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Protein Networks

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Related Experiment Video

Updated: May 30, 2026

Divergence of Root Microbiota in Different Habitats based on Weighted Correlation Networks

Divergence of Root Microbiota in Different Habitats based on Weighted Correlation Networks

Published on: September 25, 2021

Biological interaction networks are conserved at the module level.

Guy E Zinman¹, Shan Zhong, Ziv Bar-Joseph

¹Lane Center for Computational Biology, School of Computer Science, Carnegie Mellon University, Pittsburgh, PA 15213, USA.

BMC Systems Biology

|August 25, 2011

Summary

This summary is machine-generated.

Protein interaction data is conserved at the module level, not just between species. Interactions within functional modules are conserved more than those connecting different modules, explaining conserved biological processes.

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Area of Science:

Systems Biology
Comparative Genomics
Network Biology

Background:

Orthologous genes are conserved across species, but protein interaction data shows lower conservation than expected, even for similar sequences.
Previous studies comparing high-throughput interaction data (expression, protein-protein, protein-DNA, genetic) between species indicate surprisingly low conservation rates.
Understanding the conservation of biological interactions is crucial for deciphering conserved biological processes.

Purpose of the Study:

To investigate and explain the lower-than-expected conservation rates of protein interaction data across closely related species.
To test existing hypotheses and propose a novel network-based explanation for interaction conservation patterns.

Main Methods:

Collected comprehensive high-throughput interaction datasets for four model organisms: S. cerevisiae, S. pombe, C. elegans, and D. melanogaster.
Integrated all interaction evidence into a single network for each species.
Identified functional modules within these integrated networks and analyzed conservation rates of intra-module versus inter-module interactions.

Main Results:

Previously proposed hypotheses offered only limited explanations for the observed low conservation of interaction data.
Interactions within identified functional modules were conserved at significantly higher rates than previously reported.
Interactions connecting distinct functional modules showed lower conservation rates.

Conclusions:

Conservation of biological networks is primarily maintained at the functional module level between species.
Interactions within modules are substantially more conserved than interactions linking different modules.
This module-level conservation provides a network-based explanation for conserved biological processes despite variable protein interaction conservation.