Ontology highlight
ABSTRACT:
PROVIDER: PRJNA779599 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR16916393.fastq.gz | Fastqsanger.gz | |||
| SRR16916394.fastq.gz | Fastqsanger.gz | |||
| SRR16916395.fastq.gz | Fastqsanger.gz | |||
| SRR16916396.fastq.gz | Fastqsanger.gz | |||
| SRR16916397.fastq.gz | Fastqsanger.gz |
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Project description:ApoE knockout mice were exposed to intermittent hypoxia and hypercapnia (treatment) or room air (controls). Perturbations in the gut microbiome were profiled longitudinally using LC-MS/MS to study the impact of treatment on the gut metabolome.
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Project description:Hypoxia has profound and diverse effects on aerobic organisms, disrupting oxidative phosphorylation and activating several protective pathways. Predictions have been made that exposure to mild intermittent hypoxia may be protective against more severe exposure and may extend lifespan. Here we report the lifespan effects of chronic, mild, intermittent hypoxia and short-term survival in acute severe hypoxia in four clones of Daphnia magna originating from either permanent or intermittent habitats. We test the hypothesis that acclimation to chronic mild intermittent hypoxia can extend lifespan through activation of antioxidant and stress-tolerance pathways and increase survival in acute severe hypoxia through activation of oxygen transport and storage proteins and adjustment to carbohydrate metabolism. Unexpectedly, we show that chronic hypoxia extended the lifespan in the two clones originating from intermittent habitats but had the opposite effect in the two clones from permanent habitats, which also showed lower tolerance to acute hypoxia. Exposure to chronic hypoxia did not protect against acute hypoxia; to the contrary, Daphnia from the chronic hypoxia treatment had lower acute hypoxia tolerance than normoxic controls. Few transcripts changed their abundance in response to the chronic hypoxia treatment in any of the clones. After 12 hours of acute hypoxia treatment, the transcriptional response was more pronounced, with numerous protein-coding genes with functionality in oxygen transport, mitochondrial and respiratory metabolism, and gluconeogenesis, showing up-regulation. While clones from intermittent habitats showed somewhat stronger differential expression in response to acute hypoxia than those from permanent habitats, contrary to predictions, there were no significant hypoxia-by-habitat of origin or chronic-by-acute treatment interactions. GO enrichment analysis revealed a possible hypoxia tolerance role by accelerating the molting cycle and regulating neuron survival through up-regulation of cuticular proteins and neurotrophins, respectively.
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Project description:In this study, we determined the effect of chronic consistent hypoxia (CCH) and chronic intermittent hypoxia (CIH) on global gene expression in cortical and hippocampal region of developing mouse brain using long-oligo beadschip arrays. Keywords: Gene expression profile Control-Cortex: Cortical samples from 16 days old mice were analysed on whole-genome expression chips to reveal expression profile at this developmental stage. Used as control for Chronic Hypoxia Treated cortical samples. CCH-Cortex: Cortical samples from 2-week CCH treated mice were analysed on whole-genome expression chips to reveal the changes in gene expression profile following 2-week CCH treatment. CIH-Cortex: Cortical samples from 2-week CCH treated mice were analysed on whole-genome expression chips to reveal the changes in gene expression profile following 2-week CIH treatment. Control-Hippocampus: Hippocampal samples from 16 days old mice were analysed on whole-genome expression chips to reveal expression profile at this developmental stage. Used as control for Chronic Hypoxia Treated hippocampal samples. CCH-Hippocampus: Hippocampal samples from 2-week CCH treated mice were analysed on whole-genome expression chips to reveal the changes in gene expression following 2-week CCH treatment. CIH-Hippocampus: Hippocampal samples from 2-week CCH treated mice were analysed on whole-genome expression chips to reveal the changes in gene expression following 2-week CIH treatment.
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