High Transcriptional Error Rates Vary as a Function of Gene Expression Level

Kendra M. Meer, Paul G. Nelson, Kun Xiong, Joanna Masel

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Errors in gene transcription can be costly, and organisms have evolved to prevent their occurrence or mitigate their costs. The simplest interpretation of the drift barrier hypothesis suggests that species with larger population sizes would have lower transcriptional error rates. However, Escherichia coli seems to have a higher transcriptional error rate than species with lower effective population sizes, for example Saccharomyces cerevisiae. This could be explained if selection in E. coli were strong enough to maintain adaptations that mitigate the consequences of transcriptional errors through robustness, on a gene by gene basis, obviating the need for low transcriptional error rates and associated costs of global proofreading. Here, we note that if selection is powerful enough to evolve local robustness, selection should also be powerful enough to locally reduce error rates. We therefore predict that transcriptional error rates will be lower in highly abundant proteins on which selection is strongest. However, we only expect this result when error rates are high enough to significantly impact fitness. As expected, we find such a relationship between expression and transcriptional error rate for non-C→U errors in E. coli (especially G→A), but not in S. cerevisiae. We do not find this pattern for C→U changes in E. coli, presumably because most deamination events occurred during sample preparation, but do for C→U changes in S. cerevisiae, supporting the interpretation that C→U error rates estimated with an improved protocol, and which occur at rates comparable with E. coli non-C→U errors, are biological.

Original languageEnglish (US)
Pages (from-to)3754-3761
Number of pages8
JournalGenome biology and evolution
Volume12
Issue number1
DOIs
StatePublished - Dec 16 2019

Keywords

  • Cir-Seq
  • nearly neutral theory
  • phenotypic mutation
  • RNA editing
  • weak selection

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics

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