Comparative transcriptomic analyses of Chromera and Symbiodiniaceae

Amin R. Mohamed, Cheong Xin Chan, Mark A. Ragan, Jia Zhang, Ira Cooke, Eldon E. Ball, David J. Miller*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    Reef-building corals live in a mutualistic relationship with photosynthetic algae (family Symbiodiniaceae) that usually provide most of the energy required by the coral host. This relationship is sensitive to temperature stress; as little as a 1°C increase often leads to the collapse of the association. This sensitivity has led to an interest in the potential of more stress-tolerant algae to supplement or substitute for the normal Symbiodiniaceae mutualists. In this respect, the apicomplexan-like microalga Chromera is of particular interest due to its greater temperature tolerance. We generated a de novo transcriptome for a Chromera strain isolated from a GBR coral (‘GBR Chromera’) and compared with those of the reference strain of Chromera (‘Sydney Chromera’), and to those of Symbiodiniaceae (Fugacium kawagutii, Cladocopium goreaui and Breviolum minutum), as well as the apicomplexan parasite, Plasmodium falciparum. In contrast to the high sequence divergence amongst representatives of different genera within the family Symbiodiniaceae, the two Chromera strains featured low sequence divergence at orthologous genes, implying that they are likely to be conspecifics. Although KEGG categories provide few criteria by which true coral mutualists might be identified, they do supply a molecular rationalization that explains the ecological dominance of Cladocopium spp. amongst Indo-Pacific reef corals. The presence of HSP20 genes may contribute to the high thermal tolerance of Chromera.

    Original languageEnglish
    Pages (from-to)435-443
    Number of pages9
    JournalEnvironmental Microbiology Reports
    Volume12
    Issue number4
    DOIs
    Publication statusPublished - 1 Aug 2020

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