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The Great Barrier Reef and Red Sea Sequencing Project

ABSTRACT: Genomic sequencing of coral and associated microbial and viral communities and their algal symbionts from the The Great Barrier Reef and Red Sea.

PROVIDER: PRJEB5277 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	ERR571457_1.fastq.gz	Fastqsanger.gz
	ERR571457_2.fastq.gz	Fastqsanger.gz
	ERR571458_1.fastq.gz	Fastqsanger.gz
	ERR571458_2.fastq.gz	Fastqsanger.gz
	ERR571459_1.fastq.gz	Fastqsanger.gz

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Project description:Transcriptional responses to heat stress were assayed in early life-history stages of 11 crosses between and amongst Acropora tenuis colonies originating from reefs along the Great Barrier Reef. We identified a single nucleotide polymorphism outlier (Fst=0.89) between populations in the unannotated gene Acropora25324, which exhibited constitutively higher gene expression in populations with dams originating from Curd reef, a far north, warm adapted inshore reef, suggesting an important role of this gene in adaptation to warmer environments. Further, juveniles exposed to heat and in symbiosis with heat-evolved Symbiodiniaceae displayed intermediate transcriptional responses between its progenitor taxa (Cladocopium goreaui) and the more stress tolerant Durusdinium trenchii, indicating that the development of heat tolerance acquisition is potentially a conserved evolutionary process in Symbiodiniaceae. These findings reveal the underlying mechanisms, and for the first time, their relative contribution, of coral responses to climate change and provide a foundation for optimizing conservation methods like assistant gene flow.

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High natural gene expression variation in the reef-building coral Acropora millepora: Potential for acclimative and adaptive plasticity

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Dual-compartment shotgun proteomics unravel thermal stress responses in reef-calcifiers and their photosymbionts

Project description:The proliferation of coral reef organisms, such as the key ecological engineers and carbonate producers’ large benthic foraminifera (LBF), greatly relies on the mutual association with photosymbiotic algae. With respect to global change impacts such as ocean warming, evaluating stress and acclimatization responses is highly important, but probing proteins and partitioning host and symbionts are major obstacles for studying LBF. We therefore applied a label-free quantitative proteomics approach to LBF holobionts in order to detect changes in the relative abundances of proteins in response to different thermal-stress scenarios. Subsequent identification allowed for the partial assignment of 1,618 proteins to either foraminiferal host or endosymbiotic diatoms. While single and episodic thermal-stress events only induced minor metabolic impacts, chronic thermal stress diminished photosynthesis-related proteins among the symbionts. Stress response and proteolysis-related proteins increased in abundance, illustrating the extent of damage. In contrast to the symbionts, host homeostasis was maintained through extensive repair mechanisms and high protein turnover. Metabolic pathways were adjusted to the symbiont loss by using alternative energy resources. However, linking proteome to physiological data revealed that resource redistribution impairs growth and certainly other functions that could disturb carbonate production. We show how compartment partitioning can give insights into interactions and stress response mechanisms in photosymbiotic reef-calcifiers.

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High natural gene expression variation in the reef-building coral Acropora millepora: Potential for acclimative and adaptive plasticity

Project description:This experiment assessed the natural gene expression variation present between colonies of the Indo-Pacific reef-building coral Acropora millepora, and additionally explored whether gene expression differed between two different intron haplotypes according to intron 4-500 in a carbonic anhydrase homolog. This study found no correspondence between host genotype and transcriptional state, but found significant intercolony variation, detecting 488 representing unique genes or 17% of the total genes analyzed. Such transcriptomic variation could be the basis upon which natural selection can act. Underlying variation could potentially allow reef corals to respond to different environments. Whether this source of variation and the genetic responses of corals and its symbionts will allow coral reefs to cope to the rapid pace of global change remains unknown. A. millepora colonies were brought to a common garden in the reef lagoon, i.e. under the same environmental conditions. This common garden combined with acclimatization removes environmental effects on the physiology of the coral colonies. For the comparison of the two intron haplotypes, we applied a multiple dye-swap microarray design for the two groups of coral colonies (N=3 per group) defined based on the two genotypes resolved with the use of intron 4-500 (Fig. 1). To also examine the intra-haplotype variation we added a loop design nested to the above multiple dye-swap design, where three samples per colony were included. Colonies 1, 2, and 3 are of intron 4-500 haplotype 1; colonies 4, 5, and 6 are haplotype 2.

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