Can synthetic biology create truly artificial living systems?

What has synthetic biology actually built so far?

The most direct answer comes from a 2025 study that engineered artificial mitochondria—tiny energy-producing factories—inside synthetic cells [1]. The researchers encapsulated two enzymes (glucose oxidase and catalase) inside silica nanocapsules, then coated them with an ATPase-integrated liposome bilayer. This setup created a self-reinforcing enzymatic cascade that amplified proton production, generating a strong transmembrane proton gradient. That gradient drove ATP synthase rotation, enabling high-yield ATP production—the energy currency of life [1]. When these artificial mitochondria were placed inside giant unilamellar vesicles (synthetic cell models), they supported autonomous NADH biosynthesis and glucose-powered oxidative phosphorylation, which are core metabolic processes of living cells [1].

Beyond energy, synthetic biology has created 'living' drug delivery systems by engineering human and bacterial cells with synthetic gene circuits that sense disease biomarkers and release therapeutic cargo with spatiotemporal control [2][6]. For example, gut commensal bacteria have been engineered to execute 'sense-and-respond' logic operations, detecting specific signals in the intestine and delivering therapeutic payloads in real time [3]. These systems are not fully artificial life, but they demonstrate that synthetic biology can program cells to perform complex, life-like functions.

What is still missing for truly artificial living systems?

Despite these advances, current synthetic cells lack several hallmarks of natural life. They do not self-replicate, evolve, or maintain homeostasis autonomously over long periods. The artificial mitochondria study, while impressive, still relies on externally supplied glucose and does not include a genetic system for self-repair or reproduction [1]. Similarly, engineered living therapeutics are built on existing living cells (human or bacterial), not created from scratch [2][6].

A 2023 review on synthetic cells notes that bottom-up synthetic biology has made 'important advances' but still produces 'protocells'—simplified models that capture some, not all, features of life [5]. The field is exploring 'chemical AI' and semantic information processing in these systems, but full autonomy and cognition remain distant goals [5]. Ethical discussions also highlight that if artificial life ever achieves sufficient sophistication, it may deserve moral consideration similar to that given to nonhuman vertebrates, but that threshold has not been reached [7].

How close are we to creating truly artificial life?

The field is making rapid progress, but a fully artificial living system—one that is self-sustaining, self-reproducing, and capable of evolution—is likely years or decades away. The artificial mitochondria study represents a major step by demonstrating autonomous energy metabolism in a synthetic cell [1]. However, integrating this with a synthetic genome, a self-replicating membrane, and a system for responding to environmental changes remains a formidable challenge.

A 2023 review on engineered living materials emphasizes that synthetic biology can now program cells to self-organize, respond to stimuli, and couple with inorganic matter, but these materials are still 'living' in the sense that they contain natural cells [4][8]. The creation of a fully synthetic organism—built entirely from non-living components—has not been achieved. As one 2021 analysis notes, even if we create synthetic life, its value may be lower than that of natural life due to reduced complexity and salience of life-like properties [9]. So while the answer to the question is 'yes, in part,' the full realization of truly artificial living systems remains an active frontier of research.

Sources used in this answer

Related research questions