The oldest articulated chondrichthyan from the Early Devonian period

Miller, Randall F.; Cloutier, Richard; Turner, Susan

doi:10.1038/nature02001

Cited by 143 publications

(160 citation statements)

References 12 publications

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“…1 C-G and Movie S2). This conveyor-belt mechanism of successional regeneration appears to be a synapomorphy of oral teeth in crown gnathostomes (15,16). Although both the precocious embryonic caudal tail ( Fig.…”

Section: Successional Regeneration Is a Property Unique To Teeth Amongmentioning

confidence: 99%

Sox2+ progenitors in sharks link taste development with the evolution of regenerative teeth from denticles

Martin

Rasch

Cooper

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

146

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Teeth and denticles belong to a specialized class of mineralizing epithelial appendages called odontodes. Although homology of oral teeth in jawed vertebrates is well supported, the evolutionary origin of teeth and their relationship with other odontode types is less clear. We compared the cellular and molecular mechanisms directing development of teeth and skin denticles in sharks, where both odontode types are retained. We show that teeth and denticles are deeply homologous developmental modules with equivalent underlying odontode gene regulatory networks (GRNs). Notably, the expression of the epithelial progenitor and stem cell marker sex-determining region Y-related box 2 (sox2) was tooth-specific and this correlates with notable differences in odontode regenerative ability. Whereas shark teeth retain the ancestral gnathostome character of continuous successional regeneration, new denticles arise only asynchronously with growth or after wounding. Sox2+ putative stem cells associated with the shark dental lamina (DL) emerge from a field of epithelial progenitors shared with anteriormost taste buds, before establishing within slow-cycling cell niches at the (i) superficial taste/tooth junction (T/TJ), and (ii) deep successional lamina (SL) where tooth regeneration initiates. Furthermore, during regeneration, cells from the superficial T/TJ migrate into the SL and contribute to new teeth, demonstrating persistent contribution of taste-associated progenitors to tooth regeneration in vivo. This data suggests a trajectory for tooth evolution involving cooption of the odontode GRN from nonregenerating denticles by sox2+ progenitors native to the oral taste epithelium, facilitating the evolution of a novel regenerative module of odontodes in the mouth of early jawed vertebrates: the teeth.regeneration | stem cells | odontogenesis | chondrichthyes | evolutionary novelty

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Section: Successional Regeneration Is a Property Unique To Teeth Amongmentioning

confidence: 99%

Sox2+ progenitors in sharks link taste development with the evolution of regenerative teeth from denticles

Martin

Rasch

Cooper

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

146

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“…The Lower Devonian (late Emsian) Campbellton Formation is a sequence of terrestrial conglomerate, sandstone, and mudstone rich in plant and fish fossils. It unconformably overlies volcanic rocks of the Dalhousie Group along the Bay of Chaleur (Dineley and Williams 1968;Andrews et al 1974Andrews et al , 1975Gensel 1982;Trant and Gensel 1985;Richardson and McGregor 1986;Gensel et al 1991;Johnson and Gensel 1992;Miller 1996;Shear et al 1996;Miller et al 2003;Wilson et al 2005;Burrow et al 2008;Turner and Miller 2008;Gerrienne et al 2011).…”

Section: Northwest Of the Rocky Brook-millstream Faultmentioning

confidence: 99%

A Review of Proterozoic to Early Paleozoic Lithotectonic Terranes in New Brunswick, Canada and their Tectonic Evolution during Penobscot, Taconic, Salinic and Acadian Orogenesis

Fyffe

Johnson²,

Staal

2012

atgeol

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Geological relationships preserved in the New Brunswick segment of the Appalachian orogen are key to deciphering the complex tectonic events that occurred during the closing of the Paleozoic Iapetus Ocean. These events can be explained in terms of geodynamic interactions between eight lithotectonic terranes. The first, the Caledonia terrane, comprises Neoproterozoic volcanic arc sequences and comagmatic plutons considered to form part of the microcontinent of Avalonia. The seven other terranes are associated with the microcontinent of Ganderia and consist of (1) Brookville terrane-Mesoproterozoic to Neoproterozoic platformal carbonates and Neoproterozoic to Early Cambrian plutonic rocks, (2) New River terrane-Neoproterozoic volcanic arc sequences and comagmatic plutons overlain by a Cambrian Penobscot volcanic arc sequence, In New Brunswick, closure of the Iapetus Ocean is attributed to four major tectonic episodes: (1) the Penobscot orogeny, which accreted the Miramichi, Annidale, and St. Croix terranes to the New River terrane on the trailing edge of Ganderia by closing a Penobscot backarc basin in the Early Ordovician, (2) the Taconic orogeny, which accreted the Popelogan terrane on the leading edge of Ganderia to the Laurentian margin in the Late Ordovician and effectively closed the main tract of the Iapetus Ocean, (3) the Salinic orogeny, which accreted the Elmtree and Miramichi terranes to the Laurentian margin by closing the Tetagouche backarc basin in the Silurian, and (4) the Acadian orogeny, which accreted the Caledonia terrane (Avalonia) to the Brookville and New River terranes on the trailing edge of Ganderia in the latest Silurian to earliest Devonian and in the process closed the last remaining oceanic tract in the northeastern Appalachians. RÉSUMÉLes corrélations géologiques préservées dans la partie du Nouveau-Brunswick de l'orogène des Appalaches sont essentielles pour bien comprendre le déroulement des événements tectoniques complexes survenus au moment de la fermeture de l'océan Iapetus, pendant le Paléozoïque. Il est possible d'expliquer ces événements par des interactions géodynamiques entre huit terranes lithotectoniques. Le premier, soit le terrane calédonien, comprend des séquences d'arc volcanique et des plutons comagmatiques du Néoprotérozoïque dont on estime qu'ils faisaient partie du microcontinent Avalonia. Les sept autres terranes sont associés au microcontinent Ganderia et comprenaient les terranes que voici : (1)

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“…Prismatic cartilage is composed of apatite and covers parts of the cartilaginous skeleton of chondrichthyan fishes, providing extra strength (Dean and Summers, 2006). It is believed to be a chondrichthyan synapomorphy (Maisey, 1986), found in all extant forms and known from early fossil forms (Miller et al, 2003).…”

Section: Other Selachian Remainsmentioning

confidence: 99%

A marine vertebrate fauna from the Late Triassic of Somerset, and a review of British placodonts

Nordén

Duffin

Benton

2015

Proceedings of the Geologists' Association

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The oldest articulated chondrichthyan from the Early Devonian period

Cited by 143 publications

References 12 publications

Sox2+ progenitors in sharks link taste development with the evolution of regenerative teeth from denticles

Sox2+ progenitors in sharks link taste development with the evolution of regenerative teeth from denticles

A Review of Proterozoic to Early Paleozoic Lithotectonic Terranes in New Brunswick, Canada and their Tectonic Evolution during Penobscot, Taconic, Salinic and Acadian Orogenesis

A marine vertebrate fauna from the Late Triassic of Somerset, and a review of British placodonts

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