Milestone in Synthetic Life: First Artificial Cells Reproduce with 'One Mother, Two Different Daughters'
Release time:
2026-05-29
While debates rage over whether AI possesses "consciousness," synthetic biology has quietly achieved a milestone breakthrough: artificial cells can not only "live" but also "reproduce" like real cells — and they give birth to two distinctly different "offspring."On May 30, Beijing time, a team led by Qiao Yan and Wang Shu from the Institute of Chemistry, Chinese Academy of Sciences, in collaboration with Lin Yiyang's group from Beijing University of Chemical Technology and Professor Stephen Mann (FRS) from the University of Bristol, published a landmark study in Nature. They achieved, for the first time, heteromorphic asymmetric division of artificial cells without the involvement of proteins. This "minimalist" version of cell division not only reshapes our understanding of the origin of life but also paves the way for constructing artificial cells capable of self-proliferation and functional differentiation.
Cell division is a core hallmark of life. Nearly all complex life in nature relies on asymmetric division — a mother cell dividing into two functionally distinct daughter cells, enabling tissue differentiation and organ development. Previously, symmetric division of artificial vesicles or droplets had been achieved in synthetic biology, but these methods depended on complex protein machinery or artificial two-phase systems, still far from the proliferation mode of real life.The central goal of this study was to explore whether asymmetric division resembling that of life could be achieved using only simple lipids and nucleotides, without proteins or other complex biological macromolecules.
The team selected the cationic surfactant DDAB (didodecyldimethylammonium bromide) and anionic nucleotide ATP to self-assemble into multilayered liquid crystal droplets. These droplets, approximately 6 μm in diameter with a water content of about 46%, have an onion-like internal structure with concentric lamellar layers and ordered liquid crystal properties, but lack a central aqueous cavity.After adding alkaline phosphatase (ALP) to the system, the droplets undergo four stages within about 15 minutes:
Indentation formation – 95.7% of droplets develop a single dimple on their surface.
Bowl-shaped evolution – The dimple widens circumferentially, forming a bowl-like structure.
Core detachment – When the dimple angle reaches 80°–140°, the internal spherical core instantly detaches from the outer shell.
Structural reorganization – The core retains its original liquid crystal droplet structure, while the outer shell self‑seals into a water‑containing multilayered vesicle.
During division, the mother droplet also releases tubular and spherical small vesicles, losing about 35% of its total material.
Further mechanistic studies revealed that ALP does not enter the droplet interior but enriches on the surface, gradually dephosphorylating ATP between the layers. This reduces the electrostatic attraction between the lipid head groups and counterions, increasing the interlayer spacing from 3.34 nm to 3.43 nm, causing droplet swelling and instability.
More intriguingly, this division does not depend on specific nucleotide types — CTP, GTP, and TTP can also form splittable droplets with DDAB. Even without the enzyme, adding charge‑screening ions such as Mg²⁺, Ca²⁺, or Na⁺, or simply lowering the pH, triggers the exact same asymmetric division.The researchers hypothesize that the droplets naturally possess a core‑shell structure and topological defects at formation — these defects act as the "switch" for division. Thermal annealing experiments confirmed that after eliminating defects, droplets no longer divide even when ALP is added.Most remarkably, the division process enables the transfer and retention of functional biomolecules. Experiments showed that droplets can absorb molecules such as horseradish peroxidase (HRP), single‑stranded DNA, and dextran, and after division, these molecules are evenly distributed to both daughter structures, retaining their biological activity.
Notably, the core droplet exhibits higher enzymatic activity and can stably retain its contents for long periods, while the vesicle structure shows faster pH changes and gradual content release. This natural functional differentiation closely mirrors the process in nature where cell division produces daughters with distinct functions.Using an extremely minimalist system, this study accomplishes asymmetric division that previously required complex biological machinery. It suggests that the core features of life — proliferation and differentiation — may be far simpler than imagined: no DNA, no proteins needed. With just the two most fundamental building blocks of life — lipids and nucleotides — electrostatic interactions and topological defects are sufficient to accomplish the "business of giving birth."
This work offers a new hypothesis for the origin of life: early primitive life on Earth might have achieved proliferation and differentiation through such a minimalist mechanism. It also lays the foundation for next‑generation artificial cell design — potentially enabling the construction of smart artificial cells capable of self‑replication and on‑demand differentiation for applications such as targeted drug delivery, in vivo biocatalysis, and environmental remediation.As the researchers put it: "We have not only created 'living' artificial cells, but also taught them to 'reproduce' — and to give birth to two different offspring." This may well be the first step toward true synthetic life.
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