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Biological rhythms in the deep-sea hydrothermal mussel Bathymodiolus azoricus

Abstract : Biological rhythms are a fundamental property of life. The deep ocean covers 66% of our planet surface and is one of the largest biomes. The deep sea has long been considered as an arrhythmic environment because sunlight is totally absent below 1,000 m depth. In the present study, we have sequenced the temporal transcriptomes of a deep-sea species, the ecosystem-structuring vent mussel Bathymodiolus azoricus. We reveal that tidal cycles predominate in the transcriptome and physiology of mussels fixed directly at hydrothermal vents at 1,688 m depth at the Mid-Atlantic Ridge, whereas daily cycles prevail in mussels sampled after laboratory acclimation. We identify B. azoricus canonical circadian clock genes, and show that oscillations observed in deep-sea mussels could be either a direct response to environmental stimulus, or be driven endogenously by one or more biological clocks. This work generates in situ insights into temporal organisation in a deep-sea organism.
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https://hal.archives-ouvertes.fr/hal-02907599
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Submitted on : Thursday, January 21, 2021 - 10:44:48 AM
Last modification on : Tuesday, November 16, 2021 - 4:10:40 AM
Long-term archiving on: : Thursday, April 22, 2021 - 6:39:42 PM

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Audrey Mat, Jozée Sarrazin, Gabriel Markov, Vincent Apremont, Christine Dubreuil, et al.. Biological rhythms in the deep-sea hydrothermal mussel Bathymodiolus azoricus. Nature Communications, Nature Publishing Group, 2020, 11 (1), ⟨10.1038/s41467-020-17284-4⟩. ⟨hal-02907599⟩

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