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Acropora digitifera: deciphering the nature of the coral-Chromera association


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Acropora digitifera: deciphering the nature of the coral-Chromera association
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    Since the discovery of Chromera velia as a novel coral-associated microalga, this organism has attracted interest because of its unique evolutionary position between the photosynthetic dinoflagellates and the parasitic apicomplexans. The nature of the relationship between Chromera and its coral host is controversial. Is it a mutualism, from which both participants benefit, or is Chromera a parasite, harming its host? To better understand the interaction, larvae of the common Indo-Pacific reef-building coral Acropora digitifera were experimentally infected with Chromera and the impact on the host transcriptome assessed at 4, 12, and 48 h post-infection using Illumina RNA-Seq technology. The transcriptomic response of the coral to Chromera was complex and implies that host immunity is strongly suppressed, and both phagosome maturation and the apoptotic machinery modified. These responses differ markedly from those described for infection with a competent strain of the coral symbiont Symbiodinium, instead resembling those of vertebrate hosts to parasites and/or pathogens such as Mycobacterium tuberculosis. Consistent with ecological studies suggesting that the association may be accidental, the transcriptional response of A. digitifera larvae leads us to conclude that Chromera is more likely to be a coral parasite, commensal, or accidental bystander, but certainly not a beneficial mutualist.

    Overall design: The goal of the study is to determine the nature of the coral-Chromera association based on host transcriptional response post-Chromera infection.There were 2 conditions (Chromera-infected and control). Samples were taken at 3 time points post-Chromera infection; 4h, 12h and 48h. There were 3 biological replicates per condition. RNA was isolated and 17 RNA-Seq libraries were sequenced on Illumina Hi-Seq 2000 platform. Samples were analysed to infer differential gene expression, comparing the Chromera-infected samples to the control ones at each time point.

    The full methodology is available in the Open Access publication from the Related Publications link below.

Related Publications
  1. Mohamed, Amin R., Cumbo, Vivian R., Harii, Saki, Shinzato, Chuya, Chan, Cheong Xin, Ragan, Mark A., Satoh, Nori, Ball, Eldon E., and Miller, David J. (2018) Deciphering the nature of the coral-Chromera association. Isme Journal, 12 (3). pp. 776-790
    Open Access
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  1. Has part: >> SRA Experiments
    • ID: (EXTERNAL)
  2. Has part: >> BioSamples
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  3. Has association with: >> Geo Dataset
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  1. Managed by: Mr Amin Mohamed Esmail , , ARC Centre of Excellence for Coral Reef Studies, Comparative Genomics Centre
  2. Associated with: Dr Vivian Cumbo , , ARC Centre of Excellence for Coral Reef Studies, Marine Biology & Aquaculture
  3. Associated with: Prof David Miller , , ARC Centre of Excellence for Coral Reef Studies, Tropical Water & Ecosystems (TropWater), Comparative Genomics Centre
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Mr Amin Mohamed Esmail,
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  1. Saki Harii, University of the Ryukys, Okinawa, Japan
  2. Chuya Shinzato, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
  3. Cheong Xin Chan, University of Queensland
  4. Mark A. Ragan, University of Queensland
  5. Nori Satoh, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
  6. Eldon E. Ball, Australian National University
Fields of Research
  1. 060504 - Microbial Ecology (060504)
  2. 060411 - Population, Ecological and Evolutionary Genetics (060411)
Socio-Economic Objective
  1. 970106 - Expanding Knowledge in the Biological Sciences (970106)
  1. microbial ecology
  2. infection
  3. ARC Centre of Excellence for Coral Reef Studies
  4. molecular ecology
  5. transcriptomics
  6. Chromera
  7. Acropora digitifera
  8. microalga
  9. transcriptional response
  10. RNA sequences
  11. coral larvae
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Research Themes
Tropical Ecosystems, Conservation and Climate Change
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NCBI places no restrictions on the use or distribution of data
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Mohamed, A.; Cumbo, V.; Harii, S.; Shinzato, C.; Chan, C.; Ragan, M.; Satoh, N.; Ball, E.; Miller, D. (2018). Acropora digitifera: deciphering the nature of the coral-Chromera association. James Cook University. (dataset). 1b595d251e523b5260931fc09cd49db5