. The work is real; the question is what category it belongs in.