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Related Concept Videos

Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

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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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Nuclear Export of mRNA02:31

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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Improving Translational Accuracy02:07

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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...
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Termination of Translation01:44

Termination of Translation

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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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Translational Regulation01:29

Translational Regulation

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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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Transcription Attenuation in Prokaryotes02:42

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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
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Updated: Sep 16, 2025

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs
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Stop codon context modulates NMD efficiency through translation termination kinetics.

Dasa Longman1, Laura Monaghan1, Javier F Cáceres1

  • 1MRC Human Genetics Unit, Institute of Genetics and Cancer, University of Edinburgh, Crewe Road South, Edinburgh EH4 2XU, UK.

Cell Genomics
|July 10, 2025
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Summary
This summary is machine-generated.

Glycine residues before stop codons enhance nonsense-mediated mRNA decay (NMD). This finding explains NMD variability and aids in interpreting genetic variants, improving diagnostic accuracy.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Nonsense-mediated mRNA decay (NMD) is a surveillance pathway that degrades aberrant mRNAs with premature termination codons (PTCs).
  • The efficiency of NMD varies significantly across different transcripts, leading to unpredictable outcomes in gene expression.
  • Understanding the factors influencing NMD efficiency is crucial for interpreting genetic variants and disease mechanisms.

Purpose of the Study:

  • To investigate the mechanistic basis for the variable efficiency of nonsense-mediated mRNA decay (NMD).
  • To identify specific sequence features that modulate NMD activity at premature termination codons (PTCs).
  • To provide a framework for improved interpretation of genetic variants associated with PTCs.

Main Methods:

  • Analysis of mRNA decay rates in cells expressing transcripts with varying upstream sequences.
  • Site-directed mutagenesis to alter amino acid residues preceding stop codons.
  • Reporter assays to quantify NMD activity.

Main Results:

  • Glycine residues immediately upstream of stop codons were found to significantly enhance NMD efficiency.
  • These glycine residues promote the formation of an extended translation termination complex.
  • This extended window increases the likelihood of NMD engagement.

Conclusions:

  • The presence of glycine residues preceding stop codons is a key determinant of NMD efficiency.
  • This mechanism provides a novel explanation for the observed variability in NMD activity.
  • These findings have direct implications for the clinical interpretation of genetic variants, particularly those creating PTCs.