Neutral quasispecies evolution and the maximal entropy random walk
| Autor: | Smerlak, M. |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Viral quasispecies
Information theory 01 natural sciences 03 medical and health sciences 0103 physical sciences Quantitative Biology::Populations and Evolution Statistical physics 010306 general physics Evolutionary dynamics Research Articles 030304 developmental biology Mathematics Evolutionary Biology 0303 health sciences Neutral network Multidisciplinary Markov chain Physics SciAdv r-articles Robustness (evolution) respiratory system Random walk Quantitative Biology::Genomics human activities Research Article Neutral mutation |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| DOI: | 10.1126/sciadv.abb2376 |
| Popis: | In large, genetically diverse populations (e.g., RNA viruses), neutral evolution is no less directional than adaptive evolution. Even if they have no impact on phenotype, neutral mutations are not equivalent in the eyes of evolution: A robust neutral variant—one which remains functional after further mutations—is more likely to spread in a large, diverse population than a fragile one. Quasispecies theory shows that the equilibrium frequency of a genotype is proportional to its eigenvector centrality in the neutral network. This paper explores the link between the selection for mutational robustness and the navigability of neutral networks. I show that sequences of neutral mutations follow a “maximal entropy random walk,” a canonical Markov chain on graphs with nonlocal, nondiffusive dynamics. I revisit M. Smith’s word-game model of evolution in this light, finding that the likelihood of certain sequences of substitutions can decrease with the population size. These counterintuitive results underscore the fertility of the interface between evolutionary dynamics, information theory, and physics. |
| Databáze: | OpenAIRE |
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