Project description:We mapped the genome-wide binding profiles of GR throughout the day/night cycle (ZT0-ZT4-ZT8-ZT12-ZT16-ZT20) by using ChIP-Seq in livers from control mice and mice fed High Fat Diet (HFD) for 12 weeks
Project description:We mapped the genome-wide binding profiles of GR throughout the day/night cycle (ZT0-ZT4-ZT8-ZT12-ZT16-ZT20) by using ChIP-Seq in livers from control mice and mice fed High Fat Diet (HFD) for 12 weeks
Project description:We mapped the genome-wide binding profiles of GR by using ChIP-Seq in livers from mice fed control or HFD diet after acute exogenous ligand (DEX) administration.
Project description:We mapped the genome-wide profiles of Histone H3K27 acetylation (two time points, ZT0 and ZT12) by using ChIP-Seq in livers from control mice and mice fed High Fat Diet (HFD) for 12 weeks
Project description:Murine RPE transcriptomes were generated for 6 time points during a 24 hour period. Our data demonstrates that genes involved in ATP generation have a high expression at night whereas genes involved in β-oxidation and cholesterol synthesis show a high expression in the morning. Additionally, genes were identified in the glycerophospholipid metabolism pathway, suggesting the generation of glycerophospholipids at night. Finally, genes involved in intracellular trafficking with different expression patterns during the day-night cycle were identified and we identified genes involved in actin cytoskeleton building, remodelling and crosslinking with a high expression in the morning.
Project description:The Glucocorticoid Receptor (GR) is a potent metabolic regulator and a major drug target. While GR was shown to play various important roles in circadian biology, its rhythmic genomic actions have never been studied. Here we mapped GR’s genome-wide chromatin occupancy in mouse livers throughout the day/night cycle. We show how GR partitions metabolic processes during fasting (cellular maintenance, gluconeogenesis) and feeding (lipid and amino acid metabolism) by time-dependent binding and target gene regulation. Highlighting the dominant role GR plays in synchronizing circadian pathways, we find that the majority of oscillating genes harbor GR binding sites and depend on GR for amplitude stability . Surprisingly, this rhythmic pattern is altered by exposure to high fat diet in a ligand-independent manner. We show how the remodeling of oscillatory gene expression and GR binding result from a concomitant increase with Stat5 co-occupancy in obese mice, and that loss of GR reduces circulating glucose and triglycerides differentially during feeding and fasting. Altogether, our findings highlight GR’s fundamental role in the rhythmic orchestration of hepatic metabolism.
Project description:In order to circumvent environmental changes throughout fruit development, young and ripening berries were sampled simultaneously on continuously flowering microvines acclimated to controlled circadian light and temperature changes. Gene expression profiles along fruit development were monitored during both day and night with whole genome microarray Nimbelgen® vitis 12x, yielding a total number of 9273 developmentally modulated probesets. All day-detected transcripts were modulated at night, whereas 1755 genes were night-specific. Very similar developmental patterns of gene expression were observed upon independent hierarchical clustering of day and night data, whereas functional categories of allocated transcripts varied according to time of the day. Many transcripts within pathways, known to be upregulated during ripening, in particular those linked to secondary metabolism exhibited a clearer developmental regulation at night than during the day. Functional enrichment analysis also indicated that diurnally modulated genes considerably varied during fruit development, with a shift from cellular organization and photosynthesis in green berries to secondary metabolism and stress-related genes in ripening ones. These results reveal critical changes in gene expression during night development that differ from day development which have not been observed in other transcriptomic studies on fruit development so far.