The branching patterns of reconstructed genealogical trees contain information about the relative fitness of sampled sequences in asexual populations. This structural information in the trees can be extracted and used to identify which sequences will be successful in future evolution. [@neher_predicting_2014]
Definitions
Synthesis
The concept that genealogical tree branching patterns reflect relative fitness differences is well-established as a foundational principle linking phylogenetic structure to evolutionary dynamics in asexual populations. The mechanistic relationship operates through differential reproductive success: variants with higher relative fitness produce more descendants, creating distinctive branching patterns where successful lineages generate more numerous and longer-lasting branches while less fit lineages terminate earlier. This connection enables predictive applications across asexual populations experiencing persistent selection pressure, with the approach demonstrating near-optimal performance in forecasting influenza progenitor lineages in most test cases. However, the approach’s reliance on the assumption that evolution proceeds primarily through accumulation of small-effect mutations rather than occasional large-effect changes represents a potential limitation whose validity may vary across different evolutionary contexts and timescales.
Related
- Small effect mutations accumulate during asexual population evolution
- Genealogical tree analysis predicts successful strains across asexual populations