Origin-of-life research has long been framed as a problem of assembly: how did prebiotic chemistry gather the boundary, metabolism, information carrier and replication machinery needed for the first minimal cell? A new theoretical paper, published in Discover Life on 21 September 2026, proposes a strikingly different answer. Rather than being built from below, the first minimal cells may have been what remained after a larger, over-supported prebiotic network was progressively stripped away by a process the author, Angus McCoss, calls thermodynamic pruning.
The paper models early prebiotic organisation as a heterogeneous scaffold network of mineral surfaces, hydrothermal pores, convection cells, redox and thermal gradients, wet-dry cycles, lipid films, templating surfaces, concentration traps and external periodicities. In this picture, the environment did not merely surround early chemistry; many of these supports may have actively performed functions that later cells internalised. A pore could supply compartmentalisation before membranes existed. A mineral surface could supply catalysis before ribozymes or peptides. Convection could supply circulation before selective transport, and a wet-dry cycle could supply repetition before reproduction became system-generated.
The central concept is generative overshoot. Weakly organised chemistry, the model argues, may initially require more external constraint than a later minimal cell needs. Once internal analogues of these scaffold functions begin to emerge, the system becomes over-supported: the same viability-relevant operation is performed twice, once by the environment and once by the emerging system. Redundancy correction then follows, and thermodynamic pruning removes unstable, weakly coupled, redundant, costly or context-bound supports. The function survives, but its source changes, a transition the author describes as fine-graining, in which a broad environmental constraint is replaced by more precise, local, selectable and transmissible control.
Crucially, the model claims that pruning does not simply preserve a pre-existing living system. It can induce closure. Before pruning, functions corresponding to individuation, memory, transformation and recursion may exist only as scaffold-distributed, externally supported and weakly coupled operations. When pruning removes scaffold alternatives and external shortcuts, the surviving internal operations may become mutually dependent for persistence. If they do, closure is induced; if they do not, the system relaxes back into non-life. The author terms this coupled state IMTR closure, after the four operator-classes: Individuation, Memory, Transformation and Recursion.
These operators map onto familiar minimal-cell requirements. Individuation corresponds to boundary formation, the persistent distinction between system and environment that localises chemical consequences. Memory corresponds to heritable information, whether in nucleic acids or in more primitive forms such as compositional inheritance or autocatalytic network structure. Transformation corresponds to metabolism, the sustained conversion of matter and energy into maintained organisation. Recursion corresponds to replication and construction, the re-instantiation of the system’s own organisation in a successor of the same functional type. The paper stresses that these are abstract functional classes rather than fixed biochemical prescriptions, and that earlier systems may have implemented them through mechanisms quite different from modern membranes, genomes and ribosomes.
The formalisation is deliberately minimal. Prebiotic organisation is represented as a dynamic heterogeneous hypergraph, in which scaffold nodes and coupling hyperedges are progressively weakened or removed by a pruning operator. Hyperedges may connect more than two nodes because many prebiotic processes are not pairwise: wet-dry cycling, mineral adsorption, monomer supply and thermal forcing may jointly create a polymerisation niche. Minimal-cell emergence occurs when an IMTR sub-hypergraph becomes self-maintaining under further pruning, a condition the paper states qualitatively rather than numerically. No thresholds are assigned values, and the author explicitly notes that a future quantitative model would need to define node states, coupling weights, operator timescales, pruning rules and viability criteria.
The model is emphatic that the default outcome of scaffold shedding is not life. Most trajectories remain within a non-living cycle of scaffold-rich organisation, overshoot, redundancy correction, pruning and inert relaxation. If pruning removes compartmentalisation before memory and transformation are linked, the chemistry disperses. If it removes transformation, memory-like polymers cannot be maintained or copied. If it removes memory, reactions persist but cannot preserve successful configurations. If it removes recursion, an organised individual may persist transiently but cannot form a lineage. Even when all four operators coexist without coupling, the result remains non-living: a compartment containing chemistry, a polymer inside a vesicle, or a catalytic cycle near a boundary, but not a mutually sustaining system.
The thermodynamic interpretation is stated with care. Living systems are dissipative structures that maintain local order by channelling matter and energy through themselves and exporting entropy, but so are flames, whirlpools, hurricanes, convection cells and Belousov-Zhabotinsky-type chemical oscillations. The distinctive claim is not that the life attractor maximises instantaneous dissipation, since a flame may dissipate energy faster over short timescales. Instead, IMTR closure may support more sustained and extensible dissipation by preserving and recursively amplifying the structures that dissipate free energy over longer durations and broader domains. On this view, non-living dissipative systems may repeat, but living systems inherit, allowing dissipative arrangements to accumulate, diversify and expand.
Despite its conceptual nature, the framework suggests concrete shifts in experimental strategy. The author proposes moving from production tests to scaffold-dependence tests: instead of asking only whether a mineral surface, pore system or wet-dry cycle can generate a component or process, researchers should ask whether the resulting function persists when the scaffold is weakened, replaced or withdrawn. Can internally generated catalysts maintain a reaction class after the mineral surface is removed? Can lipid, droplet or coacervate compartments preserve localisation after the pore constraint is relaxed? Can internal chemistry regulate copying and repair without complete dependence on external periodicity? Four observable signatures of scaffold internalisation follow: functional substitution, robustness under scaffold weakening, fine-graining of internalised functions, and operator coupling in which boundary, memory, transformation and recursion become mutually supportive rather than merely co-present.
The paper is explicit about its limitations. It is an organising hypothesis, not a completed chemical pathway, and it does not identify a specific historical sequence for the origin of life on Earth, nor claim that any particular scaffold was uniquely necessary. It does not assert that the four operators emerged simultaneously or within a single isolated protocell; IMTR closure may first have been realised at the level of protocell populations connected by exchange, fusion, fission and horizontal transfer before becoming localised in autonomous lineages. Evolution itself is treated not as a fifth operator but as a population-level consequence of memory, recursion, variation and differential persistence. The term attractor is used conceptually, and the author cautions that the model does not imply life is inevitable wherever free-energy gradients exist. Life, in this framing, is neither miraculous accident nor guaranteed outcome, but a natural physical possibility within sufficiently rich and sustained scaffold-coupling networks: the exceptional trajectory in which scaffold shedding is arrested at self-renewing closure rather than continuing into inert relaxation.
Subject of Research: A network-dynamical model proposing that minimal cells emerge through thermodynamic shedding of environmental scaffolds in prebiotic chemistry
Article Title: Scaffold shedding as a network dynamical model for the origin of minimal cells
Article References: McCoss, A. (2026). Scaffold shedding as a network dynamical model for the origin of minimal cells. Discover Life, 56(1), Article 44. https://doi.org/10.1007/s11084-026-09762-4
Image Credits: AI Generated
DOI: 10.1007/s11084-026-09762-4
Keywords: origin of life, minimal cells, prebiotic chemistry, scaffold shedding, thermodynamic pruning, IMTR closure, autocatalytic networks, protocells, dissipative structures, hypergraph model, generative overshoot, compositional inheritance
News Source: Bethany Barker. (October 28, 2026). Life by Subtraction: Minimal Cells May Emerge by Shedding Environmental Scaffolds. Scienmag.
