On July 1, 2026, a team led by synthetic biologist Dr. Katarzyna (Kate) Adamala and associate professor Aaron Engelhart at the University of Minnesota Twin Cities posted a preprint on bioRxiv describing a synthetic cell nicknamed SpudCell — arguably the closest science has come to building a living cell entirely from scratch, using only chemically defined, non-living starting materials.

The preprint, titled “A Chemically Defined Synthetic Cell Capable Of Growth And Replication,” reports that SpudCell can:

• Feed — acquire lipids and molecular building blocks from its environment
• Grow — expand by fusing with smaller “feeder” liposomes
• Replicate its genome — copy its own DNA using an enzyme borrowed from a bacteriophage
• Divide — split into daughter cells without any cytoskeleton
• Undergo selection and competition — spread an advantageous genetic mutation through a population over multiple generations

According to the authors, this is the first synthetic cell built from non-living components shown to complete an entire cell cycle in one integrated system.

01What Exactly Is SpudCell?

Strip away the excitement, and SpudCell is remarkably simple in composition: a microscopic water droplet enclosed by a fatty membrane (a liposome), packed with roughly 150–200 molecules — compared to the millions or billions of molecules found in a single bacterial cell. It carries a 90-kilobase-pair (kbp) genome, split across seven to eight separate DNA plasmids rather than one continuous chromosome, encoding just 36 genes.

For comparison, the human genome runs to about 3 billion base pairs, and biologists had long assumed a living cell would need at least 113 kbp of genetic information to sustain itself. SpudCell’s 90 kbp genome sits below that previously assumed floor — one of the more provocative findings in the paper.

Every component of SpudCell — down to the exact identity and concentration of each molecule — is known and controllable. This is what the authors mean by “chemically defined”: unlike synthetic-cell approaches that start by stripping down an existing bacterium, nothing here comes from an unknown or unmeasured source.

02The Engineering Behind It

The PURE system: a cell’s machinery, without the cell

SpudCell’s protein-making machinery comes from PURE (Protein synthesis Using Recombinant Elements) — a defined cocktail of purified proteins, ribosomes, and small molecules capable of transcribing DNA into RNA and translating RNA into protein outside of any living cell. Because every component of PURE is individually known, it lets researchers claim a fully chemically defined system.

Feeding: growth by fusion, not synthesis

Real cells synthesize their own lipids and nutrients. SpudCell doesn’t — instead, it feeds by fusing with smaller “feeder” liposomes that supply lipids, enzymes, ribosomes, and small molecules. The fusion is genetically encoded: SpudCell’s genome directs production of a modified pore protein (α-hemolysin) carrying a 6×His peptide tag, displayed on the cell’s surface, which mediates fusion with feeder vesicles carrying a matching linker. Because this fusion machinery is expressed from the cell’s own genome, growth is directly tied to gene expression.

Genome replication: borrowed from a virus

To copy its DNA, SpudCell uses the Phi29 DNA polymerase, an enzyme taken from a bacteriophage that infects the bacterium Bacillus subtilis. Phi29 performs rolling-circle amplification of the plasmids that make up SpudCell’s genome — well-established molecular biology, repurposed for a new job.

Division without a cytoskeleton

Living cells divide using cytoskeletal machinery that synthetic biology hasn’t yet fully recreated. Adamala’s team sidestepped this by exploiting a purely physical effect: protein crowding on a membrane surface can deform and eventually split it. By tagging SpudCell’s membrane with specific proteins (streptavidin bound via a His-tag/Ni-NTA linker system), the accumulated mechanical stress buckles and pinches the membrane apart. Researchers confirmed genuine division — not just shrinkage — by immobilizing cells on magnetic beads and tracking which DNA ended up in the “parent” fraction still attached versus the free-floating “daughter” fraction.

Selection and competition

The team engineered two versions of SpudCell that differed only in the strength of the genetic promoter driving their feeding/growth protein — a weaker “T7” version and a stronger “T7Max” version. When grown together, the faster-growing T7Max cells produced more daughter cells and came to dominate the population within five generations — a direct, lab-demonstrated example of selection acting on a genetic difference. When food (feeder liposomes) was made scarce, the advantage of the faster growers became even more pronounced, illustrating competition for limited resources.

03Five Generations, Fully Tracked

Across repeated feeding-growth-division cycles, the team tracked SpudCell populations through five generations, confirming at each stage that all seven plasmids of the 90 kbp genome were still present and being replicated, that newly synthesized DNA and RNA matched expectations, that the liposomes weren’t leaking their contents, and that daughter cells inherited the complete multi-partite genome after feeding, replication, and division together.

This is described in the preprint as the first demonstration of a synthetic cell coupling genetically encoded growth and genetically encoded division in the same system.

04Is SpudCell “Alive”? The Scientific Debate

This is where the story gets genuinely contested — and the researchers themselves are careful not to overclaim. Adamala has been characteristically blunt, reportedly describing SpudCell as an “incredibly wimpy organism” that currently does little beyond feeding and occasionally producing a daughter cell.

Reactions from the wider synthetic-biology community have been split between genuine excitement and caution:

• Roseanna Zia, a computational cell biologist at the University of Missouri, called the work a “stunning scientific achievement.”
• John Glass of the J. Craig Venter Institute, a veteran of the minimal-genome field, reportedly described it as a landmark moment in the history of biology, and told the New York Times that the team had built a non-living synthetic cell markedly closer to “alive” than anything else the bottom-up synthetic-cell field has produced.
• Drew Endy, a Stanford bioengineering professor who co-founded a new research institute with Adamala, offered perhaps the clearest line: he considers SpudCell a genuinely constructed cell, but stops short of calling it life.
• Kerstin Göpfrich, a synthetic biologist at Heidelberg University, was more measured about the rollout of the research itself, calling the decision to brief journalists before peer review “an unusual way of doing things.”

Endy draws an analogy worth keeping: physicists still don’t fully understand gravity, yet engineers build bridges. In his view, the same practical logic applies here — you don’t need a settled definition of “life” to keep building working cells. — Paraphrased from reporting on Drew Endy’s comments, Stanford University

The consensus among independent scientists appears to be that SpudCell is a major engineering milestone in bottom-up synthetic biology, without itself qualifying as a living organism by standard biological definitions.

05The Publication Controversy

The path this research took to public attention has become almost as talked-about as the science itself. According to multiple reports, Adamala’s manuscript was rejected by the journal Cell after a reviewer argued that SpudCell did not constitute “real biology.” Rather than continuing quietly through the standard peer-review cycle, Adamala shared the roughly 190-page manuscript with journalists under embargo before posting it to the preprint server bioRxiv on July 1–2, 2026. The paper has not yet been peer-reviewed, and the authors say it will be submitted to a different journal.

Reactions inside the field have been mixed — some researchers have questioned prioritizing media attention over peer review, while others, including Endy, have defended it as a courageous way to bring wider attention (and funding) to synthetic-cell research.

06What Comes Next: Biotic

Alongside the SpudCell paper, Adamala, Endy, and colleagues Jan Jedryszek and biotech entrepreneur Chris Raggio founded Biotic, a public-benefit research institution intended to coordinate the fragmented field of synthetic-cell research and accelerate progress toward more capable artificial life. The organization reportedly has on the order of $10 million in seed funding, most of which is expected to go out as research grants. Its stated ambition is to turn SpudCell-style engineering into a routine, buildable “chassis” other labs and companies can adapt — with potential long-term applications spanning custom medicines, biomanufacturing, and materials grown rather than manufactured.

07Why This Matters for Biology Students

For students following NEET Biology and general cell biology coursework, SpudCell is a striking real-world case study connecting several core textbook ideas:

• Cell theory and the definition of life — SpudCell forces a re-examination of what criteria (metabolism, growth, reproduction, response to stimuli, homeostasis) are actually necessary and sufficient to call something “alive.”
• Structure of the cell — its lipid membrane, DNA-based genome, and protein-synthesis machinery mirror the same basic components taught for real cells, just assembled artificially and in minimal form.
• Central dogma of molecular biology — SpudCell’s function depends entirely on transcription and translation, made possible by the PURE cell-free expression system.
• Genetics, mutation, and selection — the T7 vs. T7Max experiment is a clean, lab-scale illustration of how a single genetic difference can spread through a population under selective pressure.
• Origin-of-life research — by showing which minimal set of components can sustain a cell cycle, this work feeds directly into long-standing questions about how the first cells on Earth might have assembled from non-living chemistry.