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Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis
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RNA-DNA sequence differences in Saccharomyces cerevisiae.

Isabel X Wang1, Christopher Grunseich2, Youree G Chung3

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RNA editing, previously thought limited to tRNAs in yeast, is widespread in Saccharomyces cerevisiae mRNA. These RNA-DNA sequence differences diversify proteins and are linked to R-loop regulation.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • RNA editing and alternative splicing generate transcript diversity from DNA.
  • RNA editing was previously believed to occur only in transfer RNAs (tRNAs) in yeast.
  • The full spectrum and implications of RNA editing in yeast remained largely unexplored.

Purpose of the Study:

  • To investigate the presence and types of RNA-DNA sequence differences (RDDs) in Saccharomyces cerevisiae mRNA.
  • To determine if RDDs impact protein sequences.
  • To explore the relationship between RDDs, R-loops, and cellular factors.

Main Methods:

  • Utilized deep sequencing to identify all 12 types of RDDs in yeast mRNA.
  • Analyzed peptide sequences to confirm RNA-templated protein synthesis at RDD sites.
  • Conducted a mutant screen focusing on genes involved in R-loop regulation.
  • Assessed RDD frequency in mutants with altered RNA-DNA hybrid resolution (e.g., ribonuclease H, senataxin, topoisomerase I).

Main Results:

  • Identified all 12 types of RDDs in Saccharomyces cerevisiae mRNA, challenging previous assumptions.
  • Demonstrated that RDDs lead to the production of peptides encoded by RNA sequences, not just DNA.
  • Found a significant enrichment of RDDs in R-loop regions.
  • Showed that mutations affecting R-loop resolution, particularly loss-of-function mutations in RNase H, senataxin, and Topoisomerase I, increase RDD frequency.

Conclusions:

  • RNA-DNA sequence differences (RDDs) are a conserved mechanism for transcriptomic and proteomic diversification in yeast.
  • RDDs are mechanistically linked to R-loops, with R-loop resolving factors influencing RDD formation.
  • This study expands the known landscape of RNA editing in yeast and its connection to genome stability and regulation.