Nannochloropsis oceanica
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ABSTRACT:
PROVIDER: PRJNA378404 | ENA |
REPOSITORIES: ENA
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Project description:In the present study the effect of phosphorus (P) limitation was investigated in the microalgae Nannochloropsis oceanica. Algal cultures were analysed for transcriptomic and lipidomic changes during P-limited growth, with sample time points: 24h, 48h, 53h, 58h and 70h. The transcriptome data identified unique P acquiring genes and the results were also supported by corresponding changes in the lipidome dataset, which showed a lipid class shift from phospholipids to phosphorus-free lipids under P-limitation. During the exponential growth phase a gradual 6-fold reduction of the cellular P level induced RNA transcripts encoding proteins acquiring P from inorganic and organic sources. For this process 6 novel purple acid phosphatases and 5 unique Pi transporters were identified. Additionally, increased gene expression of 2 triose-phosphate transporters (TPTs) indicated the importance of the carbon-to-phosphorus balance for the plastidial anabolic processes. Phospholipid degradation was shown to be an early response to P limitation, by overexpression of sets of 2 novel glycerophosphoryl diester phosphodiesterases (GDPDs), and 3 patatin-like phospholipases of type A. To compensate for phospholipid degradation, the transcriptome and lipidome level showed increased synthesis of sulfoquinovosyl diacylglycerol (SQDG), and diacylglyceroltrimethylhomoserine (DGTS). Phosphorus limitation triggered the lipid class shift in both the exponential growth phase and the triacylglycerol (TAG) accumulation period to release P and increase the organic C:P ratio.
2017-10-31 | GSE95774 | GEO
Project description:Nannochloropsis oceanica CCMP1779 is a marine unicellular stramenopile and an emerging reference species for basic research on oleogenic microalgae with biotechnological relevance. We investigated its physiology and transcriptome under light/dark cycles. We observed oscillations in lipid content and a predominance of cell division in the first half of the dark phase. Globally, more than 60% of the genes cycled in N. oceanica CCMP1779, with gene expression peaking at different times of the day. Interestingly, the phase of expression of genes involved in certain biological processes was conserved across photosynthetic lineages. Furthermore, in agreement with our physiological studies we found the processes of lipid metabolism and cell division enriched in cycling genes. For example, there was tight coordination of genes involved in the lower part of glycolysis, fatty acid synthesis and lipid production at dawn preceding lipid accumulation during the day. Our results suggest that diel lipid storage plays a key role for N. oceanica CCMP1779 growth under natural conditions making this alga a promising model to gain a basic mechanistic understanding of triacylglycerol production in photosynthetic cells. Our data will help the formulation of new hypotheses on the regulation transcriptional control of cell growth and metabolism in Nannochloropsis. Nannochloropsis oceanica CCMP was entrained to 12:12 light:dark cycles and biological replicates collected every 3 hours for a cycle for a total of 16 samples.
2015-08-01 | E-GEOD-69460 | biostudies-arrayexpress
Project description:Unicellular marine algae have promise for providing sustainable and scalable biofuel feedstocks, although no single species has emerged as a preferred organism. Moreover, adequate molecular and genetic resources prerequisite for the rational engineering of marine algal feedstocks are lacking for most candidate species. Heterokonts of the genus Nannochloropsis naturally have high cellular oil content and are already in use for industrial production of high value lipid products. First success in applying reverse genetics makes Nannochloropsis species attractive models to investigate the cell and molecular biology and biochemistry of this fascinating organism group. (Principle findings) Here we present the assembly of the 28.7 Mb genome of Nannochloropsis oceanica CCMP1779. RNA sequencing data from N-replete and N-depleted growth conditions support a total of 11,973 genes, which in addition to automatic annotation were manually inspected to predict the biochemical repertoire for this organism. Among others, more than 100 genes putatively related to lipid metabolism, 114 predicted transcription factors and 109 transcriptional regulators were annotated. In addition, we provide protocols for the transformation of the sequenced strain. (Significance) The availability of genomic and transcriptomic data for Nannochloropsis oceanica CCMP1779, along with efficient transformation protocols provides a blueprint for future detailed gene functional analysis and phylogenetic comparison of Nannochloropsis species by a growing academic community focused on this genus. one sample each of nitrogen-replete and nitrogen-depleted conditions
2012-04-04 | E-GEOD-36959 | biostudies-arrayexpress
Project description:Transcriptional regulation in response to nitrogen stress for one ant two days, and epigenome-association with phenotypic plasticity of lipid metabolism are uncovered in marine microalga Nannochloropsis oceanica IMET1.
2023-08-23 | GSE225079 | GEO
Project description:Limited systems-level understanding of oil synthesis in wild oleaginous algae has hindered the development of microalgal feedstock. Nannochloropsis is a small unicellular microalgae widely distributed in oceans and fresh water. In many large-scale and pilot-scale outdoor cultivation facilities, Nannochloropsis strains have been found to be capable of robust growth when supplied with flue gases, naturally accumulating large quantities of oils in a stationary phase, and exhibiting resistance to environmental contaminants. The rich genomic resources, compact genomes, resistance to foreign DNA invasion, wide ecological adaptation, large collections of natural strains and the demonstrated ability to grow on a large scale suggested Nannochloropsis can serve as research models and platform strains for economical and scalable photosynthetic production of fuels and chemicals. To untangle the intricate genome-wide networks underlying the robust biomass accumulation and oil production in Nannochloropsis, we applied high-throughput mRNA-sequencing and reconstructed the structure and dynamics of the genome-wide functional network underlying robust microalgal triacylglycerol (TAG) production in Nannochloropsis oceanica, by tracking the genome-wide, single-base-resolutiontranscript change for the complete time-courses of nitrogen-depletion-induced TAG synthesis. Nannochloropsis oceanica IMET1 cells were grown in liquid cultures under continuous light (approximately 50 M-BM-5mol photons m-2 s-1) at 25M-bM-^DM-^C and aerated by bubbling with a mixture of 1.5% CO2 in air. Mid-logarithmic phase algal cells were collected and washed three times with axenic seawater. Equal numbers of cells were re-inoculated in nitrogen replete medium (Control condition or C, i.e. N+) and nitrogen deprived medium (N deficiency or N, i.e. N-) with 50M-BM-5mol m-2 s-1 light intensity, respectively. Cell aliquots were collected for RNA isolation after being transferred to the designated conditions for 3h, 4h, 6h, 12h, 24h and 48h. Three biological replicates of algal cultures were established under each of the above M-bM-^@M-^\CM-bM-^@M-^] (i.e. N+) and M-bM-^@M-^\NM-bM-^@M-^] (i.e. N-) conditions, respectively. In total, 36 samples collected at six time points (3h,4h,6h,12h,24h and 48h) were used for mRNA-Seq library preparation and then submitted to Illumina HiSeq 2000 for sequencing.
2014-05-14 | E-GEOD-42508 | biostudies-arrayexpress
Project description:Nannochloropsis oceanica IMET1 Transcriptome
| PRJNA525331 | ENA
Project description:Reorganization of 3D chromatin structure in response to nitrogen stress for one ant two days, and epigenome-association with phenotypic plasticity of lipid metabolism are firstly uncovered in marine microalga Nannochloropsis oceanica IMET1.
2023-08-23 | GSE223130 | GEO
Project description:We report the transcriptomic dynamics and metabolic adaptation of Nannochloropsis oceanica to blue (410nm) and red (680nm) light by high-throghout Next-generation sequencing (NGS). Preferential excitation of different light spectra induces massive reprogramming of the Nannochloropsis transcriptome.
2022-10-28 | GSE139615 | GEO
Project description:Epigenetic regulation in response to CO2 fluctuation and epigenome-association with phenotypic plasticity of CCM are firstly uncovered in marine microalga Nannochloropsis oceanica IMET1. The result showed that Kbu and H3K9m2 histone modifications were present in N. oceanica IMET1. Moreover, both Kbu and H3K9m2 positively regulated gene expression.
2024-09-03 | GSE189253 | GEO