{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,27]],"date-time":"2026-02-27T06:23:03Z","timestamp":1772173383736,"version":"3.50.1"},"update-to":[{"DOI":"10.1371\/journal.pcbi.1012162","type":"new_version","label":"New version","source":"publisher","updated":{"date-parts":[[2025,1,20]],"date-time":"2025-01-20T00:00:00Z","timestamp":1737331200000}}],"reference-count":67,"publisher":"Public Library of Science (PLoS)","issue":"1","license":[{"start":{"date-parts":[[2025,1,3]],"date-time":"2025-01-03T00:00:00Z","timestamp":1735862400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["www.ploscompbiol.org"],"crossmark-restriction":false},"short-container-title":["PLoS Comput Biol"],"abstract":"<jats:p>Catalysis and specifically autocatalysis are the quintessential building blocks of life. Yet, although autocatalytic networks are necessary, they are not sufficient for the emergence of life-like properties, such as replication and adaptation. The ultimate and potentially fatal threat faced by molecular replicators is parasitism; if the polymerase error rate exceeds a critical threshold, even the fittest molecular species will disappear. Here we have developed an autocatalytic RNA early life mathematical network model based on enzyme kinetics, specifically the steady-state approximation. We confirm previous models showing that these second-order autocatalytic cycles are sustainable, provided there is a sufficient nucleotide pool. However, molecular parasites become untenable unless they sequentially degenerate to hyperparasites (i.e. parasites of parasites). Parasite resistance\u2013a parasite-specific host response decreasing parasite fitness\u2013is acquired gradually, and eventually involves an increased binding affinity of hyperparasites for parasites. Our model is supported at three levels; firstly, ribozyme polymerases display Michaelis-Menten saturation kinetics and comply with the steady-state approximation. Secondly, ribozyme polymerases are capable of sustainable auto-amplification and of surmounting the fatal error threshold. Thirdly, with growing sequence divergence of host and parasite catalysts, the probability of self-binding is expected to increase and the trend towards cross-reactivity to diminish. Our model predicts that primordial host-RNA populations evolved via an arms race towards a host-parasite-hyperparasite catalyst trio that conferred parasite resistance within an RNA replicator niche. While molecular parasites have traditionally been viewed as a nuisance, our model argues for their integration into the host habitat rather than their separation. It adds another mechanism\u2013with biochemical precision\u2013by which parasitism can be tamed and offers an attractive explanation for the universal coexistence of catalyst trios within prokaryotes and the virosphere, heralding the birth of a primitive molecular immunity.<\/jats:p>","DOI":"10.1371\/journal.pcbi.1012162","type":"journal-article","created":{"date-parts":[[2025,1,3]],"date-time":"2025-01-03T16:04:42Z","timestamp":1735920282000},"page":"e1012162","update-policy":"https:\/\/doi.org\/10.1371\/journal.pcbi.corrections_policy","source":"Crossref","is-referenced-by-count":0,"title":["Biomathematical enzyme kinetics model of prebiotic autocatalytic RNA networks: degenerating parasite-specific hyperparasite catalysts confer parasite resistance and herald the birth of molecular immunity"],"prefix":"10.1371","volume":"21","author":[{"given":"Magnus","family":"Pirovino","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2296-2863","authenticated-orcid":true,"given":"Christian","family":"Iseli","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joseph A.","family":"Curran","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3662-9041","authenticated-orcid":true,"given":"Bernard","family":"Conrad","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"340","published-online":{"date-parts":[[2025,1,3]]},"reference":[{"key":"pcbi.1012162.ref001","doi-asserted-by":"crossref","first-page":"1556","DOI":"10.1038\/s41559-018-0644-x","article-title":"Integrated genomic and fossil evidence illuminates life\u2019s early evolution and eukaryote origin","volume":"2","author":"HC Betts","year":"2018","journal-title":"Nat Ecol Evol"},{"key":"pcbi.1012162.ref002","doi-asserted-by":"crossref","first-page":"101756","DOI":"10.1016\/j.isci.2020.101756","article-title":"Thresholds in Origin of Life Scenarios.","volume":"23","author":"C Jeancolas","year":"2020","journal-title":"iScience"},{"key":"pcbi.1012162.ref003","doi-asserted-by":"crossref","first-page":"465","DOI":"10.1007\/BF00623322","article-title":"Self-organization of matter and the evolution of biological macromolecules","volume":"58","author":"M. 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