Discordance of Species Trees with Their Most Likely Gene Trees
Author Information
Author(s): James H. Degnan, Noah A. Rosenberg
Primary Institution: Harvard School of Public Health and University of Michigan
Hypothesis
Can gene trees differ in topology from species trees due to the stochastic nature of lineage sorting during speciation?
Conclusion
The study reveals that using the most frequently observed gene tree topology to estimate species tree topology can lead to incorrect estimates.
Supporting Evidence
- Gene trees can have genealogical histories that differ from species trees.
- The most likely gene tree topology can differ from the species tree topology.
- Anomalous gene trees can lead to incorrect species tree estimates.
- Species trees with five or more taxa produce anomalies.
- Short branches in species trees increase the likelihood of anomalous gene trees.
Takeaway
Sometimes, the way genes evolve can make it look like different species are related in a way that isn't true, which can confuse scientists trying to figure out how species are connected.
Methodology
The study uses a coalescent model to analyze gene tree probabilities under various species tree topologies.
Potential Biases
The study assumes known gene trees, which may not reflect real-world scenarios where gene trees are estimated.
Limitations
The results are based on theoretical models and do not account for mutations that may affect gene tree inference.
Digital Object Identifier (DOI)
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