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Conversation Patterns between Children with Severe Speech Impairment and their Conversation Partners in Dyadic and Multi-person Interactions
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Cohort profile: indigenous human papillomavirus and oropharyngeal squamous cell carcinoma study - a prospective longitudinal cohort
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Population-based utility scores for HPV infection and oropharyngeal squamous cell carcinoma among Indigenous Australians
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Holocephalan (Chondrichthyes) dental plates with hypermineralized dentine as a substitute for missing teeth through developmental plasticity
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Abstract:
All extant holocephalans (Chimaeroidei) have lost the ability to make individual teeth, as tooth germs are neither part of the embryonic development of the dental plates, nor of their continuous growth. Instead, a hypermineralized dentine with a unique mineral, whitlockin, is specifically distributed within a dentine framework into structures that give the dental plates their distinctive, species-specific morphology. Control of the regulation of this distribution must be cellular, with a dental epithelium initiating the first outer dentine, and via contact with ectomesenchymal tissue as the only embryonic cell type that can make dentine. Chimaeroids have three pairs of dental plates within their mouth, two in the upper jaw and one in the lower. In the genera Chimaera, Hydrolagus and Harriotta, the morphology and distribution of this whitlockin within each dental plate differs both between different plates in the same species and between species. Whitlockin structures include ovoids, rods and tritoral pads, with substantial developmental changes between these. For example, rods appear before the ovoids, and result from a change in the surrounding trabecular dentine. In Harriotta, ovoids form separately from the tritoral pads, but also contribute to tritor development, while in Chimaera and Hydrolagus, tritoral This article is protected by copyright. All rights reserved. pads develop from rods that later are perforated to accommodate the vasculature. Nevertheless, the position of these structures, secreted by the specialized odontoblasts (whitloblasts), appears highly regulated in all three species. These distinct morphologies are established at the aboral margin of the dental plate, with proposed involvement of the outer dentine. We observe that this outer layer forms into serially added lingual ridges, occurring on the anterior plate only. We propose that positional, structural specificity must be contained within the ectomesenchymal populations, as stem cells below the dental epithelium, and a coincidental occurrence of each lingual, serial ridge with the whitlockin structures that contribute to the wear resistant oral surface.
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Keyword:
UCL/Birkbeck Centre for Planetary Sciences
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URL: https://eprints.bbk.ac.uk/id/eprint/31142/ https://doi.org/10.1111/jfb.14302 https://eprints.bbk.ac.uk/id/eprint/31142/1/Holocephalan%20tooth%20plates.pdf
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Evolution of the dentition in holocephalans (Chondrichthyes) through tissue disparity
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Eyewitness identification in child witnesses on the autism spectrum
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The first female gaze at postwar Japanese women : Tanaka Kinuyo film director
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Development and evolution of tooth renewal in neoselachian sharks as a model for transformation in chondrichthyan dentitions
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Development and evolution of tooth renewal in neoselachian sharks as a model for transformation in chondrichthyan dentitions
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Transition from an asylum seeker–specific health service to mainstream primary care for community-based asylum seekers: a qualitative interview study
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Verbal, visual, and intermediary support for child witnesses with autism during investigative interviews
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Improving the uptake of pre-travel health advice amongst migrant Australians: Exploring the attitudes of primary care providers and migrant community groups
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The effect of maltreatment type on adolescent executive functioning and inner speech
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Psychological trauma and help seeking behaviour amongst resettled Iraqi refugees in attending English tuition classes in Australia
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e-Symbiosis: technology-enabled support for industrial symbiosis targeting SMEs and innovation
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Psychological trauma and help seeking behaviour amongst resettled Iraqi refugees in attending English tuition classes in Australia
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