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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Expression data from Aspergillus oryzae grown under hypoxic condition.

ABSTRACT: Hypoxia imposes stress on filamentous fungi that require oxygen to proliferate. Global transcription analysis of Aspergillus oryzae grown under hypoxic conditions found that the expression of about 50% of 4,244 affected genes was either induced or repressed more than 2-fold. A comparison of these genes with the hypoxically-regulated genes of A. nidulans (Masuo et al., Mol. Gen. Genet. 2010, 284:415-424) based on their predicted amino acid sequences classified them as bi-directional best hit (BBH), one-way best hit (extra homolog: EH) and no-hit (non-syntenic genes: NSG) genes. Clustering analysis of the BBH genes indicated that A. oryzae and A. nidulans down-regulated global translation and transcription under hypoxic conditions, respectively. Under hypoxic conditions, both fungi up-regulated genes for alcohol fermentation and the γ-aminobutyrate shunt of the tricarboxylate cycle, whereas A. oryzae up-regulated the glyoxylate pathway, indicating that both fungi eliminate NADH accumulation under hypoxic conditions. The A. oryzae NS genes included specific genes for secondary and nitric oxide metabolism under hypoxic conditions. This comparative transcriptomic analysis discovered common and strain-specific responses to hypoxia in hypoxic Aspergillus species. We transferred A. oryzae cells from normoxic to hypoxic conditions for 6 h, and then back to normoxic conditions to examine the effect of hypoxia on gene expression. Total RNA was prepared for DNA microarray analysis from the cells after 1, 3, and 6 h of exposure to hypoxia, followed by 1, 3, and 6 h of reoxygenation.

ORGANISM(S): Aspergillus oryzae RIB40

SUBMITTER: Yasunobu Terabayashi

PROVIDER: E-GEOD-31046 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Expression data from Aspergillus oryzae grown under hypoxic condition.

Project description:Hypoxia imposes stress on filamentous fungi that require oxygen to proliferate. Global transcription analysis of Aspergillus oryzae grown under hypoxic conditions found that the expression of about 50% of 4,244 affected genes was either induced or repressed more than 2-fold. A comparison of these genes with the hypoxically-regulated genes of A. nidulans (Masuo et al., Mol. Gen. Genet. 2010, 284:415-424) based on their predicted amino acid sequences classified them as bi-directional best hit (BBH), one-way best hit (extra homolog: EH) and no-hit (non-syntenic genes: NSG) genes. Clustering analysis of the BBH genes indicated that A. oryzae and A. nidulans down-regulated global translation and transcription under hypoxic conditions, respectively. Under hypoxic conditions, both fungi up-regulated genes for alcohol fermentation and the γ-aminobutyrate shunt of the tricarboxylate cycle, whereas A. oryzae up-regulated the glyoxylate pathway, indicating that both fungi eliminate NADH accumulation under hypoxic conditions. The A. oryzae NS genes included specific genes for secondary and nitric oxide metabolism under hypoxic conditions. This comparative transcriptomic analysis discovered common and strain-specific responses to hypoxia in hypoxic Aspergillus species.

2011-07-31 | GSE31046 | GEO

Expression data from Aspergillus nidulans grown under hypoxic condition.

Project description:Hypoxia imposes a challenge upon most of the filamentous fungi that require oxygen for proliferation. Here, we used whole genome DNA microarrays to investigate global transcriptional changes in Aspergillus nidulans gene expression after exposure to hypoxia followed by normoxia. Aeration affected the expression of 2,864 genes (27% of the total number of genes in the fungus), of which 50% were either induced or repressed under hypoxic conditions. Up-regulated genes included those for glycolysis, ethanol production, the tricarboxylic acid (TCA) cycle, and for the γ-aminobutyrate (GABA) shunt that bypasses two steps of the TCA cycle. Ethanol and lactate production under hypoxic conditions indicated that glucose was fermented to these compounds via the glycolytic pathway. Since the GABA shunt bypasses the NADH-generating reaction of the TCA cycle catalyzed by oxoglutarate dehydrogenase, hypoxic A. nidulans cells eliminated excess NADH. Hypoxia down-regulated some genes involved in transcription initiation by RNA polymerase II, and lowered the cellular mRNA content. These functions were resumed by reoxygenation, indicating that A. nidulans controls global transcription to adapt to a hypoxic environment. This study is the first to show that hypoxia elicits systematic transcriptional responses in A. nidulans. We transferred A. nidulans cells from normoxic to hypoxic conditions for 6 h, and then back to normoxic conditions to examine the effect of hypoxia on gene expression. Total RNA was prepared for DNA microarray analysis from the cells after 3 and 6 h of exposure to hypoxia, followed by 3 and 6 h of reoxygenation.

2010-08-14 | E-GEOD-23605 | biostudies-arrayexpress

Expression data from Aspergillus nidulans grown under hypoxic condition.

2010-08-14 | GSE23605 | GEO

Comparative transcriptomic and proteomic analyses provide insights into functional genes for hypoxic adaptation in embryos of Tibetan chickens

Project description:Tibetan chickens, a unique plateau breed, have good performances to adapt to high-altitude hypoxic environments. A number of positively selected genes have been reported in Tibetan chickens; however, the mechanisms of gene expression for hypoxia adaptation are not fully understood. In the present study, eggs from Tibetan (TC) and Chahua (CH) chickens were incubated under hypoxic and normoxic conditions, and vascularization in the chorioallantoic membrane (CAM) of embryos was observed. We found that the vessel density index (VDI) in CAM of TCs was lower than in CHs under hypoxia incubation.Proteomic analyses of CAM tissues were performed in TC and CH embryos under hypoxic incubation using iTRAQ. We obtained 387 differentially expressed proteins (DEPs) that were mainly enriched in angiogenesis, vasculature development, blood vessel morphogenesis, blood circulation, renin-angiotensin system, and HIF-1 and VEGF signaling pathways. Twenty-six genes involved in angiogenesis and blood circulation, two genes involved in ion transport, and six genes that regulated energy metabolism were identified as candidate functional genes in regulating hypoxic adaption of chicken embryos. Therefore, this research provided insights into the molecular mechanism of hypoxia adaptation in Tibetan chickens.

2021-09-08 | PXD012607 | Pride

Molecular changes induced by melanoma cell conditioned medium (MCM) in HUVEC cells.

Project description:Malignant melanoma is a complex genetic disease and the most aggressive form of skin cancer. Melanoma progression and metastatic dissemination fundamentally relies on the process of angiogenesis. Melanomas produce an array of angiogenic modulators that mediate pathological angiogenesis. Such tumor-associated modulators arbitrate the enhanced proliferative, survival and migratory responses exhibited by endothelial cells, in the hypoxic tumor environment. The current study focuses on melanoma-induced survival of endothelial cells under hypoxic conditions. Melanoma conditioned media were capable of enabling prolonged endothelial cell survival under hypoxia, in contrast with the conditioned media derived from melanocytes, breast and pancreatic tumors. To identify the global changes in gene expression and further characterize the pro-survival pathway induced in endothelial cells, we performed microarray analysis on endothelial cells treated with melanoma conditioned medium under normoxic and hypoxic conditions. Huvec cells were grown in melanoma conditioned medium or DMEM 10% FCS for 12 h under hypoxic or normoxic conditions. In order to identify the transcripts modulated by melanoma CM, samples treated with MCM were compared to those grown in DMEM alone.

2013-09-30 | E-GEOD-33115 | biostudies-arrayexpress

Carnosine Regulation of Intracellular pH Homeostasis Promotes Lysosome-dependent Tumor Immunoevasion

Project description:To explore which genes are suppressed by NFX1 under hypoxic conditions, we performed RNA-seq analysis in PLC cells overexpressing EV or NFX1 under hypoxia.

2023-11-16 | GSE198881 | GEO

Cellular response to hypoxia on human bronchial epithelial culture [scRNA-Seq CAP]

Project description:Purpose: To identify the cell types change and gene expression change under hypoxia on HBE cells. Methods: The primary human bronchial epithelial cells (HBE) were cultured on air-liquid interface (ALI) conditions. After 4 weeks, the cells were cultured under normoxic, symmetrical hypoxic (3.5% O2), or asymmetrical hypoxic (3.5% O2 basolateral with apical cap ~ 1% O2) conditions for 5 days. The cells were dissociated with Accutase solution and proceeded to scRNA-seq. Results: Asymmetrical hypoxic cells showed more hypoxia-related responses than symmetrical hypoxic cells.

2023-08-22 | GSE227586 | GEO

Effect of AtHRE1 and AtHRE2 overexpression in normoxia and hypoxia

Project description:HRE1 and HRE2 are two ERF transcription factors induced by low oxygen. In this work we analyzed the effect of ectopic expression of HRE1 and HRE2 on the arabidopsis transcriptome in aerobic and hypoxic (1% O2) conditions. While HRE1 has a moderate effect on the expression of anaerobic genes under hypoxia, HRE2 does not affect them either under aerobic or hypoxic conditions.

2009-10-31 | GSE17099 | GEO

CDK8 ChIP-seq from HCT116 cells in normoxia and hypoxia

Project description:To test if CDK8 acts directly at HIF1A target genes, we performed ChIP-seq experiments in HCT116 cells under normoxic and hypoxic conditions. ChIP-seq for CDK8 versus Input under normoxia and 24hrs hypoxia (1% O2).

2013-03-01 | E-GEOD-38258 | biostudies-arrayexpress

Cellular response to hypoxia on human bronchial epithelial culture [scRNA-Seq]

Project description:Purpose: To identify the cell types change and gene expression change under hypoxia on HBE cells. Methods: The primary human bronchial epithelial cells (HBE) were cultured on air-liquid interface (ALI) conditions. After 4 weeks, the cells were cultured under normoxic or hypoxic (1% O2) conditions for 6h or 5days. The cells were dissociated with Accutase solution and proceeded to scRNA-seq. Results: Hypoxia did not induce any hypoxia-specific cell types, however, all cell types upregulated hypoxia-related, and senescence-related genes and downregulated cell proliferation genes.

2023-08-22 | GSE227508 | GEO

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