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Title: Variation and selection on codon usage bias across an entire subphylum

Journal Article · · PLoS Genetics

Variation in synonymous codon usage is abundant across multiple levels of organization: between codons of an amino acid, between genes in a genome, and between genomes of different species. It is now well understood that variation in synonymous codon usage is influenced by mutational bias coupled with both natural selection for translational efficiency and genetic drift, but how these processes shape patterns of codon usage bias across entire lineages remains unexplored. To address this question, we used a rich genomic data set of 327 species that covers nearly one third of the known biodiversity of the budding yeast subphylum Saccharomycotina. We found that, while genome-wide relative synonymous codon usage (RSCU) for all codons was highly correlated with the GC content of the third codon position (GC3), the usage of codons for the amino acids proline, arginine, and glycine was inconsistent with the neutral expectation where mutational bias coupled with genetic drift drive codon usage. Examination between genes’ effective numbers of codons and their GC3 contents in individual genomes revealed that nearly a quarter of genes (381,174/1,683,203; 23%), as well as most genomes (308/327; 94%), significantly deviate from the neutral expectation. Finally, by evaluating the imprint of translational selection on codon usage, measured as the degree to which genes’ adaptiveness to the tRNA pool were correlated with selective pressure, we show that translational selection is widespread in budding yeast genomes (264/327; 81%). These results suggest that the contribution of translational selection and drift to patterns of synonymous codon usage across budding yeasts varies across codons, genes, and genomes; whereas drift is the primary driver of global codon usage across the subphylum, the codon bias of large numbers of genes in the majority of genomes is influenced by translational selection.

Research Organization:
Great Lakes Bioenergy Research Center (GLBRC), Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE
Contributing Organization:
Vanderbilt Univ., Nashville, TN (United States). Advanced Computing Center for Research and Education
Grant/Contract Number:
SC0018409
OSTI ID:
1630383
Alternate ID(s):
OSTI ID: 1579355
Journal Information:
PLoS Genetics, Vol. 15, Issue 7; ISSN 1553-7404
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 49 works
Citation information provided by
Web of Science

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A General Model of Codon Bias Due to GC Mutational Bias journal October 2010
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Tempo and mode of genome evolution in the budding yeast subphylum dataset January 2018
Synonymous codon usage in Bacillus subtilis reflects both translational selection and mutational biases journal January 1987
EF-P Is Essential for Rapid Synthesis of Proteins Containing Consecutive Proline Residues journal December 2012
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Selection Conflicts, Gene Expression, and Codon Usage Trends in Yeast journal July 2003
Expression pattern and, surprisingly, gene length shape codon usage in Caenorhabditis, Drosophila, and Arabidopsis journal April 1999
Understanding the contribution of synonymous mutations to human disease journal August 2011
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Codon choice and gene expression: synonymous codons differ in their ability to direct aminoacylated-transfer RNA binding to ribosomes in vitro. journal June 1988
Codon Optimality Is a Major Determinant of mRNA Stability journal March 2015
How Optimized Is the Translational Machinery in Escherichia coli, Salmonella typhimurium and Saccharomyces cerevisiae? journal May 1998
In Vivo Introduction of Unpreferred Synonymous Codons Into the Drosophila Adh Gene Results in Reduced Levels of ADH Protein journal January 2003
GC-Content Evolution in Mammalian Genomes: The Biased Gene Conversion Hypothesis journal October 2001
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