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Reversing opinions on Dollo's Law
Rachel Collin1, Maria Pia Miglietta
1Smithsonian Tropical Research Institute, Box 0843-03092, Balboa, Ancon, Republic of Panama. collinr@si.edu
Trends in Ecology & Evolution
|September 26, 2008
Summary
Dollo's Law, the irreversibility of complex evolutionary traits, is being challenged. New research suggests that lost features like digits and wings can reappear, questioning the strictness of this biological principle.
Area of Science:
- Evolutionary Biology
- Developmental Biology
- Genomics
Background:
- Dollo's Law posits that complex traits, once lost in evolution, cannot be reacquired.
- This concept has been a cornerstone in understanding evolutionary constraints.
Purpose of the Study:
- To review current research that challenges the traditional interpretation of Dollo's Law.
- To explore the mechanisms and evidence for the potential reversibility of complex traits.
Main Methods:
- Phylogenetic analyses to trace trait evolution.
- Genomic studies to investigate genetic underpinnings of trait loss and recovery.
- Evolutionary developmental biology (evo-devo) to examine developmental pathways.
Main Results:
- Phylogenetic studies show reacquisition of complex features like digits and wings.
- Genomic and evo-devo data reveal retention of underlying genetic and developmental architectures after trait loss.
- Evidence for Dollo's Law as a strict, universal law is diminishing.
Conclusions:
- The irreversibility of complex trait loss in evolution is not absolute.
- Evolutionary developmental pathways and genetic architectures may allow for the re-emergence of lost traits.
- Future research may shift focus to the broader concept of irreversibility in evolutionary changes.
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