Abstract
Despite an increased understanding of functions in sponge microbiomes, the interactions among the symbionts and between symbionts and host are not well characterized. Here we reconstructed the metabolic interactions within the sponge Cymbastela concentrica microbiome in the context of functional features of symbiotic diatoms and the host. Three genome bins (CcPhy, CcNi and CcThau) were recovered from metagenomic data of C. concentrica, belonging to the proteobacterial family Phyllobacteriaceae, the Nitrospira genus and the thaumarchaeal order Nitrosopumilales. Gene expression was estimated by mapping C. concentrica metatranscriptomic reads. Our analyses indicated that CcPhy is heterotrophic, while CcNi and CcThau are chemolithoautotrophs. CcPhy expressed many transporters for the acquisition of dissolved organic compounds, likely available through the sponge’s filtration activity and symbiotic carbon fixation. Coupled nitrification by CcThau and CcNi was reconstructed, supported by the observed close proximity of the cells in fluorescence in situ hybridization. CcPhy facultative anaerobic respiration and assimilation by diatoms may consume the resulting nitrate. Transcriptional analysis of diatom and sponge functions indicated that these organisms are likely sources of organic compounds, for example, creatine/creatinine and dissolved organic carbon, for other members of the symbiosis. Our results suggest that organic nitrogen compounds, for example, creatine, creatinine, urea and cyanate, fuel the nitrogen cycle within the sponge. This study provides an unprecedented view of the metabolic interactions within sponge–microbe symbiosis, bridging the gap between cell- and community-level knowledge.
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Acknowledgements
We acknowledge the financial support of the Betty and Gordon Moore Foundation and the Australian Research Council. We thank Dr Tamsin Peters and Jadranka Nappi for sample collection. We also thank Dr Ute Hentschel for hosting GB at the GEOMAR Helmholtz Centre for Ocean Research. MTJ was supported by grants of the German Excellence Initiative to the Graduate School of Life Sciences, University of Wuerzburg.
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Moitinho-Silva, L., Díez-Vives, C., Batani, G. et al. Integrated metabolism in sponge–microbe symbiosis revealed by genome-centered metatranscriptomics. ISME J 11, 1651–1666 (2017). https://doi.org/10.1038/ismej.2017.25
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