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The role of reticulate evolution in creating innovation and complexity
Kristen S Swithers1, Shannon M Soucy, J Peter Gogarten
1Department of Molecular and Cell Biology, University of Connecticut, Storrs, CT 06269-3125, USA.
International Journal of Evolutionary Biology
|July 31, 2012
Summary
Reticulate evolution, including horizontal gene transfer (HGT) and gene duplications, drives biological innovation and complexity. These processes challenge traditional evolutionary models by introducing new traits and adaptations in organisms.
Area of Science:
- Evolutionary Biology
- Genomics
- Molecular Evolution
Background:
- Traditional evolutionary models often focus on vertical inheritance, represented by the Tree of Life.
- Reticulate evolution, involving processes like horizontal gene transfer (HGT) and gene duplication, presents alternative mechanisms for evolutionary change.
- These reticulate processes are significant drivers of innovation and complexity in both prokaryotic and eukaryotic organisms.
Purpose of the Study:
- To explore the roles of horizontal gene transfer (HGT) and gene/genome duplications in generating evolutionary innovation and complexity.
- To discuss how these mechanisms challenge and expand upon traditional Tree of Life concepts.
- To highlight the impact of HGT on metabolic pathways, ecological adaptation, and the evolution of new host ranges.
Main Methods:
- Review and synthesis of existing literature on reticulate evolution.
- Analysis of the impact of horizontal gene transfer (HGT) on prokaryotic and eukaryotic genomes.
- Examination of gene and genome duplications, particularly allopolyploidization, as a source of evolutionary novelty.
Main Results:
- Horizontal gene transfer (HGT) significantly impacts evolution by enabling new metabolic pathways, enhancing existing ones, and facilitating adaptation to new environments.
- HGT can be driven by selection for benefits, maintained by genetic drift, or lead to complexity through neutral evolution.
- Gene and genome duplications, especially via allopolyploidization, are crucial for generating innovation and complexity, particularly in eukaryotes.
Conclusions:
- Reticulate evolutionary processes, such as HGT and gene duplication, are fundamental to generating biological innovation and complexity.
- These mechanisms provide a more comprehensive understanding of evolution beyond the traditional Tree of Life model.
- Understanding reticulate evolution is key to comprehending the diversification and adaptation of life on Earth.
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