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Novel specificities emerge by stepwise duplication of functional modules
José B Pereira-Leal1, Sarah A Teichmann
1MRC-Laboratory of Molecular Biology, Structural Studies Division, Cambridge CB2 2QH, United Kingdom. jleal@mrc-lmb.cam.ac.uk
Genome Research
|April 5, 2005
Summary
Module duplication is a significant evolutionary mechanism in cellular networks. This study reveals that many protein complexes in Saccharomyces cerevisiae evolved through partial duplications, leading to functional specialization.
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Systems Biology
Background:
- Modularity is crucial for cellular systems, enabling discrete biological processes.
- Mechanisms driving the evolution of functional modules remain largely unexplored.
- Module duplication is a known innovation driver in artificial intelligence but unstudied in biology.
Purpose of the Study:
- To investigate whether module duplication occurs in biological cellular networks.
- To analyze the prevalence and patterns of module duplication in Saccharomyces cerevisiae protein complexes.
Main Methods:
- Developed a generic framework to analyze module duplication.
- Applied this framework to a large-scale dataset of Saccharomyces cerevisiae protein complexes.
- Assessed similarity between protein complexes to identify potential duplications.
Main Results:
- Identified that 6%-20% of protein complexes exhibit strong similarity to others, suggesting evolution by duplication.
- Observed that many complexes evolved through step-wise partial duplications.
- Found that duplicated complexes maintain overall function but diverge in binding specificities and regulation.
Conclusions:
- Module duplication is a considerable evolutionary pathway for functional modules in cellular networks.
- Duplication of protein complexes facilitates functional specialization through altered binding and regulation.
- This study provides evidence for module duplication as a key driver of biological innovation.