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Viral RNA blocks circularization to evade host codon usage control.

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Viruses evade host gene expression control by blocking mRNA circularization. This allows efficient viral protein translation despite non-optimal codon usage, aiding disease and pandemic spread.

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Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • Codon usage bias influences gene expression levels across species.
  • Human-infecting viruses exhibit distinct codon usage patterns compared to host genes.
  • Efficient viral protein expression despite codon bias suggests evasion mechanisms.

Purpose of the Study:

  • Investigate the mechanism by which viruses evade host codon usage control.
  • Determine the role of viral 5' untranslated regions (UTRs) in translation regulation.
  • Elucidate the impact of mRNA circularization on viral translation efficiency.

Main Methods:

  • Comparative analysis of viral and host gene translation.
  • Functional studies using viral replicons and 5' UTRs.
  • Investigating the effect of mRNA circularization on codon usage-dependent translation.

Main Results:

  • Viral proteins face codon usage control when translated as host-like mRNAs.
  • Viral 5' UTRs enable codon-usage-insensitive translation from viral replicons.
  • Blocking mRNA circularization by viral RNAs allows efficient translation despite poor codon usage.

Conclusions:

  • Viral 5' UTRs are key mediators of translation evasion.
  • mRNA circularization is essential for initiating codon-usage-dependent translation.
  • Viruses bypass host translation control by inhibiting mRNA circularization, facilitating pathogenesis.