Histological description of tooth formation in adult Eretmodus cf. cyanostictus (Teleostei, Cichlidae)

Vandervennet, Els; Huysseune, Ann

doi:10.1016/j.archoralbio.2004.12.001

Cited by 12 publications

(12 citation statements)

References 21 publications

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“…e.g. on cleared and stained jaws, attached but weakly stained teeth, known to be more heavily mineralized and to represent more mature teeth, alternate along the tooth row with teeth that are more heavily stained, representing less mineralized and less mature teeth (note that hypermineralization, as in enameloid, prevents alizarin red S staining altogether, Vandervennet and Huysseune, ). Furthermore, teeth at the same position on both jaw halves seem to correspond in stage of maturation.…”

Section: Resultsmentioning

confidence: 99%

A comparison of the larval and juvenile dentition in Polypterus senegalus

2014

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Summary Polypterus senegalus is a freshwater fish belonging to the earliest diverged group of the actinopterygian lineage with currently living representatives. Its dentition has been well characterized in terms of distribution and shape of teeth in different life stages. Additionally, structural features of the first‐generation teeth have been briefly described. However, at present it is not known how the primary dentition is patterned and if this pattern is similar to that found in juveniles. In this preliminary study, to answer this question we investigate the tooth pattern of a larval P. senegalus based on serial sections and 3D reconstructions, and compare dental features in larvae and juveniles. Polypterus senegalus passive apterolarvae possess a well developed primary dentition. Dentigerous bones develop either prior to the teeth (dentary, retroarticular), or as an attachment site concomitant with the expanding dentition (coronoid 1). Most teeth are attached and erupted, and thus considered functional, and their pulp houses a blood vessel, two features that contrast with earlier findings. The primary teeth do not display a level of maturation that could reflect a particular order of development. New teeth are added anteriorly, and likely also posteriorly, to allow the tooth row to grow to keep pace with the growing jaw. Replacement teeth are absent at this stage. Thus, the pattern observed in juveniles, with alternate (odd and even) positions displaying a different level of tooth maturation, is not present in the larva. Most strikingly, in the larva, considerable symmetry exists between apparently random patterns on both dentaries, eliciting intriguing questions on left‐right control to be addressed in future studies.

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Section: Resultsmentioning

confidence: 99%

A comparison of the larval and juvenile dentition in Polypterus senegalus

2014

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“…A great deal is known about the development of cichlid teeth (Huysseune, '90;Huysseune and Sire, '92a,b;Streelman et al, 2003a;Vandervennet and Huysseune, 2005). Like many teleost fishes, adult cichlids have (1) multiple rows of teeth on two sets of jaws (oral and pharyngeal); (2) similarly shaped teeth within a row (homodonty), and (3) tooth replacement throughout life via de novo formation of tooth germs (polyphyodonty, Huysseune and Thesleff, 2004).…”

Section: Integrating Tooth Number and Tooth Shapementioning

confidence: 99%

Evolution of novelty in the cichlid dentition

Streelman

Albertson²

2006

J Exp Zool Pt B

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The shape of teeth occupies a central position in various biological disciplines, from paleo-ecology to molecular biology to cosmetic and reconstructive dentistry. Despite a long tradition of study in mammals, important questions remain regarding the genetic and developmental basis of differences in tooth shape. Here, we use natural mutants of cichlid fish from East Africa, which exhibit tremendous dental diversity, to help fill the gaps in our understanding of vertebrate odontogenesis. We employ an expanded genetic linkage map to demonstrate that cusp number segregates as a gene of major effect, which explains approximately 40% of the phenotypic variance, on cichlid chromosome 5. Furthermore, we examine patterns of Bmp4 expression in early odontogenesis to address and refine predictions of models linking tooth shape and tooth number. Mutations in the Bmp4 cistron do not control tooth shape in this mapping cross. Our data suggest that the evolution of novelty in the cichlid dentition is galvanized by a small number of genetic changes, echoing similar conclusions from recent studies of other vertebrate adaptive morphologies.

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“…In the intraosseous or intramedullary replacement, considered to be the advanced mode, replacement teeth develop inside the medullary cavity of the dentigerous bone (Trapani 2001;Huysseune and Thesleff 2004). In intramedullary replacement, the replacement tooth develops at the tip of a (long) epithelial downgrowth that has first penetrated into the bone medullary cavity (e.g., Peyer 1968;Wakita et al 1977;Berkovitz and Shellis 1978;Huysseune and Verraes 1989;Vandervennet and Huysseune 2005). For the tooth to erupt, the bone needs to be resorbed whereas the tooth migrates through the bone and finally attaches upon its surface (Witten et al 1999).…”

Section: Introductionmentioning

confidence: 99%

An evolutionary view on tooth development and replacement in wild Atlantic salmon (Salmo salar L.)

Huysseune

Witten

2008

Evolution and Development

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To gain an insight into the evolution of tooth replacement mechanisms, we studied the development of first-generation and replacement teeth on the dentary of wild Atlantic salmon (Salmo salar L.), a protacanthopterygian teleost, using serially sectioned heads of early posthatching stages as well as adults. First-generation teeth develop within the oral epithelium. The anlage of the replacement tooth is first seen as a placode-like thickening of the outer dental epithelium of the predecessor, at its lingual and caudal side. Ongoing development of the replacement tooth germ is characterized by the elaboration of a population of epithelial cells, termed here the middle dental epithelium, apposed to the inner dental epithelium on the lingual side of the tooth germ. Before the formation of the new successor, a single-layered outer dental epithelium segregates from the middle dental epithelium. The dental organs of the predecessor and the successor remain broadly interconnected. The absence of a discrete successional dental lamina in salmon stands in sharp contrast to what is observed in other teleosts, even those that share with salmon the extraosseous formation of replacement teeth. The mode of tooth replacement in Atlantic salmon displays several characters similar to those observed in the shark Squalus acanthias. To interpret similarities in tooth replacement between Atlantic salmon and chondrichthyans as a case of convergence, or to see them as a result of a heterochronic shift, requires knowledge on the replacement process in more basal actinopterygian lineages. The possibility that the middle dental epithelium functionally substitutes for a successional lamina, and could be a source of stem cells, whose descendants subsequently contribute to the placode of the new replacement tooth, needs to be explored.

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Histological description of tooth formation in adult Eretmodus cf. cyanostictus (Teleostei, Cichlidae)

Cited by 12 publications

References 21 publications

A comparison of the larval and juvenile dentition in Polypterus senegalus

A comparison of the larval and juvenile dentition in Polypterus senegalus

Evolution of novelty in the cichlid dentition

An evolutionary view on tooth development and replacement in wild Atlantic salmon (Salmo salar L.)

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