Teeth and ganoid scales in Polypterus and Lepisosteus, the basic actinopterygian fish: An approach to understand the origin of the tooth enamel

Sasagawa, Ichiro; Ishiyama, Mikio; Yokosuka, Hiroyuki; Mikami, Masato

doi:10.1016/j.job.2013.04.001

Cited by 24 publications

(14 citation statements)

References 49 publications

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“…Mineralization of enamel and enameloid progresses in organic matrices ( Berkovitz and Shellis, 2016 ) that are subsequently removed as they mature into hypermineralized inorganic tissues ( Sasagawa, 1997 ; Fincham et al., 1999 ). Enamel grows in a non-collagenous matrix secreted by ameloblasts of epithelial origin ( Fincham et al., 1999 ) and occurs in three main types: (1) true enamel, considered equivalent to mammalian tooth enamel ( Smith, 1989 ); (2) multilayered ganoin ( Schultze, 2016 ) on scales and their derivatives, found only in bichirs and gars among extant clades, as well as in diverse fossil actinopterygians ( Sire et al., 2009 ); and (3) tooth collar enamel, which occurs in actinopterygians, including bichirs, gars, and extinct clades ( Smith, 1995 ; Ishiyama et al., 1999 ; Sasagawa et al., 2013 ). Enameloid forms in a collagenous matrix secreted by both inner dental epithelial (IDE) cells and mesenchyme-derived odontoblasts ( Poole, 1967 ), often characterized histologically by protruding dentine tubules ( Smith, 1995 ).…”

Section: Resultsmentioning

confidence: 99%

“…Enameloid forms in a collagenous matrix secreted by both inner dental epithelial (IDE) cells and mesenchyme-derived odontoblasts ( Poole, 1967 ), often characterized histologically by protruding dentine tubules ( Smith, 1995 ). Enameloid constitutes an acrodin tooth cap in various extant and extinct actinopterygians ( Shellis and Miles, 1974 ; Sasagawa et al., 2013 ; Schultze, 2016 ). Tooth collar enameloid occurs in teleosts ( Shellis and Miles, 1974 ; Sasagawa, 1988 ; Smith, 1995 ).…”

Section: Resultsmentioning

confidence: 99%

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Coevolution of enamel, ganoin, enameloid, and their matrix SCPP genes in osteichthyans

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Coevolution of enamel, ganoin, enameloid, and their matrix SCPP genes in osteichthyans

et al. 2021

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“…Asterisks refer to characters that cannot be optimized to a particular node due to missing data from proximate taxa. Illustrations (C) and (E-J) are redrawn and modified from [13,24,30]. See also Dryad Figures S1-S5.…”

Section: Primitive Dermal Bone Histology In Osteichthyansmentioning

confidence: 99%

The Oldest Actinopterygian Highlights the Cryptic Early History of the Hyperdiverse Ray-Finned Fishes

et al. 2016

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Osteichthyans comprise two divisions, each containing over 32,000 living species [1]: Sarcopterygii (lobe-finned fishes and tetrapods) and Actinopterygii (ray-finned fishes). Recent discoveries from China highlight the morphological disparity of early sarcopterygians and extend their origin into the late Silurian [2-4]. By contrast, the oldest unambiguous actinopterygians are roughly 30 million years younger, leaving a long temporal gap populated by fragments and rare body fossils of controversial phylogenetic placement [5-10]. Here we reinvestigate the enigmatic osteichthyan Meemannia from the Early Devonian (∼415 million years ago) of China, previously identified as an exceptionally primitive lobe-finned fish [3, 7, 11, 12]. Meemannia combines "cosmine"-like tissues taken as evidence of sarcopterygian affinity with actinopterygian-like skull roof and braincase geometry, including endoskeletal enclosure of the spiracle and a lateral cranial canal. We report comparable histological structures in undoubted ray-finned fishes and conclude that they are general osteichthyan features. Phylogenetic analysis places Meemannia as an early-diverging ray-finned fish, resolving it as the sister lineage of Cheirolepis [13] plus all younger actinopterygians. This brings the first appearance of ray-fins more in line with that of lobe-fins and fills a conspicuous faunal gap in the otherwise diverse late Silurian-earliest Devonian vertebrate faunas of the South China Block [4].

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“…Importantly, spotted gar is well‐suited to represent an approximation to the ancestral, pre‐teleost and thus pre‐TGD, developmental morphology. Ancestral morphological features of gars include their hardy and protective ganoid scales, which share biochemical similarities with tetrapod tooth enamel (Sasagawa et al, ), a lung‐like gas bladder used for air breathing (Longo et al, ), and a dorso‐ventrally asymmetrical (heterocercal) tail rather than the pseudosymmetrical (homocercal), evolutionarily innovative tail of teleosts (Metscher and Ahlberg, ). Given its advantages, we proposed spotted gar as the best suited non‐teleost rayfin fish model species (Amores et al, ).…”

Section: Emerging Fish Systems For Evo‐devo‐geno Researchmentioning

confidence: 99%

A new model army: Emerging fish models to study the genomics of vertebrate Evo‐Devo

et al. 2014

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Many fields of biology – including vertebrate Evo-Devo research – are facing an explosion of genomic and transcriptomic sequence information and a multitude of fish species are now swimming in this ‘genomic tsunami’. Here, we first give an overview of recent developments in sequencing fish genomes and transcriptomes that identify properties of fish genomes requiring particular attention and propose strategies to overcome common challenges in fish genomics. We suggest that the generation of chromosome-level genome assemblies - for which we introduce the term ‘chromonome’ – should be a key component of genomic investigations in fish because they enable large-scale conserved synteny analyses that inform orthology detection, a process critical for connectivity of genomes. Orthology calls in vertebrates, especially in teleost fish, are complicated by divergent evolution of gene repertoires and functions following two rounds of genome duplication in the ancestor of vertebrates and a third round at the base of teleost fish. Second, using examples of spotted gar, basal teleosts, zebrafish-related cyprinids, cavefish, livebearers, icefish, and lobefin fish, we illustrate how next generation sequencing technologies liberate emerging fish systems from genomic ignorance and transform them into a new model army to answer longstanding questions on the genomic and developmental basis of their biodiversity. Finally, we discuss recent progress in the genetic toolbox for the major fish models for functional analysis, zebrafish and medaka, that can be transferred to many other fish species to study in vivo the functional effect of evolutionary genomic change as Evo-Devo research enters the postgenomic era.

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Teeth and ganoid scales in Polypterus and Lepisosteus, the basic actinopterygian fish: An approach to understand the origin of the tooth enamel

Cited by 24 publications

References 49 publications

Coevolution of enamel, ganoin, enameloid, and their matrix SCPP genes in osteichthyans

Coevolution of enamel, ganoin, enameloid, and their matrix SCPP genes in osteichthyans

The Oldest Actinopterygian Highlights the Cryptic Early History of the Hyperdiverse Ray-Finned Fishes

A new model army: Emerging fish models to study the genomics of vertebrate Evo‐Devo

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