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Out-of-equilibrium competitive dynamics of quasispecies

AuthorsAguirre, Jacobo; Manrubia Cuevas, Susanna
Keywords[PACS] Biological and medical physics: General theory and mathematical aspects
[PACS] Dynamics of evolution
[PACS] Other topics in areas of applied and interdisciplinary physics
Issue Date22-Jan-2007
PublisherEDP Sciences
Institute of Physics Publishing
Società Italiana di Fisica
CitationEPL 77(3): 38001 (2007)
AbstractThe composition of a quasispecies is completely characterized, in the large population and long time limit, by the matrix yielding the transition probabilities between different types in the population. Further, its asymptotic growth rate —i.e. the largest eigenvalue of the transition matrix— completely determines the winning population in an equilibrium competition. However, due to the intrinsically heterogeneous nature of quasispecies, out-of-equilibrium fluctuations in population size might change the expected fate of competition experiments. Using a simple model for a heterogeneous population we quantify the probability that, after a population bottleneck, the a priori weaker competitor wins in a competition with a population characterized by a larger asymptotic growth rate. We analyse the role played by different degrees of neutrality in the outcome of the process, and demonstrate that lower neutrality favours the weaker competitor in out-of-equilibrium situations. Our results might shed light on empirical observations in competition experiments with RNA viruses.
Description6 pages, 4 figures.-- PACS nrs.: 87.10.+e; 87.23.Kg; 89.90.+n.-- ISI Article Identifier: 000245743000025.-- Printed version published Feb 2007.
Publisher version (URL)http://dx.doi.org/10.1209/0295-5075/77/38001
Appears in Collections:(CAB) Artículos
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