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Analysis of Translation Initiation During Stress Conditions by Polysome Profiling
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Translation elongation inhibitors stabilize select short-lived transcripts.

Nicolle A Rosa-Mercado1, Allen R Buskirk1, Rachel Green2,3

  • 1Johns Hopkins University School of Medicine, Department of Molecular Biology & Genetics, Baltimore, Maryland 21205, USA.

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PubMed
Summary
This summary is machine-generated.

Translation elongation inhibitors reveal a subset of short-lived mRNAs, many encoding C2H2 zinc finger proteins, that are stabilized under translational stress. This stabilization is independent of ribosome quality control mechanisms.

Keywords:
codon optimalitymRNA stabilityribosome collisionstranslation elongation

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Translation elongation inhibitors are vital tools for probing cellular functions.
  • However, their precise effects on transcription and mRNA decay remain incompletely understood.
  • Assessing these impacts is crucial for interpreting experimental results accurately.

Purpose of the Study:

  • To investigate the influence of translational stress on mRNA dynamics in human cells using TimeLapse sequencing.
  • To identify specific transcripts stabilized by the translation elongation inhibitor emetine.
  • To elucidate the mechanisms underlying this mRNA stabilization.

Main Methods:

  • Utilized TimeLapse sequencing to monitor mRNA dynamics under translational stress.
  • Employed emetine as a translation elongation inhibitor in human cell models.
  • Analyzed transcript stability, codon usage, and dependence on ribosome quality control factors.

Main Results:

  • A specific subset of short-lived transcripts was found to be stabilized upon emetine treatment.
  • Many of these stabilized mRNAs encode C2H2 zinc finger proteins.
  • Suboptimal codon usage characterized these stabilized transcripts compared to other mRNAs.
  • Stabilization occurred independently of ribosome quality control and ribosome collision pathways.

Conclusions:

  • Emetine treatment reveals a novel mechanism of mRNA stabilization linked to translation elongation inhibition.
  • Short-lived mRNAs encoding C2H2 zinc finger proteins are particularly sensitive to impaired translation elongation.
  • These findings offer new insights into mRNA decay regulation and the cellular response to translational stress.