Development and Structure of Some Actinopterygian and Urodele Teeth

Kerr, T. W.

doi:10.1111/j.1469-7998.1960.tb05570.x

Cited by 119 publications

(50 citation statements)

References 7 publications

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“…In amphibians, in addition to the enamel found in their adult teeth, the teeth of caudate larvae contain a thin layer of enamel that envelopes the cap enameloid (Bolte and Clemen 1992;Wistuba et al 2002;Davit-Beal et al 2007). Conversely, several groups (Kerr 1960;Smith Fig. 7 Representation of the tooth germs during the late stages of dentinogenesis in Polypterus (AM ameloblasts, CE collar enamel, D dentin, DP dental pulp, ED cap enameloid, EM film of enamel matrix, OD odontoblasts, PD predentin).…”

Section: Enamel Matrix Covers the Cap Enameloid As A Terminal Productmentioning

confidence: 99%

Fine structural and immunohistochemical detection of collar enamel in the teeth of Polypterus senegalus, an actinopterygian fish

et al. 2012

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This is the first detailed report about the collar enamel of the teeth of Polypterus senegalus. We have examined the fine structure of the collar enamel and enamel organ of Polypterus during amelogenesis by light and transmission electron microscopy. An immunohistochemical analysis with an antibody against bovine amelogenin, an antiserum against porcine amelogenin and region-specific antibodies or antiserum against the C-terminus, middle region and N-terminus of porcine amelogenin has also been performed to examine the collar enamel matrix present in these teeth. Their ameloblasts contain fully developed Golgi apparatus, rough endoplasmic reticulum and secretory granules. During collar enamel formation, an amorphous fine enamel matrix containing no collagen fibrils is found between the dentin and ameloblast layers. In non-demineralized sections, the collar enamel (500 nm to 1 μm thick) is distinguishable from dentin, because of its higher density and differences in the arrangement of its crystals. The fine structural features of collar enamel in Polypterus are similar to those of tooth enamel in Lepisosteus (gars), coelacanths, lungfish and amphibians. The enamel matrix shows intense immunoreactivity to the antibody and antiserum against mammalian amelogenins and to the middleregion- and C-terminal-specific anti-amelogenin antibodies. These findings suggest that the proteins in the enamel of Polypterus contain domains that closely resemble those of bovine and porcine amelogenins. The enamel matrix, which exhibits positive immunoreactivity to mammalian amelogenins, extends to the cap enameloid surface, implying that amelogenin-like proteins are secreted by ameloblasts as a thin matrix layer that covers the cap enameloid after enameloid maturation.

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Section: Enamel Matrix Covers the Cap Enameloid As A Terminal Productmentioning

confidence: 99%

Fine structural and immunohistochemical detection of collar enamel in the teeth of Polypterus senegalus, an actinopterygian fish

et al. 2012

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“…After the enameloid matrix begins mineralization, the IDE cells continue to secrete proteins into the enameloid for a short period of time, while odontoblasts deposit ECM proteins for dentin (Shellis and Miles, 1974). The odontoblast cell processes thus originally extend from the basal lamina, beneath the IDE cells, but these processes gradually disappear, and radiating fibers take their place as enameloid begins to calcify (Kerr, 1960;Sasagawa, 1995). Due to continuous extensions of cell processes and fibers, the junction between enameloid and dentin is often less distinct than that between enamel and dentin (Shellis and Miles, 1974).…”

mentioning

confidence: 97%

SCPP Gene Evolution and the Dental Mineralization Continuum

Kawasaki

Weiss

2008

J Dent Res

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Many genes critical to vertebrate skeletal mineralization are members of the secretory calcium-binding phosphoprotein (SCPP) gene family, which has evolved by gene duplication from a single ancestral gene. In humans, mutations in some of these SCPP genes have been associated with various diseases related to dentin or enamel hypoplasia. Recently, systematic searches for SCPP genes of various species have allowed us to investigate the history of phylogenetically variable dental tissues as a whole. One important conclusion is that not all disease-associated SCPP genes are present in tetrapods, and teleost fish probably have none, even in toothed species, having acquired their complement of SCPP genes through an independent duplication history. Here, we review comparative analyses of mineralized dental tissues, with particular emphasis on the use of SCPPs, within and between tetrapods and teleosts. Current knowledge suggests a close relationship among bone, dentin, teleost fish enameloid (enamel-like hard tissue), and tetrapod enamel. These tissues thus form a mineralized-tissue continuum. Contemporary dental tissues have evolved from an ancestral continuum through lineage-specific modifications.

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“…In basal polyphyodont vertebrates, like sharks, tooth replacement occurs in tooth families, where discrete tooth positions contain a developmentally staggered series of replacement teeth (Reif, 1984;Smith et al, 2009a). Although a few fish species, such as zebrafish, medaka and gobies, have been reported to have tooth families (Abduweli et al, 2014;Huysseune, 2006;Huysseune et al, 1998;Moriyama et al, 2010;Van der heyden and Huysseune, 2000), most teleosts lack obvious multigerm tooth families, instead appearing to replace teeth on an individual basis -as has been termed one-for-one replacement, such as in rainbow trout, Lake Malawi cichlids, Mexican tetra, among others (Atukorala and Franz-Odendaal, 2014;Bemis et al, 2005;Fraser et al, 2006Fraser et al, , 2013Kerr, 1960;Motta, 1984;Wakita et al, 1977). In both cases, replacement teeth can be present on the tooth plate before the previous tooth is shed and can contribute to the functional dentition.…”

Section: Unique Genetic Basis Of Evolved Tooth Gainmentioning

confidence: 99%

Distinct developmental and genetic mechanisms underlie convergently evolved tooth gain in sticklebacks

et al. 2015

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Teeth are a classic model system of organogenesis, as repeated and reciprocal epithelial and mesenchymal interactions pattern placode formation and outgrowth. Less is known about the developmental and genetic bases of tooth formation and replacement in polyphyodonts, which are vertebrates with continual tooth replacement. Here, we leverage natural variation in the threespine stickleback fish Gasterosteus aculeatus to investigate the genetic basis of tooth development and replacement. We find that two derived freshwater stickleback populations have both convergently evolved more ventral pharyngeal teeth through heritable genetic changes. In both populations, evolved tooth gain manifests late in development. Using pulse-chase vital dye labeling to mark newly forming teeth in adult fish, we find that both high-toothed freshwater populations have accelerated tooth replacement rates relative to lowtoothed ancestral marine fish. Despite the similar evolved phenotype of more teeth and an accelerated adult replacement rate, the timing of tooth number divergence and the spatial patterns of newly formed adult teeth are different in the two populations, suggesting distinct developmental mechanisms. Using genome-wide linkage mapping in marine-freshwater F2 genetic crosses, we find that the genetic basis of evolved tooth gain in the two freshwater populations is largely distinct. Together, our results support a model whereby increased tooth number and an accelerated tooth replacement rate have evolved convergently in two independently derived freshwater stickleback populations using largely distinct developmental and genetic mechanisms.

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Development and Structure of Some Actinopterygian and Urodele Teeth

Cited by 119 publications

References 7 publications

Fine structural and immunohistochemical detection of collar enamel in the teeth of Polypterus senegalus, an actinopterygian fish

Fine structural and immunohistochemical detection of collar enamel in the teeth of Polypterus senegalus, an actinopterygian fish

SCPP Gene Evolution and the Dental Mineralization Continuum

Distinct developmental and genetic mechanisms underlie convergently evolved tooth gain in sticklebacks

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