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Nonsense-mediated mRNA Decay

Nonsense-mediated mRNA Decay

The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
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Nonsense-mediated mRNA Decay

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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...

Transcriptional Regulation: Riboswitches

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Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...

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Related Experiment Video

Updated: Jan 13, 2026

De novo Identification of Actively Translated Open Reading Frames with Ribosome Profiling Data

De novo Identification of Actively Translated Open Reading Frames with Ribosome Profiling Data

Published on: February 18, 2022

Feedback from the Nascent Chain Triggers Ribosomal Frameshifting and Transcript Decay.

Patrick J Carmody¹, Caden R Sillman², Dyotima¹

¹Department of Chemistry, Indiana University Bloomington, Bloomington, IN, USA.

Biorxiv : the Preprint Server for Biology

|January 9, 2026

Summary

Nascent polypeptide misassembly, such as during transmembrane domain translocation, can trigger -1 programmed ribosomal frameshifting (-1PRF). This process also influences mRNA decay, impacting gene expression regulation.

Keywords:

Alternative Splicing GPCR Ion Channel Membrane Protein Folding Nonsense-Mediated Decay Programmed Ribosomal Frameshifting Proteostasis Ribosome Translation Translocon

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Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

Ribosomes possess safeguards to maintain translational reading frame fidelity.
Programmed ribosomal frameshifting (-1PRF) can bypass these safeguards, particularly -1PRF.
Nascent polypeptide conformation's role in -1PRF is not fully understood.

Purpose of the Study:

To investigate if nascent transmembrane domain translocation induces -1PRF.
To identify motifs triggering -1PRF and associated frameshift products.
To explore the link between splicing, transmembrane domains, -1PRF, and mRNA decay.

Main Methods:

Experimental induction of -1PRF by nascent transmembrane domain translocation.
Proteomic analysis to identify frameshift products.
Analysis of splicing-dependent motifs and their effect on -1PRF.
Assessment of mRNA decay sensitivity to UPF1.

Main Results:

Transmembrane domain translocation is sufficient to induce -1PRF on slippery heptamers.
Thousands of motifs potentially triggering -1PRF were identified, with 33 human frameshift products confirmed.
Splicing-mediated changes in transmembrane domains alter -1PRF.
Most identified transcripts are sensitive to UPF1, indicating modulation of mRNA turnover.

Conclusions:

Polypeptide misassembly, including transmembrane domain formation, can trigger -1PRF.
This mechanism links polypeptide synthesis errors to translational recoding and mRNA decay.
Findings suggest a novel regulatory pathway involving nascent polypeptide structure, frameshifting, and mRNA stability.