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Transcriptomic insights into the establishment of coral-algal symbioses from the symbiont perspective

View ORCID ProfileAmin R Mohamed, Natalia Andrade, Aurelie Moya, Cheong Xin Chan, Andrew P. Negri, David G. Bourne, Eldon E Ball, View ORCID ProfileDavid J Miller
doi: https://doi.org/10.1101/652131
Amin R Mohamed
1CSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia 4067, Queensland Australia
2Zoology Department, Faculty of Science, Benha University, Benha 13518, Egypt
3ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville 4811, Queensland, Australia
4Department of Molecular and Cell Biology, James Cook University, Townsville 4811, Queensland, Australia
5AIMS@JCU, Australian Institute of Marine Science, Department of Molecular and Cell Biology, James Cook University, Townsville 4811, Queensland, Australia
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  • For correspondence: david.miller@jcu.edu.au am_rd85@yahoo.com
Natalia Andrade
3ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville 4811, Queensland, Australia
4Department of Molecular and Cell Biology, James Cook University, Townsville 4811, Queensland, Australia
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Aurelie Moya
3ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville 4811, Queensland, Australia
4Department of Molecular and Cell Biology, James Cook University, Townsville 4811, Queensland, Australia
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Cheong Xin Chan
6Institute for Molecular Bioscience, The University of Queensland, Brisbane 4072 Queensland, Australia
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Andrew P. Negri
7Australian Institute of Marine Science, Townsville Queensland, Australia
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David G. Bourne
7Australian Institute of Marine Science, Townsville Queensland, Australia
8Department of Marine Ecosystems and Impacts, James Cook University Townsville 4811 Queensland, Australia
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Eldon E Ball
3ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville 4811, Queensland, Australia
9Division of Ecology and Evolution, Research School of Biology, Australian National University, Acton, ACT 2601, Australia
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David J Miller
3ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville 4811, Queensland, Australia
4Department of Molecular and Cell Biology, James Cook University, Townsville 4811, Queensland, Australia
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  • ORCID record for David J Miller
  • For correspondence: david.miller@jcu.edu.au am_rd85@yahoo.com
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Abstract

Despite the ecological significance of the mutualistic relationship between Symbiodiniaceae and reef-building corals, the molecular machinery underpinning the establishment of this relationship is not well understood. This is especially true of the symbiont side, as previous attempts to understand the interaction between coral larvae and Symbiodiniaceae have focused nearly exclusively on the host. In the current study, Acropora tenuis planula larvae were exposed to a compatible strain of Symbiodiniaceae (Cladocopium) and the transcriptomic landscape of the symbiont profiled at 3, 12, 48 and 72 h post-exposure using RNA-Seq. The transcriptomic response of Cladocopium to the symbiotic state was complex, the most obvious feature being an extensive and generalised downregulation of gene expression. Included in this “symbiosis-derived transcriptional repression” were a range of stress response and immune-related genes. In contrast, genes implicated in metabolism were upregulated in the symbiotic state. Consistent with previous ecological studies, this transcriptomic response of Cladocopium implied that active translocation of metabolites to the host occurred, and thus that the mutualistic relationship can be established at the larval stage. This study provides novel insights into the transcriptomic remodelling that occurs in Symbiodiniaceae, with important implications for understanding the establishment of symbiosis between corals and their dinoflagellate partners.

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  • Conflict of interest: The authors declare no conflict of interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-ND 4.0 International license.
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Posted May 31, 2019.
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Transcriptomic insights into the establishment of coral-algal symbioses from the symbiont perspective
Amin R Mohamed, Natalia Andrade, Aurelie Moya, Cheong Xin Chan, Andrew P. Negri, David G. Bourne, Eldon E Ball, David J Miller
bioRxiv 652131; doi: https://doi.org/10.1101/652131
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Transcriptomic insights into the establishment of coral-algal symbioses from the symbiont perspective
Amin R Mohamed, Natalia Andrade, Aurelie Moya, Cheong Xin Chan, Andrew P. Negri, David G. Bourne, Eldon E Ball, David J Miller
bioRxiv 652131; doi: https://doi.org/10.1101/652131

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