World’s First Synthetic Cell With a Complete Life Cycle Marks Biology Breakthrough

Researchers at the University of Minnesota have developed SpudCell, the first synthetic cell constructed entirely from non-living chemical components capable of a complete life cycle. This breakthrough demonstrates that fundamental biological processes, including growth, DNA replication, and division, can be engineered from scratch using a minimal genome of 90,000 base pairs. For the synthetic biology sector, this achievement provides a new platform for testing cellular functions and moves the industry closer to the goal of creating custom-built cells for sustainable medicine and material production.

Led by Kate Adamala and Aaron Engelhart, the research team assembled SpudCell using a liposome structure—a lipid bubble containing protein-making machinery and a genome distributed across seven DNA plasmids. Unlike previous synthetic biology efforts that often modify existing organisms, SpudCell was built from purified, non-living parts. Its genome consists of 90,000 base pairs, which is significantly smaller than the 113,000 base pairs previously estimated as the minimum required for life, and far smaller than the 3 billion base pairs found in the human genome.

To sustain growth and replication, SpudCell utilizes a unique feeding mechanism where it fuses with smaller "feeder liposomes" to acquire lipids, ribosomes, and enzymes. This process is controlled by a specific protein that facilitates the merging of membranes, allowing the synthetic cell to bypass the need for complex internal metabolic pathways. For division, the researchers engineered the cell to use surface proteins that create physical strain on the membrane, causing it to split without the need for a traditional, complex cytoskeleton.

The researchers also demonstrated a form of selection within the system by introducing a genetic mutation that enhanced the cell's feeding efficiency. In a five-generation experiment, the modified cells grew faster and outcompeted the original version, particularly in nutrient-limited environments, proving that genetic advantages can drive population success in a lab-built chemical system. While SpudCell currently relies on external feeder liposomes and cannot yet rebuild its own ribosomes, it serves as a foundational platform for engineering more stable, autonomous synthetic organisms for industrial applications.