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Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism
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Discovering Genetic Modulators of the Protein Homeostasis System through Multilevel Analysis.

Vishal Sarsani1, Berent Aldikacti2, Tingting Zhao3,4

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|March 11, 2024
PubMed
Summary

Understanding protein homeostasis requires analyzing how genetic and environmental factors impact cellular fitness. This study reveals that genetic background influences essential genes more than environmental conditions, with dissimilar perturbations causing synergistic growth defects.

Keywords:
conditionally essential networksfitnessproteotoxic stresstransposon mutagenesis

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Area of Science:

  • Microbiology
  • Systems Biology
  • Genetics

Background:

  • Protein homeostasis is crucial for cellular function, coordinating protein lifecycles through various pathways.
  • Understanding how these pathways respond to environmental and genetic stresses is key to comprehending organismal resilience.
  • The fitness landscape, representing the impact of genetic and environmental changes on organism survival, is a critical concept in evolutionary biology.

Approach:

  • Utilized directed and massively parallel transposon mutagenesis in Caulobacter crescentus to investigate gene-by-environment interactions.
  • Developed a computational pipeline integrating general linear models (GLMs), statistical knockoffs, and Bayesian models for robust analysis.
  • Quantified the similarity of proteotoxic environmental perturbations by analyzing changes in the fitness landscape.

Key Points:

  • Essential genes showed greater variation based on genetic background than environmental conditions.
  • Limited overlap was observed among mutant strains affecting different aspects of protein homeostasis.
  • Identified 146 unique fitness determinants, with 19 genes common across multiple strains, exhibiting varied resilience to proteotoxic stress.

Conclusions:

  • Genetic perturbations significantly shape the fitness landscape, with effects often outweighing environmental influences.
  • Dissimilar perturbations, when combined, can lead to synergistic negative impacts on cellular growth.
  • This research provides a framework for dissecting complex gene-environment interactions in maintaining protein homeostasis.