Noisy clues to the origin of life.
The origin of stable self-replicating molecules represents a fundamental obstacle to the origin of life. The low fidelity of primordial replicators places restrictions on the quantity of information encoded in a primitive nucleic acid alphabet. Further difficulties for the origin of life are the role of drift in small primordial populations, reducing the rate of fixation of superior replicators, and the hostile conditions increasing developmental noise. Thus, mutation, noise and drift are three different stochastic effects that are assumed to make the evolution of life improbable. Here we show, to the contrary, how noise present in hostile early environments can increase the probability of faithful replication, by amplifying selection in finite populations. Noise has negative consequences in infinite populations, whereas in finite populations, we observe a synergistic interaction among noise sources. Hence, two factors formerly considered inimical to the origin of life-developmental noise and drift in small populations-can in combination give rise to conditions favourable to robust replication.
Krakauer
David C
DC
Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, NM 87501, USA. krakauer@santafe.edu
Sasaki
Akira
A
D005075:Biological Evolution; D002384:Catalysis; D040961:Genetic Drift; D008954:Models, Biological; D009154:Mutation; D009696:Nucleic Acids / Q000378:metabolism; D000069497:Origin of Life; D011506:Proteins / Q000378:metabolism; D013269:Stochastic Processes
D009696:Nucleic Acids; D011506:Proteins