Macromolecular Crowding Enables Programmable Synthetic DNA Droplets for Artificial Cells

A new study from Science Tokyo shows that macromolecular crowding—the dense environment inside living cells—can be used as a design tool to control the formation and organization of synthetic DNA droplets. Researchers combined DNA nanostars with polymeric crowding agents to mimic the crowded cellular environment. They found that crowding promoted droplet formation and allowed precise control over droplet size, interactions, and spatial organization. This approach could lead to programmable artificial cell systems for studying cellular processes and building synthetic biological devices. The findings highlight the role of physical crowding in biomolecular condensation and open new avenues for bottom-up synthetic biology. By tuning crowding conditions, scientists can guide the assembly of DNA-based compartments with desired properties. This work brings us closer to engineering cell-like structures with tailored functions.