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An Easy Method for Plant Polysome Profiling
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Polysome propensity and tunable thresholds in coding sequence length enable differential mRNA stability.

Sayanur Rahaman1, Simone Faravelli1, Sylvia Voegeli1

  • 1Biozentrum, University of Basel, Spitalstrasse 41, 4056 Basel, Switzerland.

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|September 27, 2023
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Summary
This summary is machine-generated.

mRNA stability and translation are coupled, but this link depends on coding sequence length. Yeast mRNA stability gains from optimal codons only appear above a critical length, influenced by untranslated regions.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Codon optimality influences mRNA translation and stability, suggesting a coupled regulatory mechanism.
  • The precise regulation and length-dependent nature of this coupling remain largely uncharacterized.

Purpose of the Study:

  • To investigate the role of mRNA coding sequence length in the coupling of translation and degradation.
  • To explore how untranslated regions (UTRs) modulate this length-dependent stability.

Main Methods:

  • Utilized yeast as a model organism.
  • Analyzed mRNA stability and translation efficiency in relation to coding sequence length.
  • Investigated the impact of UTRs on mRNA stability and translation.

Main Results:

  • A critical coding sequence length threshold was identified in yeast.
  • Above this threshold, codon optimality significantly enhanced mRNA stability and polysome association.
  • Below the threshold, codon optimality had minimal impact on mRNA stability, despite efficient translation.
  • Specific UTRs were found to destabilize mRNAs without affecting translation, impacting cell cycle gene oscillations.

Conclusions:

  • mRNA stability and translation coupling exhibit a switch-like dependence on coding sequence length.
  • UTRs play a crucial role in fine-tuning mRNA stability and gene expression dynamics.
  • Findings provide insights into short peptide translation and neuronal mRNA regulation.