Comparative transcriptomic analyses of Chromera and Symbiodiniaceae

Mohamed, Amin R., Chan, Cheong Xin, Ragan, Mark A., Zhang, Jia, Cooke, Ira, Ball, Eldon E., and Miller, David J. (2020) Comparative transcriptomic analyses of Chromera and Symbiodiniaceae. Environmental Microbiology Reports, 12 (4). pp. 534-443.

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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.

Item ID: 63767
Item Type: Article (Research - C1)
ISSN: 1758-2229
Copyright Information: © 2020 Society for Applied Microbiology and John Wiley & Sons Ltd
Funders: Macquarie University (MQ), James Cook University (JCU), Egyptian Ministry of Higher Education and Scientific Research (EMHESR), Australian Research Council (ARC)
Projects and Grants: JCU Postgraduate Research Scholarship, ARC Grant Number: CE140100020
Date Deposited: 15 Jul 2020 07:35
FoR Codes: 31 BIOLOGICAL SCIENCES > 3105 Genetics > 310506 Gene mapping @ 100%
SEO Codes: 18 ENVIRONMENTAL MANAGEMENT > 1805 Marine systems and management > 180504 Marine biodiversity @ 100%
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