Genome-wide mapping of Hif-1α binding sites in zebrafish
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA289762 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR2096266.fastq.gz | Fastqsanger.gz | |||
| SRR2096267.fastq.gz | Fastqsanger.gz | |||
| SRR2096268.fastq.gz | Fastqsanger.gz | |||
| SRR2096269.fastq.gz | Fastqsanger.gz |
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Project description:Analysis of the binding sites of Hif-1α in both wild-type and von Hippel Lindau mutant zebrafish lines at 4dpf by ChIP linked next generation sequencing. The von Hippel Lindau mutant displays a systemic hypoxic response under normoxic conditions. Results show the extent of Hif-1α binding to the genome, and provide a basis for analysis of the transcriptional response to genetically induced hypoxia in zebrafish.
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Project description:Analysis of gene expression changes in the von Hippel Lindau when mutant compared to wild-type at 4dpf using a whole genome microarray expression profiling. The von Hippel Lindau mutant displays a systemic hypoxic response under normoxic conditions. We performed single-colour microarrays to identify the gene expression changes which underpin the hypoxic phenotype. We used 3 biological replicates from both mutant and control, followed by analysis using Limma to identify significant gene expression changes. This work, together with ChIP-seq data for the Hif-1α in von Hippel Lindau mutants, should allow for the Hif-1α dependency of these gene expression changes to be assessed.
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Project description:Analysis of the binding sites of Hif-1α in both wild-type and von Hippel Lindau mutant zebrafish lines at 4dpf by ChIP linked next generation sequencing. The von Hippel Lindau mutant displays a systemic hypoxic response under normoxic conditions. Results show the extent of Hif-1α binding to the genome, and provide a basis for analysis of the transcriptional response to genetically induced hypoxia in zebrafish. Analysis of the DNA binding sites of Hif-1α in both wild-type and von Hippel Lindau mutant zebrafish lines at 4dpf. The von Hippel Lindau mutant displays a systemic hypoxic response under normoxic conditions. Results show the extent of Hif-1α binding to the genome, and provide a basis for analysis of the dependency of the transcriptional response on Hif-1α in conditions of genetically induced hypoxia in zebrafish.
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Project description:To investigate the detailed molecular mechanisms for the regulatory role of HIF-1α in colon, microarray gene expression analysis was performed on colon RNA isolated from 6- to 8-week-old Hif-1α+/+, Hif-1αLSL/LSL mice. Background & Aims: The progression and growth of solid tumors leads to a state where tumors outgrow their capacity for efficient oxygenation and nutrient uptake and an increase in tumor hypoxia. Tumor hypoxic response is mediated by hypoxia-inducible factor (HIF)-1a and HIF-2a. These transcription factors regulate a battery of genes that are critical for tumor oxygenation, tumor metabolism, and cell proliferation and survival. Therefore, inhibitors of HIF have been sought for as anti-neoplastic agents in several different kinds of cancers. Interestingly, in ischemic and inflammatory diseases of the intestine, activation of HIF-1a is beneficial, and can reduce intestinal inflammation. The efficacy of pharmacological agents that chronically activate HIF-1a are decreased due to the tumorigenic potential of HIF. However, recent advance in understanding HIF signaling have identified mechanisms, which could allow for isoform specific activators. Activation of HIF-2a increases colon carcinogenesis and progression in mouse models. However, the role of chronic HIF-1a activation is unclear in the progression in colon cancer. The present data demonstrates that activation of HIF-1a in epithelial cells does not increase colon carcinogens or progression in two mouse models of colon cancer, and provides the proof of principle that HIF-1a activation maybe safe as therapies for inflammatory bowel disease. Global gene expression profiling in colon RNAs isolated from 6- to 8-week-old Hif-1α+/+ (n=5, Shah 019) and Hif-1αLSL/LSL (n=5, Shah 020).
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Project description:Hypoxia-inducible factor-1 (HIF-1) is a master regulator of glucose metabolism in cancer cells. Here, we demonstrate that a HIF-1α anti-sense lncRNA, HIFAL, is essential for maintaining and enhancing HIF-1α-mediated transactivation and glycolysis. Mechanistically, HIFAL recruits PHD3 to PKM2 to induce its prolyl hydroxylation and introduces the PKM2/PHD3 complex into the nucleus via binding with hnRNPF to enhance HIF-1α transactivation. Reciprocally, HIF-1α induces HIFAL transcription, which forms a positive feed-forward loop to maintain the transactivation activity of HIF-1α. Clinically, high HIFAL expression is associated with aggressive breast cancer phenotype and poor patient outcome. Furthermore, HIFAL overexpression promotes tumor growth in vivo, while targeting both HIFAL and HIF-1α significantly rescues their effect on cancer growth. Overall, our results indicate a critical regulatory role of HIFAL in HIF-1α-driven transactivation and glycolysis, identifying HIFAL as a therapeutic target for cancer treatment.
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Project description:Hypoxia inducible factor-1α (HIF-1α) is a critical transcription factor for the hypoxic response, angiogenesis, normal hematopoietic stem cell regulation, and cancer development. Importantly, HIF-1α is also a key regulator for immune cell activation. In order to determine whether HIF-1α is sufficient for developing MDS phenotypes, we generated blood specific inducible HIF-1α transgenic mice. Using Vav1-Cre/Rosa26-loxP-Stop-loxP (LSL) rtTA driver, stable HIF-1α can be induced in a doxycycline administration dependent manner. After induction, HIF-1α-induced mice developed thrombocytopenia, leukocytopenia, macrocytic anemia, and multi-lineage dysplasia. We also found activation of both innate and adaptive immunity in HIF-1α- induced mice compared to those from control mice. Taken together, these data suggest that HIF-1α is sufficient to trigger a variety of key MDS features
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Project description:Increased levels of hypoxia and hypoxia inducible factor 1α (HIF-1α) in human sarcomas correlate with tumor progression and radiation resistance. Prolonged anti-angiogenic therapy of tumors can delay tumor growth but may also increase hypoxia and HIF-1α activity. In our recent clinical trial, treatment with the anti-vascular endothelial growth factor A (VEGF-A) antibody, bevacizumab, followed by a combination of bevacizumab and radiation led to near complete necrosis in nearly half of sarcomas. Gene set enrichment analysis of microarrays from pre-treatment biopsies found the Gene Ontology category “Response to hypoxia” was upregulated in poor responders, and hierarchical clustering based on 140 hypoxia-responsive genes separated poor responders from good responders. The most commonly used chemotherapeutic drug for sarcomas, doxorubicin (Dox), was recently found to block HIF-1α binding to DNA at low metronomic doses. We thus examined Dox treatment in 4 sarcoma cell lines, and found Dox at low concentrations (1-10 uM) blocked HIF-1α induction of VEGF-A by 84-97%, while inhibition of other HIF-1α-target genes including CA9, c-Met and FOXM1 was variable. HT1080 sarcoma xenografts had increased hypoxia and/or HIF-1α activity with increasing tumor size and with anti-VEGF receptor antibody (DC101) treatment. Combining DC101 and metronomic Dox had a synergistic effect in suppressing growth of HT1080 xenografts, primarily via induction of tumor endothelial cell apoptosis. In conclusion, sarcomas respond to increased hypoxia by expressing HIF-1α-target genes which may promote resistance to anti-angiogenic and other therapies. Metronomic Dox can block HIF-1α activation of target genes and works synergistically with anti-VEGF therapy to inhibit sarcomas. Pre-treatment biopsies were collected from 16 human sarcoma. The gene expression analysis was performed using Illumina platform.
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Project description:Bone is a highly dynamic tissue undergoing continuous formation and resorption. Here, we investigated differential but complementary roles of hypoxia-inducible factor (HIF)-1α and HIF-2α in regulating bone remodeling. Using RNA-seq analysis, we identified that specific genes involved in regulating osteoblast differentiation were similarly but slightly differently governed by HIF-1α and HIF-2α. We found that increased HIF-1α expression inhibited osteoblast differentiation via inhibiting RUNX2 function by upregulation of Twist2, confirmed using Hif1a conditional knockout (KO) mouse. Ectopic expression of HIF-1α via adenovirus transduction resulted in the increased expression and activity of RANKL, while knockdown of Hif1a expression via siRNA or osteoblast-specific depletion of Hif1a in conditional KO mice had no discernible effect on osteoblast-mediated osteoclast activation. The unexpected outcome was elucidated by the upregulation of HIF-2α upon Hif1a overexpression, providing evidence that Hif2a is a transcriptional target of HIF-1α in regulating RANKL expression, verified through an experiment of HIF-2α knockdown after HIF-1α overexpression. The above results were validated in an ovariectomized- and aging-induced osteoporosis model using Hif1a conditional KO mice. Our findings conclude that HIF-1α plays an important role in regulating bone homeostasis by controlling osteoblast differentiation, and in influencing osteoclast formation through the regulation of RANKL secretion via HIF-2α modulation.
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