Overexpression of GmDof4 from Soybean Significantly Enhances the Lipid Content of Chlorella ellipsoidea
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ABSTRACT:
ORGANISM(S): Pseudochlorella pringsheimii
PROVIDER: GSE37473 | GEO | 2014/04/16
SECONDARY ACCESSION(S): PRJNA160175
REPOSITORIES: GEO
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Project description:Here, we transferred GmDof4 from soybean (Glycine max), a transcription factor affecting content of lipid in Arabidopsis, into C. ellipsoidea and found that the expression of GmDof4 significantly enhanced the lipid content by maximum 57.21%, shifted the content of different fatty acids, but did not affect the growth of the host cells. Using the Solexa/Illumina-based RNA-Seq analysis, we found expression of GmDof4 significantly regulates 1,076 genes, of which 754 genes were up-regulated and 322 genes were down-regulated, under mixotrophic culture. This study provides a new way to improve the lipid of microalgae. The GmDof4 transgenic strain Dof4-1 and control (pCK transgenic line CK-1) were cultured in liquid antibiotic-free Endo medium at 25M-bM-^DM-^C under illumination (100 M-NM-<mol photons m-2 s-1) for 120 h. Cells at a concentration of approximately 1M-CM-^W 10^7 cells/mL were collected for library construction and sequencing using Illumina GAIIx.
2014-04-16 | E-GEOD-37473 | biostudies-arrayexpress
Project description:We demonstrate that low-dose ionizing radiation from X-rays drives metabolic activation in microalgae. We exploited this phenomenon to develop a method for increased lipid yield in stationary phase Chlorella sorokiniana cultures by 25% in just 24 hours, caused by a reproducible metabolic response that includes up-regulation of >30 lipid metabolism genes. This approach avoids the need to modify the strain or cultivation conditions, and does not affect cell viability or biomass.
2024-06-06 | E-MTAB-12288 | biostudies-arrayexpress
Project description:Diatoms are prominent marine microalgae, interesting not only from an ecological point of view, but also for their possible use for biotechnology applications. They can be cultivated in phototrophic conditions, using sunlight as the only energy source. Some diatoms, however, can also grow in mixotrophic mode, where both light and external reduced carbon contribute to biomass accumulation. In this study, we investigated the consequences of mixotrophy on the growth and metabolism of the pennate diatom Phaeodactylum tricornutum, using glycerol as a source of reduced carbon. Transcriptomic, metabolomic and physiological data indicate that glycerol affects the central-carbon, carbon-storage and lipid metabolism of the diatom. In particular, glycerol addition mimics some typical responses of nitrogen limitation on lipid metabolism at the level of TAG accumulation and fatty acid composition. However, this compound does not diminish photosynthetic activity and cell growth, at variance with nutrient limitation, revealing essential aspects of the metabolic flexibility of these microalgae and suggesting possible biotechnological applications of mixotrophy.
2017-03-31 | GSE91004 | GEO
Project description:To investigate the mechanism by which the microalgae-yeast co-culture system promotes wastewater denitrification. We concluded that microalgae and yeast exhibit a mutually beneficial relationship in the co-culture system. Microalgae nitrogen metabolism can be influenced by both miRNA and mRNA, and the presence of yeast stimulates gene expression in microalgae.
2023-07-12 | GSE231399 | GEO
Project description:Soyfoods have been drawn the interrest in the roles that reducing risk of cardiovascular disease. Among various components, isoflavones have been come to the attention as beneficial soy ingredients. To evaluate the effectiveness of isoflavone content in dietary soybean (Glycine max) on modulating lipid metabolism, hepatic gene expressions involved in lipid metabolism were analyzed in rats. An isoflavone-rich cultivar (Yukipirika) and a conventional cultivar (Fukuyutaka) were employed. A principal component analysis (PCA) of microarray data was used to summarize characteristics of the experimental groups. As a result, the characteristics of the diets were largely explained by the first principal component (PC1). Soybean content in the diets distinctly separated in PC1. In contrast, isoflavone content had little effect on the mRNA expression. The GeneChip data was normalized and summarized by using SuperNORM data service (Skylight Biotech Inc.). Significance of expressional change among groups was tested by 2-way ANOVA on the normalized CEL data, which was deposited in a tab-separated ASCII text format. Principal components were identified on the summarized gene data.
2016-08-01 | GSE67782 | GEO
Project description:BackgroundThe lipid content of microalgae is regarded as an important indicator for biodiesel. Many attempts have been made to increase the lipid content of microalgae through biochemical and genetic engineering. Significant lipid accumulation in microalgae has been achieved using biochemical engineering, such as nitrogen starvation, but the cell growth was severely limited. However, enrichment of lipid content in microalgae by genetic engineering is anticipated. In this study, GmDof4 from soybean (Glycine max), a transcription factor affecting the lipid content in Arabidopsis, was transferred into Chlorella ellipsoidea. We then investigated the molecular mechanism underlying the enhancement of the lipid content of transformed C. ellipsoidea.ResultsWe constructed a plant expression vector, pGmDof4, and transformed GmDof4 into C. ellipsoidea by electroporation. The resulting expression of GmDof4 significantly enhanced the lipid content by 46.4 to 52.9%, but did not affect the growth rate of the host cells under mixotrophic culture conditions. Transcriptome profiles indicated that 1,076 transcripts were differentially regulated: of these, 754 genes were significantly upregulated and 322 genes were significantly downregulated in the transgenic strains under mixotrophic culture conditions. There are 22 significantly regulated genes (|log2 ratio| >1) involved in lipid and fatty acid metabolism. Quantitative real-time PCR and an enzyme activity assay revealed that GmDof4 significantly up-regulated the gene expression and enzyme activity of acetyl-coenzyme A carboxylase, a key enzyme for fatty acid synthesis, in transgenic C. ellipsoidea cells.ConclusionsThe hetero-expression of a transcription factor GmDof4 gene from soybean can significantly increase the lipid content but not affect the growth rate of C. ellipsoidea under mixotrophic culture conditions. The increase in lipid content could be attributed to the large number of genes with regulated expression. In particular, the acetyl-coenzyme A carboxylase gene expression and enzyme activity were significantly upregulated in the transgenic cells. Our research provides a new way to increase the lipid content of microalgae by introducing a specific transcription factor to microalgae strains that can be used for the biofuel and food industries.
| S-EPMC4159510 | biostudies-literature
Project description:Phytoplankton lipids, such as microalgae lipids, are important compounds of increasing interest in bioenergy, food, pharmacy, aquaculture and ecology for their high molecular diversity. There is a taxonomically diverse lipid response under P stress with unresolved questions related to the diversified mechanism behind the lipid responses. A marine microalgae with high EPA content was isolated, named Nannochloropsis sp. PJ12. We reveal a mechanism of phosphorus-induced lipid class remodeling in Nannochloropsis sp. PJ12 based on highly corresponding transcriptome and lipidome data. Phosphorus- deprivation leads to the rapid reduction of phospholipids (PL) and synthesis of the betaine lipids (BL). Phosphorus-complement recovers the content of PL and BL to the original level. The changes are mediated mainly by a glycerophosphoryldiester phosphodiesterases on the transcriptome level. To adapt to low phospholipids, the transcription levels of gene encoding P transporter were upregulated. When Nannochloropsis sp. PJ12 was once again under phosphorus-complement, some of gene encoding P transporter continue to increase on the transcription levels. The novel phospholipid-remodeling scheme opens new avenues for metabolic engineering of lipid composition in algae.
2021-12-20 | GSE124501 | GEO
Project description:Microalgae are considered to be a highly promising source for the production of biodiesel. However, the regulatory mechanism governing lipid biosynthesis has not been fully elucidated to date, and the improvement of lipid accumulation in microalgae is essential for the effective production of biodiesel. In this study, LEAFY COTYLEDON1 (LEC1) from Arabidopsis thaliana, a transcription factor (TF) that affects lipid content, was transferred into Chlorella ellipsoidea. Compared with wild-type (WT) strains, the total fatty acid content and total lipid content of AtLEC1 transgenic strains were significantly increased by 24.20-32.65 and 22.14-29.91%, respectively, under mixotrophic culture conditions and increased by 24.4-28.87 and 21.69-30.45%, respectively, under autotrophic conditions, while the protein content of the transgenic strains was significantly decreased by 18.23-21.44 and 12.28-18.66%, respectively, under mixotrophic and autotrophic conditions. Fortunately, the lipid and protein content variation did not affect the growth rate and biomass of transgenic strains under the two culture conditions. According to the transcriptomic data, the expression of 924 genes was significantly changed in the transgenic strain (LEC1-1). Of the 924 genes, 360 were upregulated, and 564 were downregulated. Based on qRT-PCR results, the expression profiles of key genes in the lipid synthesis pathway, such as ACCase, GPDH, PDAT1, and DGAT1, were significantly changed. By comparing the differentially expressed genes (DEGs) regulated by AtLEC1 in C. ellipsoidea and Arabidopsis, we observed that approximately 59% (95/160) of the genes related to lipid metabolism were upregulated in AtLEC1 transgenic Chlorella. Our research provides a means of increasing lipid content by introducing exogenous TF and presents a possible mechanism of AtLEC1 regulation of lipid accumulation in C. ellipsoidea.
| S-EPMC7925920 | biostudies-literature
Project description:Soyfoods have been drawn the interrest in the roles that reducing risk of cardiovascular disease. Among various components, isoflavones have been come to the attention as beneficial soy ingredients. To evaluate the effectiveness of isoflavone content in dietary soybean (Glycine max) on modulating lipid metabolism, hepatic gene expressions involved in lipid metabolism were analyzed in rats. An isoflavone-rich cultivar (Yukipirika) and a conventional cultivar (Fukuyutaka) were employed. A principal component analysis (PCA) of microarray data was used to summarize characteristics of the experimental groups. As a result, the characteristics of the diets were largely explained by the first principal component (PC1). Soybean content in the diets distinctly separated in PC1. In contrast, isoflavone content had little effect on the mRNA expression. The GeneChip data was normalized and summarized by using SuperNORM data service (Skylight Biotech Inc.). Significance of expressional change among groups was tested by 2-way ANOVA on the normalized CEL data, which was deposited in a tab-separated ASCII text format. Principal components were identified on the summarized gene data. Male Splague-Dawley rats were randomly divided into 4 groups and fed an experimental diet for 21 days. The experimental diets were as follows: a diet containing 200 g/kg casein (Cas, n=7); a diet containing two proteins derived equally from casein and Fukuyutaka (conventional cultiver soybean) (F10, n=7); a diet containing two proteins derived from casein and Yukipirika (high-isoflavone soybean) in the proportion of three parts to one (Y05, n=7); a diet containing two proteins derived equally from casein and Yukipirika (Y10, n=8). In each of the groups, five rats with average food intake were used for microarray analysis.
2016-08-01 | E-GEOD-67782 | biostudies-arrayexpress