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Related Experiment Video

Updated: Feb 12, 2026

Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules
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Systematic Characterization of Stress-Induced RNA Granulation.

Sim Namkoong1, Allison Ho1, Yu Mi Woo2

  • 1Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA.

Molecular Cell
|March 27, 2018
PubMed
Summary

Stress granules sequester only a small subset of messenger RNAs (mRNAs), particularly those with longer lengths and AU-rich elements, which are crucial for cell survival. This finding offers new insights into ribonucleoprotein (RNP) granule dynamics during cellular stress.

Keywords:
AU-rich elementsER stressRNA-seqRNP granulearsenite toxicityheat shockstress granuletranscriptome

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Cytoplasmic messenger RNAs (mRNAs) form insoluble ribonucleoprotein (RNP) granules, like stress granules (SGs), upon cellular stress.
  • The dynamic redistribution of mRNA during stress has been underestimated, partly due to the assumption of bulk recruitment to SGs.

Purpose of the Study:

  • To characterize the dynamic redistribution of mRNA into RNP granules under stress conditions.
  • To identify specific features of mRNAs targeted to insoluble RNP granules (RG).

Main Methods:

  • Transcriptome profiling of insoluble RNP granule (RG) fractions under various stress conditions (ER stress, heat shock, arsenite toxicity).
  • Bioinformatic analysis to identify sequence motifs and characteristics of targeted mRNAs.

Main Results:

  • Endoplasmic reticulum (ER) stress selectively targets a small subset of translationally suppressed mRNAs into the RG fraction.
  • This targeted mRNA subset is characterized by extended length and AU-rich motifs, and is enriched for cell survival and proliferation genes.
  • Similar RG targeting patterns were observed for heat shock and arsenite toxicity, with stress-specific motifs like GC-rich elements identified in heat shock.

Conclusions:

  • Selective mRNA targeting to RNP granules is a key feature of cellular stress responses.
  • The characteristics of targeted mRNAs (length, motifs) suggest a functional role in cellular adaptation and survival.
  • Transcriptome profiling of RGs provides valuable insights into diseases linked to RNP dysfunction, including cancer and neurodegeneration.