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Related Concept Videos

Improving Translational Accuracy02:07

Improving Translational Accuracy

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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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Nonsense-mediated mRNA Decay02:27

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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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Regulation of Expression Occurs at Multiple Steps02:24

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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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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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Regulation of Expression at Multiple Steps01:23

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Initiation of Translation02:33

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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
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Updated: Jul 18, 2025

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs
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Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

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Translation-coupled mRNA quality control mechanisms.

Laura Monaghan1, Dasa Longman1, Javier F Cáceres1

  • 1MRC Human Genetics Unit, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, UK.

The EMBO Journal
|August 22, 2023
PubMed
Summary
This summary is machine-generated.

mRNA surveillance pathways ensure accurate gene expression and protein production. Understanding these quality control mechanisms, like nonsense-mediated decay, is crucial for cellular health and disease research.

Keywords:
No-go mRNA decayNon-stop mRNA decayNonsense-mediated mRNA decayRNA quality controlUPF1

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • mRNA surveillance pathways are critical for maintaining cellular homeostasis.
  • These pathways ensure the production of functional proteins by eliminating aberrant mRNAs.

Purpose of the Study:

  • To review translation-coupled mRNA quality control mechanisms.
  • To highlight advances in understanding nonsense-mediated mRNA decay (NMD).

Main Methods:

  • Review of existing literature on mRNA decay pathways.
  • Analysis of mechanisms, factors, and physiological roles of mRNA quality control.

Main Results:

  • Detailed description of non-stop and no-go mRNA decay pathways.
  • Recent mechanistic findings and novel factors in nonsense-mediated mRNA decay (NMD).

Conclusions:

  • mRNA quality control is vital for accurate gene expression and preventing disease.
  • Further research into NMD and other pathways offers insights into cellular function and pathology.