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- W3092315619 abstract "Natural selection acting on synonymous mutations in protein-coding genes influences genome composition and evolution. In viruses, introducing synonymous mutations in genes encoding structural proteins can drastically reduce viral growth, providing a means to generate potent, live-attenuated vaccine candidates. However, an improved understanding of what compositional features are under selection and how combinations of synonymous mutations affect viral growth is needed to predictably attenuate viruses and make them resistant to reversion. We systematically recoded all nonoverlapping genes of the bacteriophage ΦX174 with codons rarely used in its Escherichia coli host. The fitness of recombinant viruses decreases as additional deoptimizing mutations are made to the genome, although not always linearly, and not consistently across genes. Combining deoptimizing mutations may reduce viral fitness more or less than expected from the effect size of the constituent mutations and we point out difficulties in untangling correlated compositional features. We test our model by optimizing the same genes and find that the relationship between codon usage and fitness does not hold for optimization, suggesting that wild-type ΦX174 is at a fitness optimum. This work highlights the need to better understand how selection acts on patterns of synonymous codon usage across the genome and provides a convenient system to investigate the genetic determinants of virulence." @default.
- W3092315619 created "2020-10-15" @default.
- W3092315619 creator A5014658449 @default.
- W3092315619 creator A5015588274 @default.
- W3092315619 creator A5016737202 @default.
- W3092315619 creator A5022039008 @default.
- W3092315619 creator A5038531193 @default.
- W3092315619 creator A5054775452 @default.
- W3092315619 creator A5076550740 @default.
- W3092315619 creator A5080996898 @default.
- W3092315619 creator A5089627980 @default.
- W3092315619 date "2020-10-12" @default.
- W3092315619 modified "2023-10-03" @default.
- W3092315619 title "ΦX174 Attenuation by Whole-Genome Codon Deoptimization" @default.
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