Structure and composition of the boundary zone between aragonitic crossed lamellar and calcitic prism layers in the shell of <i><scp>C</scp>oncholepas concholepas</i> (<scp>M</scp>ollusca, <scp>G</scp>astropoda)

Dauphin, Yannicke; Cuif, Jean‐Pierre; Cotte, Marine; Salomé, Murielle

doi:10.1111/j.1744-7410.2012.00265.x

Cited by 9 publications

(5 citation statements)

References 21 publications

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“…1992 ). Similar to nacre, but less studied, it is composed of aragonite and a small fraction (<1% w/v) of organic matter ( Dauphin et al. 2012 ; Li et al.…”

Section: Discussionmentioning

confidence: 99%

Proteomic and Transcriptomic Analyses in the Slipper SnailCrepidulafornicataUncover Shell Matrix Genes Expressed During Adult and Larval Biomineralization

Batzel

Moreno

López

et al. 2022

Integrative Organismal Biology

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The gastropod shell is a composite composed of minerals and shell matrix proteins (SMPs). SMPs have been identified by proteomics in many molluscs, but few have been studied in detail. Open questions include 1) what gene regulatory networks regulate SMP expression, 2) what roles individual SMPs play in biomineralization, and 3) how the complement of SMPs changes over development. These questions are best addressed in a species in which gene perturbation studies are available; one such species is the slipper snail, Crepidula fornicata. Here, SEM and pXRD analysis demonstrated that the adult shell of C. fornicata exhibits crossed lamellar microstructure and is composed of aragonite. Using high-throughput proteomics we identified 185 SMPs occluded within the adult shell. Over half of the proteins in the shell proteome have known biomineralization domains, while at least 10% have no homologs in public databases. Differential gene expression analysis identified 20 SMP genes that are up-regulated in the shell-producing mantle tissue. Over half of these 20 SMPs are expressed during development with two, CfSMP1 and CfSMP2, expressed exclusively in the shell gland. Together, the description of the shell microstructure and a list of SMPs now sets the stage for studying the consequences of SMP gene knockdowns in molluscs.

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“…1992 ). Similar to nacre, but less studied, it is composed of aragonite and a small fraction (<1% w/v) of organic matter ( Dauphin et al. 2012 ; Li et al.…”

Section: Discussionmentioning

confidence: 99%

Proteomic and Transcriptomic Analyses in the Slipper SnailCrepidulafornicataUncover Shell Matrix Genes Expressed During Adult and Larval Biomineralization

Batzel

Moreno

López

et al. 2022

Integrative Organismal Biology

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“…Electron microprobe analyses have previously shown that the shells of some Haliotis species comprise aragonite and calcite that are irregularly dispersed and mixed (Dauphin et al, 2007). In regularly layered mollusk shells, a detailed examination of the boundary between the main layers shows transitional stages in both composition and structure (Dauphin et al, 2008, 2012; Farre et al, 2011; Nouet et al, 2012). In such shells, the main layers are easy to separate for various analyses, whereas the structure and composition of the transition layer is only known using in situ analyses.…”

Section: Discussionmentioning

confidence: 99%

Unusual Micrometric Calcite–Aragonite Interface in the Abalone Shell Haliotis (Mollusca, Gastropoda)

et al. 2013

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Species of Haliotis~abalone! show high variety in structure and mineralogy of the shell. One of the European species~Haliotis tuberculata! in particular has an unusual shell structure in which calcite and aragonite coexist at a microscale with small patches of aragonite embedded in larger calcitic zones. A detailed examination of the boundary between calcite and aragonite using analytical microscopies shows that the organic contents of calcite and aragonite differ. Moreover, changes in the chemical composition of the two minerals seem to be gradual and define a micrometric zone of transition between the two main layers. A similar transition zone has been observed between the layers in more classical and regularly structured mollusk shells. The imbrication of microscopic patches of aragonite within a calcitic zone suggests the occurrence of very fast physiological changes in these taxa.

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“…A similar transitional spherulitic layer is also visible between the outer calcitic prismatic and inner aragonitic CL microstructures of the gastropods Concholepas and Nucella (Dauphin et al . 2012; Mayk 2020).…”

Section: Discussionmentioning

confidence: 99%

Deep origin of the crossed‐lamellar microstructure in early Cambrian molluscs

Skovsted

Topper

2022

Palaeontology

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Aragonitic crossed‐lamellar (CL) is one of the most commonly formed and extensively studied molluscan shell microstructures, yet its origin and early evolution within the Mollusca remains poorly understood. Here, a primitive CL microstructure from one of the oldest gastropods, Pelagiella madianensis, and the problematic hyolith Cupitheca sp. of the Cambrian Series 2 Xinji Formation on the North China Platform, was investigated. In P. madianensis, detailed characterization has revealed a typical four‐ordered hierarchical organization of aragonitic crystallites, and a thick layer of organic membranes surrounding its first‐order lamellae. A transitional fibrous microstructure was observed between the outer CL and inner foliated aragonite structural layers. In Cupitheca sp., only the first and second‐order lamellae were visible due to preservation limitations, and the first‐order lamellae were extremely irregular in shape and size, which is consistent with modern representatives. This study demonstrates that the capability to construct highly‐mineralized intricate shells was acquired in early Cambrian stem‐group gastropods. The CL microstructure first emerged in the early Cambrian and as a basal synapomorphic trait in total‐group molluscs. Moreover, presence of the CL microstructure in problematic lophotrochozoans (i.e. hyoliths) is confirmed. This study contributes to a more complete picture of the evolutionary origin and architectural diversity of biomineralized mollusc shells during the Cambrian explosion, and strengthens the phylogenetic links between hyoliths and molluscs.

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Structure and composition of the boundary zone between aragonitic crossed lamellar and calcitic prism layers in the shell of Concholepas concholepas (Mollusca, Gastropoda)

Cited by 9 publications

References 21 publications

Proteomic and Transcriptomic Analyses in the Slipper SnailCrepidulafornicataUncover Shell Matrix Genes Expressed During Adult and Larval Biomineralization

Proteomic and Transcriptomic Analyses in the Slipper SnailCrepidulafornicataUncover Shell Matrix Genes Expressed During Adult and Larval Biomineralization

Unusual Micrometric Calcite–Aragonite Interface in the Abalone Shell Haliotis (Mollusca, Gastropoda)

Deep origin of the crossed‐lamellar microstructure in early Cambrian molluscs

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