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Measurements of Physiological Stress Responses in C. Elegans
Published on: May 21, 2020
Dynamic network topology changes in functional modules predict responses to oxidative stress in yeast
Peddinti V Gopalacharyulu1, Vidya R Velagapudi, Erno Lindfors
1VTT Technical Research Centre of Finland, P.O. Box 1000, Espoo, FI-02044 VTT, Finland.
Molecular Biosystems
|February 20, 2009
Summary
Biological networks dynamically adapt to environmental stress, potentially causing system failure. Our new method, TEAFS, analyzes these network changes to predict stress responses and identify key proteins like IFA38 involved in lipid accumulation.
Area of Science:
- Systems Biology
- Molecular Biology
- Biochemistry
Background:
- Biological systems adapt to environmental challenges through dynamic changes to maintain function.
- These adaptations can lead to cumulative stress and potential system failure, necessitating a system-wide, dynamic understanding.
- Changes in the topology of functional modules within integrated biological networks likely reflect activity under specific environmental conditions.
Purpose of the Study:
- To hypothesize that dynamic topological changes in functional modules of integrated biological networks indicate activity under environmental stress.
- To introduce Topological Enrichment Analysis of Functional Subnetworks (TEAFS) for analyzing integrated molecular profiles and interactome data.
- To validate TEAFS using comprehensive metabolomic analysis of yeast's dynamic response to oxidative stress.
Main Methods:
- Development and application of Topological Enrichment Analysis of Functional Subnetworks (TEAFS).
- Integration of molecular profile and interactome data.
- Validation through comprehensive metabolomic analysis of dynamic yeast response to oxidative stress.
Main Results:
- TEAFS identified activation of stress response mechanisms, including lipid metabolism and phospholipid biosynthesis.
- A key protein, fatty acid elongase IFA38, was identified as a hub protein absent during oxidative stress.
- Metabolomic analysis confirmed increased concentrations of ceramides and palmitic acid, consistent with IFA38 deletion mutant phenotypes.
Conclusions:
- Dynamic modulation of biological network connectivity occurs in response to oxidative stress, leading to the accumulation of lipotoxic lipids like ceramides.
- TEAFS can investigate and predict biological process activity and system responses to environmental challenges and interventions.
- Understanding local network topology dynamics is crucial for comprehending system resilience and failure.
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