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• W2079534030 abstract "Numerous computational methods exist to assess the mode and strength of natural selection in protein-coding sequences, yet how distinct methods relate to one another remains largely unknown. Here, we elucidate the relationship between two widely used phylogenetic modeling frameworks: dN/dS models and mutation-selection (MutSel) models. We derive a mathematical relationship between dN/dS and scaled selection coefficients, the focal parameters of MutSel models, and use this relationship to gain deeper insight into the behaviors, limitations, and applicabilities of these two modeling frameworks. We prove that, if all synonymous changes are neutral, standard MutSel models correspond to dN/dS≤1⁠. However, if synonymous codons differ in fitness, dN/dS can take on arbitrarily high values even if all selection is purifying. Thus, the MutSel modeling framework cannot necessarily accommodate positive, diversifying selection, while dN/dS cannot distinguish between purifying selection on synonymous codons and positive selection on amino acids. We further propose a new benchmarking strategy of dN/dS inferences against MutSel simulations and demonstrate that the widely used Goldman–Yang-style dN/dS models yield substantially biased dN/dS estimates on realistic sequence data. In contrast, the less frequently used Muse–Gaut-style models display much less bias. Strikingly, the least-biased and most precise dN/dS estimates are never found in the models with the best fit to the data, measured through both AIC and BIC scores. Thus, selecting models based on goodness-of-fit criteria can yield poor parameter estimates if the models considered do not precisely correspond to the underlying mechanism that generated the data. In conclusion, establishing mathematical links among modeling frameworks represents a novel, powerful strategy to pinpoint previously unrecognized model limitations and strengths." @default.
• W2079534030 created "2016-06-24" @default.
• W2079534030 creator A5029841589 @default.
• W2079534030 creator A5070411498 @default.
• W2079534030 date "2015-01-08" @default.
• W2079534030 modified "2023-10-16" @default.
• W2079534030 title "The Relationship between dN/dS and Scaled Selection Coefficients" @default.
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• W2079534030 doi "https://doi.org/10.1093/molbev/msv003" @default.
• W2079534030 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4379412" @default.
• W2079534030 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25576365" @default.
• W2079534030 hasPublicationYear "2015" @default.
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