Specific organic matrix characteristics in skeletons of Corallium species

Debreuil, Julien; Tambutté, Sylvie; Zoccola, Didier; Segonds, N.; Techer, N.; Marschal, Christian; Allemand, Denis; Kosuge, Seiji; Tambutté, Éric

doi:10.1007/s00227-011-1775-7

Cited by 21 publications

(22 citation statements)

References 56 publications

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“…Thus, for Lacaze-Duthiers, sclerites play a role in the formation of the annular part (though not as important as in the central core). The presence of sclerites in the annular part has been challenged by Allemand and Bénazet-Tambutté (1996), Allemand and Grillo (1992), Debreuil et al (2012Debreuil et al ( , 2011aDebreuil et al ( , 2011b, and Grillo et al (1993) who concluded that the growth of annular part of the skeleton does not involve sclerites. This conclusion was reached in part on the basis of biocalcification kinetic experiments indicating that there was no delay in the calcification of sclerites and annular skeleton as would be expected if the skeleton was made by a process of sclerite aggregation (Allemand and Grillo 1992).…”

Section: Comparison To Previous Modelsmentioning

confidence: 95%

“…It should be stated that the two different growth modes are associated with contrasting rates observed in axial and radial growths (Debreuil et al 2011b;Marschal et al 2004). The diametral growth rate in the red coral has been estimated in the range 200 to 350 mm per year (Gallmetzer et al 2010;Garrabou and Harmelin 2002;Marschal et al 2004;Vielzeuf et al 2013) while the axial growth rate is about one order of magnitude higher and has been estimated around 1.8 ± 0.7 mm per year (Garrabou and Harmelin 2002).…”

Section: Anatomic Control Of the Change From A Growth Mode To Anothermentioning

confidence: 98%

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Block-by-block and layer-by-layer growth modes in coral skeletons

Perrin

Vielzeuf

Ricolleau

et al. 2015

American Mineralogist

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Understanding the dynamics of biomineral growth is a challenging goal of biomineralogy that can be achieved in part by deciphering biomineral structures and chemistries. The morphology, structure, and chemistry of six skeletons of Corallium and Paracorallium species (C. rubrum, C. elatius, C. johnsoni, C. niobe, P. japonicum, and P. thrinax) from the Mediterranean, the Atlantic, and the Pacific oceans have been studied by X-ray micro-computed tomography, polarized light microscope, scanning electron microscope, and electron microprobe. All species have two types of biomineral structures: an inner skeleton and sclerites that are small grains of Mg-calcite found in the living tissues surrounding the skeleton. All skeletons display a central core surrounded by an annular domain. In the species studied by electron microprobe (C. rubrum, C. elatius, and P. japonicum), the central core and the annular domains display different chemical compositions with the core richer in magnesium and poorer in sulfur than the annular domain. In terms of structure, special emphasis has been put on central cores for which little data are available. The central cores are made of sclerites and sclerite aggregates within a cement consisting of fine layers of Mg-calcite. On the other hand, the annular parts are made of fine concentric layers of calcite crystallites with only rare sclerites. These contrasting features imply two different growth modes: (1) a "block and cement" mode taking place at the apex of a branch and associated with a fast axial growth rate (~2 mm/yr); and (2) a layer-by-layer mode occurring below the apex and associated with a slow radial growth (~0.2 mm/yr). The change from a growth mode to another is anatomically controlled by the presence of a continuous network of gastrodermal canals around the sub-apical skeleton, preventing to a large extent the aggregation of sclerites. It is generally accepted that the Coralliidae family exhibits different types of skeletogeneses. In contrast with this idea, we observe that all studied Corallium species display remarkable similarities in terms of skeletogenesis and a unifying growth model for the Corallium genus is proposed. Similarities and differences with previous models are discussed. The present study shows that the morphological criterion initially used to establish the genus Paracorallium in the Coralliidae family is inadequate.

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Section: Comparison To Previous Modelsmentioning

confidence: 95%

Section: Anatomic Control Of the Change From A Growth Mode To Anothermentioning

confidence: 98%

Block-by-block and layer-by-layer growth modes in coral skeletons

Perrin

Vielzeuf

Ricolleau

et al. 2015

American Mineralogist

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“…Extraction of the organic fraction from the mineral fraction was adapted from Puverel et al (48) and Debreuil et al (47). Briefly, after demineralization of sclerites powder with 0.25 m EDTA (pH 7.8, 23 h, 4 °C; Sigma), the solution was prefiltered (0.2 μm of polyethersulfone) and centrifuged (10,000 × g , 15 min, 4 °C).…”

Section: Methodsmentioning

confidence: 99%

Molecular Cloning and Characterization of First Organic Matrix Protein from Sclerites of Red Coral, Corallium rubrum

Debreuil

Tambutté

Zoccola

et al. 2012

Journal of Biological Chemistry

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Background: Sclerites of alcyonarian species are biominerals formed of organic matrix molecules trapped inside a mineral inorganic fraction. Results: Scleritin is a small basic organic matrix protein, synthetized by scleroblasts and incorporated into sclerites. Conclusion: Scleritin is the first organic matrix protein fully characterized and localized in the sclerites of C. rubrum . Significance: Scleritin provides information on the biomineralization pathway in C. rubrum .

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“…Furthermore, other species of the genus Corallium from the Indo-Pacific were examined [45]. Even fossil precious corals (6-7.2 million years old) and samples from the Atlantic Ocean were studied.…”

Section: Methodsmentioning

confidence: 99%

“…A similar annular domain can be seen on the Magdalenenberg piece, but not as a color banding, rather as small gaps. These concentric corrugated features correspond to the growth rings of a stained cross-section of C. rubrum, as shown on Figure 3g [1, 3,4,13,17,45,47,53]. The examples from Ditzingen-Schöckingen (Figure 3a), Bussy-le-Château (Figure 3c) and especially from Somme-Tourbe (Figure 3f) illustrate a further interesting structural correlation: the more color that can be seen on an artifact, the more lustrous and smooth is the surface.…”

Section: Optical Differences Between the Surface Structures Of Ancienmentioning

confidence: 98%

Raman Investigations to Identify Corallium rubrum in Iron Age Jewelry and Ornaments

et al. 2016

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During the Central European Iron Age, more specifically between 600 and 100 BC, red precious corals (Corallium rubrum) became very popular in many regions, often associated with the so-called (early) Celts. Red corals are ideally suited to investigate several key questions of Iron Age research, like trade patterns or social and economic structures. While it is fairly easy to distinguish modern C. rubrum from bone, ivory or shells, archaeologists are confronted with ancient, hence altered, artifacts. Due to ageing processes, archaeological corals lose their intensive red color and shiny surface and can easily be confused with these other light colored materials. We propose a non-destructive multi-stage approach to identify archaeological corals amongst other biominerals used as ornament during the central European Iron Age with emphasis on optical examination and mobile Raman spectroscopy. Our investigations suggest that the noticeably high amount of misidentifications or at least uncertain material declarations existing in museums or even in the literature (around 15%) could be overcome by the proposed approach. Furthermore, the range of different materials is higher than previously expected in archaeological research. This finding has implications for contemporary concepts of social structures and distribution networks during the Iron Age.

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Specific organic matrix characteristics in skeletons of Corallium species

Cited by 21 publications

References 56 publications

Block-by-block and layer-by-layer growth modes in coral skeletons

Block-by-block and layer-by-layer growth modes in coral skeletons

Molecular Cloning and Characterization of First Organic Matrix Protein from Sclerites of Red Coral, Corallium rubrum

Raman Investigations to Identify Corallium rubrum in Iron Age Jewelry and Ornaments

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