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The Meaning of NMD: Translate or Perish

Saverio Brogna1, Tina McLeod1, Marija Petric1

  • 1University of Birmingham, School of Biosciences, Edgbaston, Birmingham, B15 2TT, UK.

Trends in Genetics : TIG
|May 18, 2016
PubMed

Insights

Cells may not have a specific mechanism for nonsense-mediated mRNA decay (NMD). Instead, reduced mRNA levels could result from unprotected mRNA sequences, challenging the current understanding of NMD.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Premature translation termination reduces mRNA levels across organisms.
  • Nonsense-mediated mRNA decay (NMD) is a eukaryotic surveillance mechanism.
  • NMD is thought to be triggered by premature termination codons (PTCs) in specific contexts.

Purpose of the Study:

  • To investigate the mechanism by which cells discriminate between premature termination codons (PTCs) and normal stop codons.
  • To propose an alternative model for mRNA depletion caused by premature translation termination.

Main Methods:

  • The study proposes a new theoretical model.
  • It re-evaluates existing knowledge on NMD and mRNA decay pathways.

Main Results:

  • The study challenges the existence of a specific NMD surveillance mechanism.
  • It suggests that mRNA depletion is a consequence of unprotected mRNA tracts.

Conclusions:

  • Cells may not actively surveil for PTCs to degrade mRNA.
  • mRNA depletion is proposed to be an outcome of ribosomes failing to protect long mRNA sequences.
Keywords:
3′-UTREJCmRNA quality controlmRNA surveillanceribosometranslation

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