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Updated: Apr 20, 2026

Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay PCA in Living Cells
Published on: March 3, 2015
Dissecting the human protein-protein interaction network via phylogenetic decomposition
Cho-Yi Chen1, Andy Ho2, Hsin-Yuan Huang3
1Genome and Systems Biology Degree Program, Department of Life Science, Institute of Molecular and Cellular Biology.
Ancient proteins form the core of the human protein-protein interaction (PPI) network, while younger proteins are peripheral. This age-based organization reflects evolutionary roles and subcellular localization in cells.
Area of Science:
- Proteomics
- Systems Biology
- Evolutionary Biology
Background:
- Protein-protein interaction (PPI) networks are crucial for understanding proteome organization.
- Analyzing complex PPI networks poses significant challenges.
Purpose of the Study:
- To develop a multi-dimensional model of the human PPI network.
- To link network topology with evolutionary and biological insights.
Main Methods:
- Phylogenetic grouping combined with force-directed graph simulation.
- Decomposition of the human PPI network.
Main Results:
- Ancient proteins are central, while young proteins are peripheral in the PPI network.
- Evidence of age homophily suggests selection pressures in PPI network evolution.
- Distinct age groups show specific biological processes, pathways, and subcellular localizations.
Conclusions:
- The human PPI network exhibits an age-structured organization with evolutionary and functional significance.
- Network structure mirrors subcellular localization, offering a model for cellular organization.
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