SpudCell: The First Synthetic Cell Built From Scratch That Feeds, Grows, and Divides

SpudCell is radically simpler than any natural cell. A typical bacterium like E. coli contains millions or billions of molecules; SpudCell contains only 150 to 200 molecules total . Its genome consists of seven loops of designer DNA encoding instructions for growth and reproduction . (Earlier pre-publication work by the same group describes a partial synthetic genome of over 200 kb with more than 150 genes .)

SpudCell relies on the PURE system (Protein synthesis Using Recombinant Elements)—a minimal, reconstituted in-vitro transcription-translation machinery. It has no native metabolism and depends entirely on this bespoke molecular environment to express its genetic program .

How It Feeds

The cell membrane incorporates transmembrane pores based on the bacterial protein alpha-hemolysin, which allow nucleotides and small nutrient molecules to flow into the cell . The pores can be opened or closed by adding a chemical inducer, giving the team controlled feeding .

How It Divides

Division is driven by recruiting membrane-localized FtsZ protein (the bacterial tubulin homolog) to the lipid bilayer. When enough FtsZ accumulates, it forms a contractile ring that pinches the membrane inward until the cell splits in two. The system uses a light-sensitive or chemically inducible protein anchor to control when and where FtsZ assembles, providing external control over division timing .

The Major Limitations: Not Quite Alive

Despite the breakthrough, SpudCell is far from a self-sustaining living organism. Researchers are candid about its shortcomings:

• Inefficient division: Division is described as "clumsy." Only a fraction of SpudCells successfully complete fission; many stop constricting or lyse .
• Poor genome retention: Daughter cells frequently inherit an incomplete or no copy of the genome. The team estimates genome retention falls well below 50% per division, meaning many "offspring" cannot continue the cycle .
• Ribosome degradation: The PURE system's ribosomes degrade over the cell cycle. After 3–4 generations, protein synthesis stalls and the cell line collapses. This limits the SpudCell lineage to roughly 5 generations (about 2–3 days) before it must be replaced .
• No Darwinian evolution: SpudCell performs programmed replication but cannot mutate, compete, or evolve autonomously. Every cycle is a deterministic execution of the externally provided program—not open-ended evolution .

As Adamala told CNN, SpudCell is "a very fragile organism that primarily exists to consume and occasionally produce a daughter" .

Peer Review Status

The research is under review at a scientific journal but has not yet completed peer review. The team posted a 190-page preprint account of their work online. The New York Times, quoting the researchers, confirmed the manuscript is under review . The specific journal has not been disclosed.

Biotic: An Open-Source Future for Synthetic Cells

Alongside the SpudCell announcement, the researchers revealed Biotic (BIOTIC)—a newly established U.S. 501(c)(3) public-benefit charity co-founded by Kate Adamala and Stanford synthetic biologist Drew Endy .

Biotic's mission is to advance emerging biotechnologies on a multilateral, open-source basis. The University of Minnesota holds the patent on SpudCell but has exclusively licensed it to Biotic, which is structured to keep the foundational technology freely available to researchers worldwide—mirroring the approach of the Human Genome Project . Drew Endy's Caltech biography confirms he "recently co-founded BIOTIC as a new charity advancing emerging biotechnologies on a multilateral basis" .

Why It Matters

SpudCell represents a dramatic step toward the long-standing goal of building a living cell from scratch. It provides a minimal platform for studying the fundamental requirements of life and could eventually enable applications in medicine, bio-manufacturing, and chemical production. As Adamala told the Star Tribune, the motivation is to "switch the economy to bioeconomy" by making chemicals without petrochemicals .

But for now, SpudCell is a proof of principle—a fragile, short-lived assemblage of molecules that mimics life more closely than anything built before, but is not yet alive by any standard definition.