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Evolutionary conservation and divergence of the transcriptional regulation of bivalve shell secretion across life-history stages.

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Cavallo, Alessandro  ORCID logo
Clark, Melody S 
Peck, Lloyd S 
Harper, Elizabeth M  ORCID logo
Sleight, Victoria A  ORCID logo


Adult molluscs produce shells with diverse morphologies and ornamentations, different colour patterns and microstructures. The larval shell, however, is a phenotypically more conserved structure. How do developmental and evolutionary processes generate varying diversity at different life-history stages within a species? Using live imaging, histology, scanning electron microscopy and transcriptomic profiling, we have described shell development in a heteroconchian bivalve, the Antarctic clam, Laternula elliptica, and compared it to adult shell secretion processes in the same species. Adult downstream shell genes, such as those encoding extracellular matrix proteins and biomineralization enzymes, were largely not expressed during shell development. Instead, a development-specific downstream gene repertoire was expressed. Upstream regulatory genes such as transcription factors and signalling molecules were largely conserved between developmental and adult shell secretion. Comparing heteroconchian data with recently reported pteriomorphian larval shell development data suggests that, despite being phenotypically more conserved, the downstream effectors constituting the larval shell 'tool-kit' may be as diverse as that of adults. Overall, our new data suggest that a larval shell formed using development-specific downstream effector genes is a conserved and ancestral feature of the bivalve lineage, and possibly more broadly across the molluscs.


Peer reviewed: True


biomineralization, evo devo, mollusc, shell development

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R Soc Open Sci

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The Royal Society
Wolfson College, University of Cambridge (Junior Research Fellowship)
Natural Environment Research Council (NE/J500173/1)
UKRI Natural Environment Research Council (NERC) (Core Funding to the British Antarctic Survey)