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3D microstructural study of selachimorph enameloid evolution
Journal of Structural Biology ( IF 3 ) Pub Date : 2020-11-19 , DOI: 10.1016/j.jsb.2020.107664
C Fellah 1 , T Douillard 2 , E Maire 2 , S Meille 2 , B Reynard 1 , G Cuny 3
Affiliation  

Enameloid, the hyper-mineralized tissue covering shark teeth is a complex structure resulting from both ameloblast and odontoblast activity. The way these two types of cells interact to set up this tissue is not fully understood and results in the formation of subunits in the enameloid: the Single Crystallite Enameloid (SCE) and the Bundled Crystallite Enameloid (BCE). Using the Focused Ion Beam Nanotomography (FIB-nt), 3D images were produced to assess the relationship between the SCE and BCE of one fossil and one recent neoselachian shark teeth. 3D analysis of crystallite bundles reveals a strong connection between the crystallites forming the SCE and those forming the bundles of the Radial Bundle Enameloid (RBE), a component of the BCE, although it has been suggested that SCE and BCE have a different origin: epithelial for the SCE and mesenchymal for the BCE. Another significant result of the use of FIB-nt is the visualization of frequent branching among the radial bundles forming the RBE, including horizontal link between adjacent bundles. FIB-nt demonstrates therefore a strong potential to decipher the complex evolution of hyper-mineralised tissue in shark teeth, and, therefore, to better understand the evolution of tooth structure among basal Gnathostomes.



中文翻译:

鲨形体釉质进化的 3D 显微结构研究

牙釉质是覆盖鲨鱼牙齿的超矿化组织,是一种由成釉细胞和成牙本质细胞活动产生的复杂结构。这两种类型的细胞相互作用以建立这种组织的方式尚不完全清楚,并导致在釉质中形成亚基:单晶釉质 (SCE) 和成束的微晶釉质 (BCE)。使用聚焦离子束纳米断层扫描 (FIB-nt),生成 3D 图像以评估一种化石和一种最近的新鲨鱼牙齿的 SCE 和 BCE 之间的关系。微晶束的 3D 分析揭示了形成 SCE 的微晶与形成径向束釉质 (RBE)(BCE 的一个组成部分)束的微晶之间存在很强的联系,尽管有人认为 SCE 和 BCE 具有不同的起源:SCE 为上皮细胞,BCE 为间充质细胞。使用 FIB-nt 的另一个重要结果是形成 RBE 的径向束之间频繁分支的可视化,包括相邻束之间的水平链接。因此,FIB-nt 显示出强大的潜力来破译鲨鱼牙齿中高矿化组织的复杂进化,因此,可以更好地了解基底 Gnathostomes 中牙齿结构的进化.

更新日期:2020-11-27
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