Effects of extensive fasting on hepatic transcription
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ABSTRACT: Temporally restricted feeding has a profound effect on the hepatic circadian clock. While the circadian clock is largely unaffected by by extensive fasting, many transcripts are known to be affected by a fasting paradigm. This dataset shows the effect of extensive fasting on dynamic gene expression in the liver
Project description:Temporally restricted feeding has a profound effect on the hepatic circadian clock. While the circadian clock is largely unaffected by by extensive fasting, many transcripts are known to be affected by a fasting paradigm. This dataset shows the effect of extensive fasting on dynamic gene expression in the liver C57/B6 mice were entrained to ad libitum feeding schedule for two weeks. They were then released into constant were food was withdrawn at CT16. On the second day in constant darkness tissue was collected at the indicated timepoints. Total RNA was extracted and 5ug of total RNA was used for the standard Affymetrix protocol of amplification, labeling and hybridization
Project description:Temporally restricted feeding has a profound effect on the circadian clock. Fasting and feeding paradigms are known to influence hepatic transcription. This dataset shows the dynamic effects of refeeding mice after a 24hour fasting period.
Project description:Temporally restricted feeding has a profound effect on the circadian clock. Fasting and feeding paradigms are known to influence hepatic transcription. This dataset shows the dynamic effects of refeeding mice after a 24hour fasting period. Mice were entrained for two weeks under ad libitum access to food. Mice were then released into constant darkness and food was withdrawn at CT4 on the first day in constant darkness. On the second day in constant darkness mice were either fed (Refed) or continously fasted (Fast) at CT4. Liver tissue was collected at the indicated timepoints. Total RNA was extracted and standard Affymetrix protocol were used for amplification, labeling and hybridization
Project description:The circadian gene expression in peripheral tissue displays rhythmicity which is driven by the circadian clock and feeding-fasting cycle in mammals. In this study, circadian transcriptome was performed to investigate how fasting influences circadian gene regulation.
Project description:Increased susceptibility of circadian clock mutant mice to metabolic diseases has led to the understanding that a molecular circadian clock is necessary for metabolic homeostasis. Circadian clock produces a daily rhythm in activity-rest and an associated rhythm in feeding-fasting. Feeding-fasting driven programs and cell autonomous circadian oscillator act synergistically in the liver to orchestrate daily rhythm in metabolism. However, an imposed feeding-fasting rhythm, as in time-restricted feeding, can drive some rhythm in liver gene expression in clock mutant mice. We tested if TRF alone, in the absence of a circadian clock in the liver or in the whole animal can prevent obesity and metabolic syndrome. Mice lacking the clock component Bmal1 in the liver, Rev-erb alpha/beta in the liver or cry1-/-;cry2-/- (CDKO) mice rapidly gain weight and show genotype specific increased susceptibility to dyslipidemia, hypercholesterolemia and glucose intolerance under ad lib fed condition. However, when the mice were fed the same diet under time-restricted feeding regimen that imposed 10 h feeding during the night, they were protected from weight gain and other metabolic diseases. Transcriptome and metabolome analyses of the liver from there mutant mice showed TRF reduces de novo lipogenesis, increased beta-oxidation independent of a circadian clock. TRF also enhanced cellular defense to metabolic stress. These results suggest a major function of the circadian clock in metabolic homeostasis is to sustain a daily rhythm in feeding and fasting. The feeding-fasting cycle orchestrates a balance between nutrient stress and cellular response to maintain homeostasis.
Project description:This SuperSeries is composed of the following subset Series: GSE13060: The effects of temporally restricted feeding on hepatic gene expression GSE13062: The effects of temporally restricted feeding on hepatic gene expression of Cry1, Cry2 double KO mice GSE13063: Effects of extensive fasting and subsequent feeding on hepatic transcription GSE13064: Effects of extensive fasting on hepatic transcription Refer to individual Series
Project description:Restricted feeding impacts the hepatic circadian clock of WT mice. Cry1, Cry2 double KO mice lack a circadian clock and are thus expected to show rhythmical gene expression in the liver. Imposing a temporally restricted feeding schedule on these mice shows how the hepatic circadian clock and rhythmic food intake regulate rhythmic transcription in parallel
Project description:Temporally restricted feeding is known to impact the circadian clock. This dataset shows the effects of temporally restricted feeding on the hepatic transcriptome.
Project description:We report a large-scale transcriptomic analysis of several tissues of a reference Drosophila melanogaster strain as well as 141 Drosophila Genetic Reference Panel (DGRP) lines at high temporal resolution. Comprehensive data analysis has identified thousands of genes under clock- and tissue-specific control. By using a molecular time table approach, we uncovered that >20% of probed DGRP lines exhibit aberrant circadian expression, and the genetic dissection of one line (DGRP-796) revelled disrupted circadian gene expression in all analysed tissues, revealing a novel deletion in the cry gene. Together, this study revealed extensive variation in tissue-specific circadian expression, which acts upon tissue-specific regulatory networks to generate local oscillations in gene expression. Moreover, the many other lines identified here can be now used to better understand the mechanisms underlying the molecular clock, from tissue-specific to more central mechanisms.
Project description:Analysis of fasting-induced change of metabolites in mice confirmed that glucose level was reduced in the liver, but unaffected in the brain of fasted mice. To explore molecular mechanisms for the preferential glucose supply to the brain upon fasting, we compared gene expression profiles of the brain between fasted and fed mice. Gene ontology (GO) term analysis revealed the enrichment of one GO term, “active membrane transporters activity”. We also showed that fasting enhances the expression of a glucose transporter Slc2a1 (Glut1) gene.