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Title: Evolutionary instability of CUG-Leu in the genetic code of budding yeasts

Journal Article · · Nature Communications
 [1];  [1]; ORCiD logo [2];  [2]; ORCiD logo [3];  [3];  [4]; ORCiD logo [5]; ORCiD logo [1];  [1];  [6]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [1]
  1. Univ. College Dublin (Ireland)
  2. Vanderbilt Univ., Nashville, TN (United States)
  3. Univ. of Wisconsin, Madison, WI (United States)
  4. Amyris, Emeryville, CA (United States); USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  5. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  6. Dept. of Agriculture, Peoria, IL (United States). Agricultural Research Station

The genetic code used in nuclear genes is almost universal, but here we report that it changed three times in parallel during the evolution of budding yeasts. All three changes were reassignments of the codon CUG, which is translated as serine (in 2 yeast clades), alanine (1 clade), or the 'universal' leucine (2 clades). The newly discovered Ser2 clade is in the final stages of a genetic code transition. Most species in this clade have genes for both a novel tRNASer(CAG) and an ancestral tRNALeu(CAG) to read CUG, but only tRNASer(CAG) is used in standard growth conditions. The coexistence of these alloacceptor tRNA genes indicates that the genetic code transition occurred via an ambiguous translation phase. We propose that the three parallel reassignments of CUG were not driven by natural selection in favor of their effects on the proteome, but by selection to eliminate the ancestral tRNALeu(CAG).

Research Organization:
Univ. of Wisconsin, Madison, WI (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
FC02-07ER64494; AC02-05CH11231
OSTI ID:
1500012
Alternate ID(s):
OSTI ID: 1619100
Journal Information:
Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 42 works
Citation information provided by
Web of Science

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Cited By (15)

The reported point centromeres of Scheffersomyces stipitis are retrotransposon long terminal repeats journal January 2019
Identification of an Exceptionally Long Intron in the HAC1 Gene of Candida parapsilosis journal November 2018
Variation and selection on codon usage bias across an entire subphylum journal July 2019
Evolution and Unprecedented Variants of the Mitochondrial Genetic Code in a Lineage of Green Algae journal October 2019
Development of a Transformation Method for Metschnikowia borealis and other CUG-Serine Yeasts journal January 2019
Cyanase-independent utilization of cyanate as a nitrogen source in ascomycete yeasts journal December 2018
Fungal acetylome comparative analysis identifies an essential role of acetylation in human fungal pathogen virulence journal May 2019
Rapid Genetic Code Evolution in Green Algal Mitochondrial Genomes journal January 2019
The Methylotroph Gene Order Browser (MGOB) reveals conserved synteny and ancestral centromere locations in the yeast family Pichiaceae journal August 2019
Multi-omics characterization of the necrotrophic mycoparasite Saccharomycopsis schoenii journal May 2019
A genomic survey of nitrogen assimilation pathways in budding yeasts (sub-phylum Saccharomycotina) journal December 2018
Population genomics shows no distinction between pathogenic Candida krusei and environmental Pichia kudriavzevii: One species, four names journal July 2018
Highlight: Recracking the Genetic Code journal October 2019
Genetic Modification of Closely Related Candida Species journal March 2019
Chromatin-Mediated Regulation of Genome Plasticity in Human Fungal Pathogens journal October 2019

Figures / Tables (4)


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