Biological rhythms in the deep-sea hydrothermal mussel Bathymodiolus azoricus

Audrey M. Mat (), Jozée Sarrazin, Gabriel V. Markov, Vincent Apremont, Christine Dubreuil, Camille Eché, Caroline Fabioux, Christophe Klopp, Pierre-Marie Sarradin, Arnaud Tanguy, Arnaud Huvet and Marjolaine Matabos ()
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Audrey M. Mat: Univ Brest, Ifremer, CNRS, IRD, LEMAR
Jozée Sarrazin: Ifremer, EEP
Gabriel V. Markov: Sorbonne Université, CNRS, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR)
Vincent Apremont: Univ Brest, Ifremer, CNRS, IRD, LEMAR
Christine Dubreuil: Univ Brest, Ifremer, CNRS, IRD, LEMAR
Camille Eché: GeT-PlaGe, Genotoul, INRA Auzeville
Caroline Fabioux: Univ Brest, Ifremer, CNRS, IRD, LEMAR
Christophe Klopp: INRA, Plate-forme Genotoul Bioinfo, UR875
Pierre-Marie Sarradin: Ifremer, EEP
Arnaud Tanguy: Sorbonne Université, CNRS, Lab. Adaptation et Diversité en Milieu Marin, Team ABICE, Station Biologique de Roscoff
Arnaud Huvet: Univ Brest, Ifremer, CNRS, IRD, LEMAR
Marjolaine Matabos: Ifremer, EEP

Nature Communications, 2020, vol. 11, issue 1, 1-12

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-17284-4

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