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Updated: Jun 5, 2026
09:33
Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules
Published on: May 12, 2017
TSC2 is a stress granule suppressor.
Yizhe Ma1, Natalie G Farny1,2
1Department of Biology and Biotechnology, Worcester Polytechnic Institute, Worcester, MA, USA.
Biorxiv : the Preprint Server for Biology
|June 4, 2026
Summary
Tsc2 loss causes spontaneous stress granules (SGs) via mTORC1. Reduced Tsc2 levels increase stress sensitivity, highlighting Tsc2
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Stress granules (SGs) are dynamic ribonucleoprotein assemblies crucial for cellular proteostasis during stress.
- Liquid-liquid phase separation drives SG formation, enabling cells to survive adverse conditions.
Purpose of the Study:
- To identify novel conserved regulators of stress granule dynamics.
- To investigate the role of Tsc2 in stress granule formation and clearance.
Main Methods:
- Reanalysis of a *Drosophila* genome-wide RNAi screen to identify SG suppressor genes.
- Validation of Tsc2 in mouse embryonic fibroblasts (MEFs) and human cell lines.
- Assessment of SG formation, clearance, and cellular stress responses in Tsc2-deficient models.
Main Results:
- Complete loss of Tsc2 in MEFs induced spontaneous, translation-dependent SGs, linked to mTORC1 hyperactivation.
- Tsc2-deficient MEFs exhibited increased sensitivity to endoplasmic reticulum stress, with delayed SG clearance.
- Partial TSC2 reduction in human cells did not cause spontaneous SGs but correlated stress sensitivity and clearance delays with remaining TSC2 levels.
Conclusions:
- TSC2 acts as a threshold-dependent regulator of SG assembly.
- Tsc2 is a key regulator of stress granule dynamics, influencing cellular responses to various stressors.
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