Synchrotron imaging and Markov Chain Monte Carlo reveal tooth mineralization patterns
Identifieur interne : 000320 ( Main/Exploration ); précédent : 000319; suivant : 000321Synchrotron imaging and Markov Chain Monte Carlo reveal tooth mineralization patterns
Auteurs : Daniel R. Green [États-Unis] ; Gregory M. Green [États-Unis] ; Albert S. Colman [États-Unis] ; Felicitas B. Bidlack [États-Unis] ; Paul Tafforeau [France] ; Tanya M. Smith [États-Unis, Australie]Source :
- PLoS ONE [ 1932-6203 ] ; 2017.
Abstract
The progressive character of tooth formation records aspects of mammalian life history, diet, seasonal behavior and climate. Tooth mineralization occurs in two stages: secretion and maturation, which overlap to some degree. Despite decades of study, the spatial and temporal pattern of elemental incorporation during enamel mineralization remains poorly characterized. Here we use synchrotron X-ray microtomography and Markov Chain Monte Carlo sampling to estimate mineralization patterns from an ontogenetic series of sheep molars (n = 45 M1s, 18 M2s). We adopt a Bayesian approach that posits a general pattern of maturation estimated from individual- and population-level mineral density variation over time. This approach converts static images of mineral density into a dynamic model of mineralization, and demonstrates that enamel secretion and maturation waves advance at nonlinear rates with distinct geometries. While enamel secretion is ordered, maturation geometry varies within a population and appears to be driven by diffusive processes. Our model yields concrete expectations for the integration of physiological and environmental signals, which is of particular significance for paleoseasonality research. This study also provides an avenue for characterizing mineralization patterns in other taxa. Our synchrotron imaging data and model are available for application to multiple disciplines, including health, material science, and paleontological research.
Url:
DOI: 10.1371/journal.pone.0186391
PubMed: 29049333
PubMed Central: 5648163
Affiliations:
- Australie, France, États-Unis
- Auvergne-Rhône-Alpes, Californie, Illinois, Massachusetts, Rhône-Alpes
- Cambridge (Massachusetts), Grenoble
- Université Harvard
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Le document en format XML
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<front><div type="abstract" xml:lang="en"><p>The progressive character of tooth formation records aspects of mammalian life history, diet, seasonal behavior and climate. Tooth mineralization occurs in two stages: secretion and maturation, which overlap to some degree. Despite decades of study, the spatial and temporal pattern of elemental incorporation during enamel mineralization remains poorly characterized. Here we use synchrotron X-ray microtomography and Markov Chain Monte Carlo sampling to estimate mineralization patterns from an ontogenetic series of sheep molars (n = 45 M1s, 18 M2s). We adopt a Bayesian approach that posits a general pattern of maturation estimated from individual- and population-level mineral density variation over time. This approach converts static images of mineral density into a dynamic model of mineralization, and demonstrates that enamel secretion and maturation waves advance at nonlinear rates with distinct geometries. While enamel secretion is ordered, maturation geometry varies within a population and appears to be driven by diffusive processes. Our model yields concrete expectations for the integration of physiological and environmental signals, which is of particular significance for paleoseasonality research. This study also provides an avenue for characterizing mineralization patterns in other taxa. Our synchrotron imaging data and model are available for application to multiple disciplines, including health, material science, and paleontological research.</p>
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</TEI>
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<li>France</li>
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