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Emiliania huxleyi CCMP1516

ABSTRACT: Transcriptomic Analysis of Genes Associated with Cold-induced Storage Lipid Biosynthesis in Marine Haptophyte alga, Emiliania huxleyi

PROVIDER: PRJDB2127 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	DRR004457.fastq.gz	Fastqsanger.gz
	DRR004458.fastq.gz	Fastqsanger.gz
	DRR004459.fastq.gz	Fastqsanger.gz
	DRR004460.fastq.gz	Fastqsanger.gz
	DRR004461.fastq.gz	Fastqsanger.gz

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Transcriptional response of Emiliania huxleyi CCMP2090 exposed to the bacterial signaling molecule 2-heptyl-4-quinolone

Project description:In order to determine how the bacterial quorum-sensing precursor molecule 2-heptyl-4-quinolone (HHQ) induces cellular senescence in populations of some eukaryotic marine phytoplankton, we examined the transcriptional response of Emiliania huxleyi CCMP2090 to HHQ exposure. Quadruplicate batch cultures were treated with HHQ at three concentrations (1, 10 and 100 ng/ml) and compared to a vehicle control after 24 and 72 hours of exposure. The majority of gene expression changes occurred after 24 hr of exposure in the 10 and 100 ng/ml treatments and many of these changes persisted for 72 hr in the 100 ng/ml treatment. RNAseq analysis revealed that HHQ exposure impacts many aspects of Emiliania huxleyi metabolism including: chlorophyll biosynthesis and light harvesting, vitamin biosynthesis, vesicle trafficking, and general signals related to energy production. Changes in genes involved in intraphase cell cycle check points implicate DNA damage as the primary driver of HHQ-induced cellular senescence.

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Emiliania huxleyi

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LongSAGE transcriptome profiling in the widespread marine coccolithophore Emiliania huxleyi

Project description:The abundant and widespread coccolithophore Emiliania huxleyi plays an important role in mediating CO2 exchange between the ocean and the atmosphere through its impact on marine photosynthesis and calcification. Here, we use long serial analysis of gene expression (SAGE) to identify E. huxleyi genes responsive to nitrogen (N) or phosphorus (P) starvation. Long SAGE is an elegant approach for examining quantitative and comprehensive gene expression patterns without a priori knowledge of gene sequences via the detection of 21-bp nucleotide sequence tags. E. huxleyi appears to have a robust transcriptional-level response to macronutrient deficiency, with 42 tags uniquely present or up-regulated twofold or greater in the N-starved library and 128 tags uniquely present or up-regulated twofold or greater in the P-starved library. The expression patterns of several tags were validated with reverse transcriptase PCR. Roughly 48% of these differentially expressed tags could be mapped to publicly available genomic or expressed sequence tag (EST) sequence data. For example, in the P-starved library a number of the tags mapped to genes with a role in P scavenging, including a putative phosphate-repressible permease and a putative polyphosphate synthetase. In short, the long SAGE analyses have (i) identified many new differentially regulated gene sequences, (ii) assigned regulation data to EST sequences with no database homology and unknown function, and (iii) highlighted previously uncharacterized aspects of E. huxleyi N and P physiology. To this end, our long SAGE libraries provide a new public resource for gene discovery and transcriptional analysis in this biogeochemically important marine organism. Keywords: Emiliania, gene expression, nutrients, SAGE, phosphate, nitrogen

2007-07-07 | GSE8376 | GEO

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