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Comparative RNA Structure Analysis of Nascent and Mature Transcripts in Saccharomyces cerevisiae
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The impact of RNA structure on coding sequence evolution in both bacteria and eukaryotes.

Wanjun Gu1, Musheng Li, Yuming Xu

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RNA secondary structures influence coding sequence evolution. Nucleotide sites sensitive to structural disruption evolve more slowly, especially in highly expressed genes.

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Bioinformatics

Background:

  • Functional RNA secondary structures are known to be conserved across species.
  • The impact of RNA structure selection on the evolution of coding sequences is not well understood.

Purpose of the Study:

  • To investigate the relationship between nucleotide conservation and structural sensitivity in coding sequences.
  • To determine if RNA structure influences the rate of coding sequence evolution.

Main Methods:

  • Defining structurally sensitive sites based on potential structure-disruptive mutations.
  • Utilizing the Mantel-Haenszel procedure and association tests.
  • Analyzing data from four model organisms: Escherichia coli, yeast, fly, and mouse.

Main Results:

  • Structurally sensitive nucleotide sites exhibit slower evolution compared to non-sensitive sites across all studied organisms.
  • This slower evolution is more pronounced in highly expressed genes and regions near the start codon.
  • Evidence suggests RNA structure plays a significant role in constraining coding sequence evolution.

Conclusions:

  • Structurally sensitive sites in messenger RNA (mRNA) sequences demonstrate reduced nucleotide divergence across analyzed species.
  • This finding enhances the understanding of RNA structure's influence on coding sequence evolution.
  • The results can inform the development of codon models incorporating RNA structure information.