The dynamics of alternative pathways to compensatory substitution
| Autor: | Chris A. Nasrallah |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
0106 biological sciences
Mutation rate Population Population genetics Biology 010603 evolutionary biology 01 natural sciences Biochemistry Evolution Molecular 03 medical and health sciences Structural Biology Selection Genetic education Quantitative Biology - Populations and Evolution Molecular Biology Selection (genetic algorithm) Phylogeny 030304 developmental biology Probability Genetics 0303 health sciences education.field_of_study Natural selection Models Genetic Applied Mathematics Selection coefficient Populations and Evolution (q-bio.PE) Process substitution Computer Science Applications Proceedings Genetics Population Evolutionary biology FOS: Biological sciences Mutation (genetic algorithm) Mutation |
| Zdroj: | BMC Bioinformatics |
| DOI: | 10.48550/arxiv.1308.2135 |
| Popis: | The role of epistatic interactions among loci is a central question in evolutionary biology and is increasingly relevant in the genomic age. While the population genetics of compensatory substitution have received considerable attention, most studies have focused on the case when natural selection is very strong against deleterious intermediates. In the biologically-plausible scenario of weak to moderate selection there exist two alternate pathways for compensatory substitution. In one pathway, a deleterious mutation becomes fixed prior to occurrence of the compensatory mutation. In the other, the two loci are simultaneously polymorphic. The rates of compensatory substitution along these two pathways and their relative probabilities are functions of the population size, selection strength, mutation rate, and recombination rate. In this paper these rates and path probabilities are derived analytically and verified using population genetic simulations. The expected time durations of these two paths are similar when selection is moderate, but not when selection is weak. The effect of recombination on the dynamics of the substitution process are explored using simulation. Using the derived rates, a phylogenetic substitution model of the compensatory evolution process is presented that could be used for inference of population genetic parameters from interspecific data. Comment: 17 pages, 9 figures, 1 table. Accepted to RECOMB Comparative Genomics Meeting 2013, to be published in BMC Bioinformatics |
| Databáze: | OpenAIRE |
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