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Updated: Jul 5, 2025

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Systematic analysis of nonsense variants uncovers peptide release rate as a novel modifier of nonsense-mediated mRNA

Divya Kolakada1,2, Rui Fu3, Nikita Biziaev4

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

Biorxiv : the Preprint Server for Biology
|January 23, 2024
PubMed

Insights

The amino acid before a premature stop codon significantly impacts nonsense-mediated mRNA decay (NMD). Glycine codons enhance NMD, aiding in the degradation of faulty transcripts and improving genetic disease variant interpretation.

Area of Science:

  • Genetics
  • Molecular Biology
  • Biochemistry

Background:

  • Nonsense variants cause genetic diseases by introducing premature termination codons (PTCs).
  • Nonsense-mediated mRNA decay (NMD) degrades transcripts with PTCs, influencing disease severity.
  • Factors controlling NMD activity and its context-dependent variations are not fully understood.

Purpose of the Study:

  • To investigate how sequence context, specifically the preceding amino acid, influences NMD activity.
  • To elucidate the mechanistic link between translation termination and NMD efficiency.
  • To develop a framework for better clinical interpretation of nonsense variants.

Main Methods:

  • Analysis of human genetic datasets to identify patterns of amino acid enrichment before PTCs.
  • Biochemical assays to measure peptide release rates during translation termination.
  • Massively parallel reporter assays to assess NMD efficiency in response to sequence context.

Main Results:

  • The amino acid preceding a PTC is a major determinant of NMD activity.
  • Glycine codons strongly promote NMD efficiency and are enriched before PTCs.
  • Translation termination peptide release rates vary with preceding amino acid identity, correlating with NMD activity.

Conclusions:

  • Translation termination kinetics, influenced by the preceding amino acid, modulate NMD efficiency via a "window of opportunity" model.
  • Findings provide a mechanistic understanding of how sequence context affects NMD.
  • This knowledge can improve the clinical interpretation of genetic variants with PTCs.
Keywords:
NMDPTCsplicingterminationtranslation

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