Predicting evolutionary patterns of mammalian teeth from development - PubMed

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• PMID: 17898761
• DOI: 10.1038/nature06153

Predicting evolutionary patterns of mammalian teeth from development

Kathryn D Kavanagh et al. Nature. 2007.

Abstract

One motivation in the study of development is the discovery of mechanisms that may guide evolutionary change. Here we report how development governs relative size and number of cheek teeth, or molars, in the mouse. We constructed an inhibitory cascade model by experimentally uncovering the activator-inhibitor logic of sequential tooth development. The inhibitory cascade acts as a ratchet that determines molar size differences along the jaw, one effect being that the second molar always makes up one-third of total molar area. By using a macroevolutionary test, we demonstrate the success of the model in predicting dentition patterns found among murine rodent species with various diets, thereby providing an example of ecologically driven evolution along a developmentally favoured trajectory. In general, our work demonstrates how to construct and test developmental rules with evolutionary predictability in natural systems.

Comment in

• Evolutionary biology: development with a bite.

  Polly PD. Polly PD. Nature. 2007 Sep 27;449(7161):413-5. doi: 10.1038/449413a. Nature. 2007. PMID: 17898756 No abstract available.

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