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Evolutionary rewiring of bacterial regulatory networks
Tiffany B Taylor1, Geraldine Mulley1, Liam J McGuffin1
1School of Biological Sciences, University of Reading, Whiteknights, Reading RG6 6AJ, UK.
Microbial Cell (Graz, Austria)
|March 31, 2017
Summary
Gene networks in bacteria evolve through cross-talk, where mutations allow pathway interactions. While this enhances evolutionary resilience, it incurs significant pleiotropic costs, posing new research questions.
Area of Science:
- Microbial genetics and evolutionary biology
- Bacterial gene regulatory networks
Background:
- Bacteria utilize complex regulatory networks to integrate signals and adapt to environmental changes.
- Gene homology, arising from duplication and horizontal gene transfer, suggests potential for cross-talk and redundancy in these networks.
- This homology may confer evolutionary resilience by enabling functional rescue of lost regulatory elements.
Purpose of the Study:
- To investigate the role of mutations facilitating cross-talk between gene pathways in bacterial gene network evolution.
- To understand the evolutionary costs associated with such cross-talk mutations.
Main Methods:
- Analysis of gene duplication, divergence, and horizontal gene transfer events.
- Study of regulatory network components and their homology.
- Investigation of mutations impacting pathway cross-talk and their consequences.
Main Results:
- Mutations enabling cross-talk between gene pathways can drive gene network evolution.
- These beneficial mutations are associated with severe pleiotropic costs.
- The findings raise new questions about the mechanisms and implications of this evolutionary phenomenon.
Conclusions:
- Cross-talk between bacterial gene pathways is a significant factor in gene network evolution.
- The evolutionary advantage of cross-talk is counterbalanced by substantial pleiotropic costs.
- Further research is needed to elucidate the precise mechanisms and broader consequences of this evolutionary strategy.