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Symbiodiniaceae associated with corals in a mangrove lagoon in Bourake, New Caledonia

ABSTRACT: Symbiodiniaceae associated with corals in a mangrove lagoon in Bourake, New Caledonia

PROVIDER: PRJNA510616 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8433230_1.fastq.gz	Fastqsanger.gz
	SRR8433230_2.fastq.gz	Fastqsanger.gz
	SRR8433240_1.fastq.gz	Fastqsanger.gz
	SRR8433240_2.fastq.gz	Fastqsanger.gz
	SRR8433231_1.fastq.gz	Fastqsanger.gz

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Bacteria associated with corals in a mangrove lagoon in Bourake, New Caledonia

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Project description:We examined gene expression profiling of native mussels that were sampled in early summer 2003 from sites of the Venice lagoon area known to be differently affected by chemical pollution: Sites 1 and 2 close to the industrial district of Marghera and Site 3 close to the Lido lagoon outlet. Site 4, a current mussel farm located offshore, has been chosen as source of reference targets for microarray hybridizations. We have limited the preliminary assessment to the digestive gland. Digestive gland total RNA of each Site was hybridized in competition with the offshore mussels (Site 4 - Reference) and the relative abundance of each gene was measured by directly comparing fluorescent signals for each probe. We carried out two separate hybridizations for each site of the Venice lagoon area.. Keywords = digestive gland Keywords = Venice lagoon Keywords = chemical pollution Keywords = native mussels Keywords = transcriptional profiling Keywords: ordered

2006-10-10 | GSE2184 | GEO

GNPS Broward County SCTLD Diseased, Recovered, Healthy Corals, Cultured Symbiodiniaceae

Project description:Syringe samples of field corals within Broward County were collected. Included are apparently healthy, apparently recovered, and corals visually identified as infected with Stony Coral Tissue Loss Disease. The extracts of these samples were analyzed with LC-MS/MS to identify compounds detected within the aforementioned samples. Included are extracts of cultured Symbiodiniaceae including Breviolum sp., Durusdinium sp., and Symbiodinium sp.

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Heterotrophy can save corals from oxidative stress and bleaching

Project description:Scleractinian corals acquire autotrophic nutrients via the photosynthetic activity of their symbionts and the subsequent transfer of photosynthates. Zooplankton predation by the animal (heterotrophy) is an additional food source. Under stress events, corals loose their symbionts, a phenomena known as bleaching, which eventually leads to starvation, unless corals increase their heterotrophic capacities. Molecular mechanisms by which heterotrophy sustains metabolism in stressed corals remain elusive. Here for the first time, we identify specific genes expressed in heterotrophically fed and unfed corals maintained under normal and light-stress conditions inducing bleaching. Physiological parameters and gene expression profiling showed ominously that fed corals better resisted the stress than unfed corals, by presenting less oxidative damage and protein/DNA degradation. Light stressed and unfed/starved corals (HLS) up-regulated by 140 and 13 times two genes (CP2U1 and CP1A2), which belong to the Cytochrome P450 superfamily, while these genes remained almost unchanged in fed corals (HLF). Other genes of redox regulation, DNA damage response, molecular chaperones, and protein degradation were also up-regulated in HLS corals, presenting higher bleaching, and strong decrease of the photosynthesis performance compared to HLF corals. Several pivotal genes associated with the calcification apparatus such as carbonic anhydrases, calcium-transporting ATPase, calcium channel subunit, and bone morphogenetic proteins (BMPs), were significantly down-regulated only in HLS corals. A parallel decrease in the calcification rates of these later corals was also observed. All together, these results show clearly that heterotrophy helps preventing oxidative stress in corals, and thus avoid the cascade of metabolic problems downstream this stress.

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