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Developmental biology. Lungfish dental pattern conserved for 360 Myr
1University of Toronto in Mississauga, 3359 Mississauga Road, Mississauga, Ontario L5L 1C6, Canada.
Nature
|June 1, 2001
Summary
Lungfish, close relatives of tetrapods, show a conserved tooth development pattern across 360 million years. This unique developmental programming applies to both palatal dental plates and transient marginal teeth in lungfish hatchlings.
Area of Science:
- Evolutionary biology
- Developmental biology
- Paleontology
Background:
- Lungfish are the closest living relatives of tetrapods (four-limbed animals).
- Adult lungfish lack marginal teeth, using palatal dental plates for feeding.
- Fossil and living lungfish species exhibit significant evolutionary divergence in adult dental morphology.
Purpose of the Study:
- To investigate the developmental patterns of dentition in lungfish.
- To compare tooth development across species separated by 360 million years.
- To determine if developmental programming is conserved despite adult morphological differences.
Main Methods:
- Comparative analysis of fossil and extant lungfish hatchlings.
- Examination of dental development in palatal and marginal tooth fields.
- Evolutionary developmental biology (evo-devo) approach to study conserved traits.
Main Results:
- An identical tooth development pattern was observed in hatchlings of fossil and living lungfish species.
- This conserved pattern shapes the palatal dental plates used for crushing food.
- The same developmental pattern is present in the transient marginal dentition of juveniles.
- This pattern is conserved across 360 million years of lungfish evolution.
Conclusions:
- Lungfish exhibit a unique, uniform, and conserved developmental programming for dentition.
- This conserved programming applies across all tooth fields (palatal and marginal).
- Developmental pathways are more stable than adult morphology over long evolutionary timescales.
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