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Area of Science:

  • Molecular Biology
  • RNA Modifications
  • Genomics

Background:

  • N4-acetylcytidine (ac4C) is an ancient RNA modification found in tRNA and rRNA.
  • Its presence and function in eukaryotic mRNA are not fully understood.
  • Cytidine acetylation dynamics require further investigation.

Purpose of the Study:

  • To develop a method for transcriptome-wide mapping of ac4C.
  • To investigate the distribution and function of ac4C in different organisms.
  • To explore the role of ac4C in thermoadaptation.

Main Methods:

  • Development of ac4C-seq, a chemical genomic technique.
  • Quantitative mapping of ac4C at single-nucleotide resolution.
  • Cross-evolutionary profiling and cryo-electron microscopy.

Main Results:

  • ac4C is absent in human and yeast mRNA but can be induced.
  • Hyperthermophilic archaea exhibit high levels of ac4C across various RNA types.
  • ac4C levels increase with temperature, and its absence causes growth defects.

Conclusions:

  • ac4C plays a significant role in RNA, particularly in thermoadaptation in archaea.
  • The ac4C landscape is quantitatively defined, offering a foundation for future research.
  • This modification's role in biology and disease warrants further study.