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

Cavallo, Alessandro ORCID: https://orcid.org/0000-0002-0135-0032; Clark, Melody S. ORCID: https://orcid.org/0000-0002-3442-3824; Peck, Lloyd S. ORCID: https://orcid.org/0000-0003-3479-6791; Harper, Elizabeth M.; Sleight, Victoria ORCID: https://orcid.org/0000-0003-0550-8500. 2022 Evolutionary conservation and divergence of the transcriptional regulation of bivalve shell secretion across life history stages. Royal Society Open Science, 9 (12), 221022. 11, pp. 10.1098/rsos.221022

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Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1098/rsos.221022
ISSN:	20545703
Additional Keywords:	shell development, evo devo, mollusc, biomineralization
Date made live:	22 Dec 2022 09:24 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/530613

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1098/rsos.221022

ISSN:

20545703

Additional Keywords:

shell development, evo devo, mollusc, biomineralization

Date made live:

22 Dec 2022 09:24 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/530613