Ontology highlight
ABSTRACT:
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| ERR532365_1.fastq.gz | Fastqsanger.gz | |||
| ERR532365_2.fastq.gz | Fastqsanger.gz | |||
| ERR532366_1.fastq.gz | Fastqsanger.gz | |||
| ERR532366_2.fastq.gz | Fastqsanger.gz | |||
| ERR532367_1.fastq.gz | Fastqsanger.gz |
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Project description:A thermal stress experiment on Heron Island (Great Barrier Reef) which involved a slow ramp in temperature over one week and then sampling after 4 days at 32 degrees was completed. Control samples were maintained at 27C. The idea of the experiment was to study bleaching from a single cell perspective and thus look at cell condition (both animal and host) in symbio (inside the host tissue) and compare it with the physiological/macromolecular composition of the expelled symbionts (dinoflagellates). Are the cells expelled from the coral host during thermal stress are a result of host stress or algae stress. We took samples for proteomics from the extracted endoderm cells (in symbio) and also of expelled cells. Samples were collected as the symbio left the host. These were flash frozen. Are the symbiont cells expelled from the coral host during thermal stress are a result of host stress or algae stress?
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Project description:The declining health of coral reefs worldwide is likely to intensify in response to continued anthropogenic disturbance from coastal development, pollution, and climate change. In response to these stresses, reef-building corals may exhibit bleaching, which marks the breakdown in symbiosis between coral and zooxanthellae. Mass coral bleaching due to elevated water temperature can devastate coral reefs on a large geographic scale. In order to understand the molecular and cellular basis of bleaching in corals, we have measured gene expression changes associated with thermal stress and bleaching using a cDNA microarray containing 1,310 genes of the Caribbean coral Montastraea faveolata. In a first experiment, we identified differentially expressed genes by comparing experimentally bleached M. faveolata fragments to control non-heat-stressed fragments. We also identified differentially expressed genes during a time course experiment with four time points across nine days. Results suggest that thermal stress and bleaching in M. faveolata affect the following processes: oxidative stress, Ca2+ homeostasis, cytoskeletal organization, cell death, calcification, metabolism, protein synthesis, heat shock protein activity, and transposon activity. These results represent the first large-scale transcriptomic study focused on revealing the cellular foundation of thermal stress-induced coral bleaching. We postulate that oxidative stress in thermal-stressed corals causes a disruption of Ca2+ homeostasis, which in turn leads to cytoskeletal and cell adhesion changes, decreased calcification, and the initiation of cell death via apoptosis and necrosis. Keywords: thermal stress response, time course, coral bleaching
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Project description:The declining health of coral reefs worldwide is likely to intensify in response to continued anthropogenic disturbance from coastal development, pollution, and climate change. In response to these stresses, reef-building corals may exhibit bleaching, which marks the breakdown in symbiosis between coral and zooxanthellae. Mass coral bleaching due to elevated water temperature can devastate coral reefs on a large geographic scale. In order to understand the molecular and cellular basis of bleaching in corals, we have measured gene expression changes associated with thermal stress and bleaching using a cDNA microarray containing 1,310 genes of the Caribbean coral Montastraea faveolata. In a first experiment, we identified differentially expressed genes by comparing experimentally bleached M. faveolata fragments to control non-heat-stressed fragments. We also identified differentially expressed genes during a time course experiment with four time points across nine days. Results suggest that thermal stress and bleaching in M. faveolata affect the following processes: oxidative stress, Ca2+ homeostasis, cytoskeletal organization, cell death, calcification, metabolism, protein synthesis, heat shock protein activity, and transposon activity. These results represent the first large-scale transcriptomic study focused on revealing the cellular foundation of thermal stress-induced coral bleaching. We postulate that oxidative stress in thermal-stressed corals causes a disruption of Ca2+ homeostasis, which in turn leads to cytoskeletal and cell adhesion changes, decreased calcification, and the initiation of cell death via apoptosis and necrosis. Keywords: thermal stress response; coral bleaching
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Project description:Marine gutless worms symbiont microbial communities from Heron Island, Australia - Candidatus Spirochaeta avisceralis HERON ISLAND 0001 metagenome
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