Article Dans Une Revue Science Advances Année : 2025

Dynamic change of calcium-rich compartments during coccolithophore biomineralization

Mariana Verezhak
Johannes Ihli
Manuel Guizar-Sicairos
Mirko Holler
Noriaki Ozaki
Rachel Wood
Tilman A Grünewald
Fabio Nudelman

Résumé

Coccolithophores are abundant marine phytoplankton that produce biomineralized calcite scales, called coccoliths, which sequester substantial amounts of carbon and play a substantial role in biogeochemical cycles. However, mechanisms underlying the storage and transport of ions essential for calcification remain unresolved. We used ptychographic x-ray computed tomography under cryogenic conditions to visualize intracellular calcium-rich structures involved in the storage of calcium ions in the coccolithophore species Chrysotila carterae . During calcification, we observed a range of structures, from small electron-dense bodies within larger compartments to denser and distributed globular compartments, before returning to small bodies once scale formation is complete. Nanobeam-scanning x-ray fluorescence measurements further revealed that these electron-dense bodies are rich in phosphorus and calcium (molar ratio of ~4:1). The dynamic nature of structures suggests that these bodies are part of the required cellular calcium ion transport pathways, a fundamental process critical for understanding the response of coccolithophores to climate change.

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hal-05217956 , version 1 (21-08-2025)

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Alexander Triccas, Daniel M Chevrier, Mariana Verezhak, Johannes Ihli, Manuel Guizar-Sicairos, et al.. Dynamic change of calcium-rich compartments during coccolithophore biomineralization. Science Advances , 2025, 11 (30), ⟨10.1126/sciadv.adv0618⟩. ⟨hal-05217956⟩
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