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Updated: May 22, 2025

Measurement of mRNA Decay Rates in Saccharomyces cerevisiae Using rpb1-1 Strains
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Systematic analysis of nonsense variants uncovers peptide release rate as a novel modifier of nonsense-mediated mRNA

Divya Kolakada1, Rui Fu2, Nikita Biziaev3

  • 1Department of Biochemistry and Molecular Genetics, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045, USA; Molecular Biology Graduate Program, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045, USA.

Cell Genomics
|May 20, 2025
PubMed

Insights

Nonsense variants

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Nonsense variants cause premature termination codons (PTCs), leading to mRNA degradation via nonsense-mediated mRNA decay (NMD).
  • Understanding factors influencing NMD activity is crucial for interpreting the clinical impact of nonsense variants.
  • Variations in NMD efficiency based on transcript and context remain poorly understood.

Purpose of the Study:

  • To investigate how sequence context, specifically the amino acid preceding a PTC, affects NMD activity.
  • To elucidate the role of translation termination dynamics in modulating NMD efficiency.
  • To develop a mechanistic framework for better clinical interpretation of nonsense variants.

Main Methods:

  • Analysis of amino acid preceding PTCs in relation to NMD efficiency.
  • Investigating the enrichment and depletion patterns of specific codons (e.g., glycine) before PTCs and normal termination codons.
  • Assessing the impact of peptide release rate during translation termination on NMD activity.

Main Results:

  • The amino acid preceding a PTC significantly influences NMD activity.
  • Glycine codons strongly promote NMD efficiency and are enriched before PTCs, especially in genes tolerant to loss-of-function.
  • Translation termination kinetics, including peptide release rate, are key determinants of NMD activity, supporting a "window of opportunity" model.

Conclusions:

  • Sequence context, particularly the preceding amino acid and translation termination dynamics, critically shapes NMD activity.
  • Findings provide a mechanistic understanding of how NMD efficiency varies.
  • This work offers a framework for improved clinical interpretation of genetic variants causing PTCs.
Keywords:
NMDPTCloss-of-functionnonsense mutationsplicingterminationtranslation

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