abiogenesis-chemical-evolution

byLeo Wierny

BUILD AN EMERGENT ORIGIN-OF-LIFE SIMULATION Build a complete, interactive, scientifically grounded simulation of abiogenesis and chemical evolution. This must NOT be a traditional artificial-life simulation where organisms, metabolism, reproduction, DNA, food, predators, fitness, or species are manually scripted. The central rule is: SCRIPT THE LAWS. DO NOT SCRIPT LIFE. Begin with chemistry, matter, energy and environmental gradients. If organized systems emerge, they must emerge because the underlying physical and chemical rules make them possible. The ultimate experiment is: Can an initially nonliving chemical environment, continuously driven away from thermodynamic equilibrium by external energy, spontaneously produce persistent autocatalytic systems, compartments, heredity, competition, evolution and increasingly organism-like entities? There must never be a command equivalent to: spawnLife() There must never be: if molecule == RNA then reproduce There must never be: organism.health += energy There must never be a manually assigned evolutionary fitness score. Instead: physics → chemistry → reaction networks → self-organization → compartments → replication → variation → differential persistence → evolution if the simulated conditions allow those things to occur. ⸻ 1. FUNDAMENTAL PHILOSOPHY Treat life as a special organizational state of ordinary matter. The simulation begins with no distinction between “living” and “nonliving.” Everything consists of chemicals interacting according to the same rules. A structure only becomes organism-like because it: * maintains chemical disequilibria * captures usable free energy * acquires raw materials * catalyzes reactions * repairs or replaces components * preserves internal conditions * contains reaction networks * creates copies or descendants * transmits chemically encoded information * produces imperfect descendants * competes for limited resources * consequently undergoes natural selection Do not give any of those properties to a structure merely because it has been labeled an organism. ⸻ 2. DO NOT ATTEMPT TO ENUMERATE ALL POSSIBLE CHEMICALS A literal database containing every possible chemical is impossible. Instead create an extensible chemical grammar. Each molecular species should contain properties such as: * elemental formula * molecular graph * bond topology * molecular mass * formal charge * acid/base groups * oxidation state * polarity * hydrophobicity * solubility * diffusion coefficient * absorption spectrum * approximate heat capacity * bond energies * activation-energy estimates * membrane permeability * adsorption affinity for mineral surfaces * catalytic groups * degradation pathways * polymerization sites * stereochemistry where relevant Allow previously unseen molecular species to be constructed dynamically from valid chemical transformations. The initial library below is therefore the starting chemistry, not the universe of possible chemistry. ⸻ 3. INITIAL EARLY-EARTH CHEMICAL INVENTORY Include at minimum the following species or chemically equivalent protonation states. Solvent and acid/base chemistry H₂O H⁺ / H₃O⁺ OH⁻ Model water explicitly as the bulk solvent at the continuum level rather than rendering every water molecule. Local pH must emerge from acid/base concentrations. ⸻ Major dissolved ions Na⁺ K⁺ Mg²⁺ Ca²⁺ Fe²⁺ Fe³⁺ Ni²⁺ Zn²⁺ Mn²⁺ Cl⁻ HS⁻ S²⁻ SO₃²⁻ SO₄²⁻ HCO₃⁻ CO₃²⁻ H₂PO₄⁻ HPO₄²⁻ PO₄³⁻ Their concentrations must influence ionic strength, membrane stability, polymer folding, precipitation and reaction rates. ⸻ Atmospheric/geochemical feedstock H₂ N₂ CO₂ CO CH₄ NH₃ NH₄⁺ H₂S SO₂ Allow gas exchange between atmosphere and water according to solubility and partial pressure. ⸻ Important prebiotic carbon/nitrogen compounds HCN — hydrogen cyanide HNC — hydrogen isocyanide where appropriate NH₂CN — cyanamide HC₃N — cyanoacetylene HCONH₂ — formamide HCHO — formaldehyde CH₃CHO — acetaldehyde CH₃OH — methanol HOCH₂CHO — glycolaldehyde glyceraldehyde dihydroxyacetone glyoxal Do not treat these merely as collectible resources. They participate in kinetic reaction networks. ⸻ Simple organic acids formic acid / formate acetic acid / acetate glycolic acid lactic acid / lactate pyruvic acid / pyruvate oxalic acid / oxalate malonic acid succinic acid / succinate fumaric acid / fumarate malic acid / malate Allow additional carboxylic acids to emerge. ⸻ Amino acids At minimum: glycine alanine serine aspartic acid glutamic acid valine leucine isoleucine proline threonine cysteine methionine phenylalanine Do not assume modern protein synthesis. These are simply molecules capable of reactions including condensation into short peptides. Additional amino acids and non-biological amino-acid analogues may form. ⸻ Sugars and sugar precursors formaldehyde glycolaldehyde glyceraldehyde ribose arabinose xylose erythrose ribulose simple hexoses when reaction pathways permit Include instability and degradation. Do not make ribose artificially immortal. ⸻ Nucleobases and precursors adenine guanine cytosine uracil purine pyrimidine related prebiotic heterocycles Thymine can arise later but does not need to dominate primordial chemistry. ⸻ Nucleosides and nucleotides adenosine guanosine cytidine uridine AMP GMP CMP UMP Allow activated versions where chemically justified. ADP and ATP should be possible products of chemistry but should NOT simply be supplied as the universal primordial energy currency. Primitive systems should initially be capable of using other energetic chemistry. ⸻ Phosphorus chemistry orthophosphate pyrophosphate trimetaphosphate other condensed phosphates acetyl phosphate Include phosphate adsorption to minerals and realistic difficulty of phosphorylation. ⸻ Sulfur chemistry and energetic intermediates hydrogen sulfide bisulfide sulfide elemental sulfur where relevant thiols methanethiol simple thioesters acetyl thioesters Thioester chemistry should be capable of coupling energetically favorable and unfavorable reactions. ⸻ Amphiphiles Include families rather than a single magic lipid. fatty acids approximately C6–C18 octanoic acid decanoic acid lauric acid myristic acid palmitic acid simple fatty alcohols glycerol monoacylglycerols simple amphiphilic esters Amphiphilic properties must arise from molecular structure. Above appropriate concentrations, amphiphiles should spontaneously: form micelles form sheets form droplets form vesicles exchange molecules grow shrink fuse rupture Do not script a “cell membrane object” first. A membrane should originate from amphiphile self-assembly. For computational scalability, it is acceptable to replace fully atomistic membrane simulation with a validated coarse-grained membrane model. ⸻ 4. MINERAL WORLD Include mineral surfaces because early-Earth chemistry did not occur in an empty beaker. Include: FeS / mackinawite FeS₂ / pyrite Fe₃S₄ / greigite NiS magnetite silica serpentine minerals olivine-related minerals brucite carbonate minerals iron oxides clay minerals such as montmorillonite phosphate-bearing minerals It is watching something appear that we did not explicitly tell the program to make. I’m not gonna get to detailed but start