Related Experiment Videos
Accelerated evolution as a consequence of transitions to mutualism.
Summary
Fungal mutualism correlates with faster DNA evolution. This study shows that adopting a mutualistic lifestyle, like forming lichens, significantly increases the rate of DNA changes across the genome.
Area of Science:
- Molecular Evolution
- Mycology
- Symbiotic Relationships
Background:
- Rates of DNA evolution vary across species, but links to organism traits are unclear.
- Understanding evolutionary rate shifts is crucial for molecular phylogenetics.
Purpose of the Study:
- To investigate the relationship between fungal lifestyles and DNA evolution rates.
- To test hypotheses for shifts in DNA evolution rates using likelihood ratio testing.
Main Methods:
- Molecular phylogenetic analysis of mutualist and nonmutualist fungi.
- Likelihood ratio testing to evaluate evolutionary rate shifts.
- Examination of nuclear ribosomal DNA substitution rates.
Main Results:
- Four independent transitions to mutualism were identified in fungi.
- A significant association exists between mutualism and accelerated nucleotide substitution rates in nuclear ribosomal DNA.
- The transition to mutualism preceded the observed rate acceleration.
Conclusions:
- The adoption of a mutualistic lifestyle in fungi is linked to increased rates of DNA evolution.
- This accelerated rate of evolution appears to be a genome-wide phenomenon in mutualist fungi.