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Genomic factors shaping codon usage across the Saccharomycotina subphylum

Journal Article · · G3
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [6];  [5];  [10]
  1. University of North Carolina at Charlotte, Kannapolis, NC (United States); U.S. Food and Drug Administration, Silver Spring, MD (United States)
  2. University of North Carolina at Charlotte, Kannapolis, NC (United States)
  3. SUNY Oswego, NY (United States); University of Wisconsin–Madison, WI (United States)
  4. Villianova University, PA (United States); University of Wisconsin-Madison, WI (United States)
  5. Vanderbilt University, Nashville, TN (United States)
  6. University of Wisconsin-Madison, WI (United States)
  7. Zhejiang University, Hangzhou (China)
  8. South China Agricultural University, Guangzhou (China)
  9. Westerdijk Fungal Biodiversity Institute, Utrecht (The Netherlands)
  10. University of North Carolina at Charlotte, Kannapolis, NC (United States); University of North Carolina at Charlotte, Charlotte, NC (United States)

Codon usage bias, or the unequal use of synonymous codons, is observed across genes, genomes, and between species. It has been implicated in many cellular functions, such as translation dynamics and transcript stability, but can also be shaped by neutral forces. We characterized codon usage across 1,154 strains from 1,051 species from the fungal subphylum Saccharomycotina to gain insight into the biases, molecular mechanisms, evolution, and genomic features contributing to codon usage patterns. We found a general preference for A/T-ending codons and correlations between codon usage bias, GC content, and tRNA-ome size. Codon usage bias is distinct between the 12 orders to such a degree that yeasts can be classified with an accuracy >90% using a machine learning algorithm. We also characterized the degree to which codon usage bias is impacted by translational selection. We found it was influenced by a combination of features, including the number of coding sequences, BUSCO count, and genome length. Our analysis also revealed an extreme bias in codon usage in the Saccharomycodales associated with a lack of predicted arginine tRNAs that decode CGN codons, leaving only the AGN codons to encode arginine. Analysis of Saccharomycodales gene expression, tRNA sequences, and codon evolution suggests that avoidance of the CGN codons is associated with a decline in arginine tRNA function. Consistent with previous findings, codon usage bias within the Saccharomycotina is shaped by genomic features and GC bias. However, we find cases of extreme codon usage preference and avoidance along yeast lineages, suggesting additional forces may be shaping the evolution of specific codons.

Research Organization:
Great Lakes Bioenergy Research Center (GLBRC), Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)
Grant/Contract Number:
SC0018409
OSTI ID:
2473237
Journal Information:
G3, Journal Name: G3 Journal Issue: 11 Vol. 14; ISSN 2160-1836
Publisher:
Genetics Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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