Interplay between Genetic Variation and Nutrition Challenge Controls Hepatic Diurnal Rhythms [ATAC-seq]
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE297115 | GEO | 2025/08/25
REPOSITORIES: GEO
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Project description:Variation in diurnal rhythms contributes to the risk of multiple diseases, yet the genomic and epigenomic basis remains largely unknown. Here, we show that SNPs in enhancer and promoter regions genome-wide contribute to variations in human diurnal rhythms. Differential rhythmic gene expression and physiological responses to diet-induced obesity in mice with different genetic backgrounds are linked to time-dependent enhancer-promoter interactions (EPI) regulated by cis-regulatory SNPs and transcription factors (TFs) like ESRRγ. Hepatocyte-specific Esrrγ knockout alters rhythmic processes in liver, including triglyceride synthesis and lipid droplet formation, across mouse strains. Moreover, motifs of ESRRγ and other lipid metabolism-related TFs are enriched in individual-specific EPIs harboring SNPs to control rhythmic genes in patients with MAFLD. SNPs located in these sites are correlated with hepatic metabolic traits. Thus, SNPs and TFs interdependently form the genomic and epigenomic basis for diurnal rhythm variation, contributing to disease risk.
2025-08-25 | GSE278922 | GEO
Project description:Variation in diurnal rhythms contributes to the risk of multiple diseases, yet the genomic and epigenomic basis remains largely unknown. Here, we show that SNPs in enhancer and promoter regions genome-wide contribute to variations in human diurnal rhythms. Differential rhythmic gene expression and physiological responses to diet-induced obesity in mice with different genetic backgrounds are linked to time-dependent enhancer-promoter interactions (EPI) regulated by cis-regulatory SNPs and transcription factors (TFs) like ESRRγ. Hepatocyte-specific Esrrγ knockout alters rhythmic processes in liver, including triglyceride synthesis and lipid droplet formation, across mouse strains. Moreover, motifs of ESRRγ and other lipid metabolism-related TFs are enriched in individual-specific EPIs harboring SNPs to control rhythmic genes in patients with MAFLD. SNPs located in these sites are correlated with hepatic metabolic traits. Thus, SNPs and TFs interdependently form the genomic and epigenomic basis for diurnal rhythm variation, contributing to disease risk.
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Project description:Variation in diurnal rhythms contributes to the risk of multiple diseases, yet the genomic and epigenomic basis remains largely unknown. Here, we show that SNPs in enhancer and promoter regions genome-wide contribute to variations in human diurnal rhythms. Differential rhythmic gene expression and physiological responses to diet-induced obesity in mice with different genetic backgrounds are linked to time-dependent enhancer-promoter interactions (EPI) regulated by cis-regulatory SNPs and transcription factors (TFs) like ESRRγ. Hepatocyte-specific Esrrγ knockout alters rhythmic processes in liver, including triglyceride synthesis and lipid droplet formation, across mouse strains. Moreover, motifs of ESRRγ and other lipid metabolism-related TFs are enriched in individual-specific EPIs harboring SNPs to control rhythmic genes in patients with MAFLD. SNPs located in these sites are correlated with hepatic metabolic traits. Thus, SNPs and TFs interdependently form the genomic and epigenomic basis for diurnal rhythm variation, contributing to disease risk.
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Project description:Diurnal oscillations of gene expression controlled by the circadian clock underlie rhythmic physiology across most living organisms. Although such rhythms have been extensively studied at the level of transcription and mRNA accumulation, little is known about the accumulation patterns of proteins. Here, we quantified temporal profiles in the murine hepatic proteome under physiological light–dark conditions using stable isotope labeling by amino acids quantitative MS. To measure the daily accumulation of proteins, we designed an SILAC MS experiment, in which total protein extracts were harvested from C57BL/6J mice every 3 h for 2 d (eight samples per day). Relative protein abundance in each of 16 samples was quantified against a common reference sample labeled using the SILAC method. The generated mass spectra allowed the identification of a total of 5,827 distinct proteins, of which 70% yielded relative measurements in at least 8 of 16 samples. Our analysis identified over 5,000 proteins, of which several hundred showed robust diurnal oscillations with peak phases enriched in the morning and during the night and related to core hepatic physiological functions. Combined mathematical modeling of temporal protein and mRNA profiles indicated that proteins accumulate with reduced amplitudes and significant delays, consistent with protein half-life data. Moreover, a group comprising about one-half of the rhythmic proteins showed no corresponding rhythmic mRNAs, indicating significant translational or posttranslational diurnal control. Such rhythms were highly enriched in secreted proteins accumulating tightly during the night. Also, these rhythms persisted in clock-deficient animals subjected to rhythmic feeding, suggesting that food-related entrainment signals influence rhythms in circulating plasma factors
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Project description:Rhythmic intraorgan communication coordinates environmental signals and cell-intrinsic clock to maintain organ homeostasis. Hepatocyte-specific knockout of core components of the molecular clock, Rev-erba and b (ReverbhDKO), alters cholesterol and lipid metabolism in hepatocytes as well as rhythmic gene expression in non-parenchymal cells (NPC) of the liver. Here we report that in diet induced obesity (DIO)-caused fatty liver, hepatocyte SREBP cleavage-activating protein (SCAP) is required for ReverbhDKO-induced diurnal rhythmic remodeling and epigenomic reprogramming in Kupffer cells (KC). Integrative analyses of isolated hepatocytes and Kupffer cells uncovered potential signals, including secreted polypeptides and metabolites, that gain rhythmicity in the absence of REV-ERBs in a SCAP-dependent manner. These results shed light on the signaling mechanisms by which hepatocytes regulate diurnal rhythms in NPCs in DIO and fatty liver disease.
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Project description:Rhythmic intraorgan communication coordinates environmental signals and cell-intrinsic clock to maintain organ homeostasis. Hepatocyte-specific knockout of core components of the molecular clock, Rev-erba and b (ReverbhDKO), alters cholesterol and lipid metabolism in hepatocytes as well as rhythmic gene expression in non-parenchymal cells (NPC) of the liver. Here we report that in diet induced obesity (DIO)-caused fatty liver, hepatocyte SREBP cleavage-activating protein (SCAP) is required for ReverbhDKO-induced diurnal rhythmic remodeling and epigenomic reprogramming in Kupffer cells (KC). Integrative analyses of isolated hepatocytes and Kupffer cells uncovered potential signals, including secreted polypeptides and metabolites, that gain rhythmicity in the absence of REV-ERBs in a SCAP-dependent manner. These results shed light on the signaling mechanisms by which hepatocytes regulate diurnal rhythms in NPCs in DIO and fatty liver disease.
2023-04-04 | GSE206318 | GEO
Project description:Rhythmic intraorgan communication coordinates environmental signals and cell-intrinsic clock to maintain organ homeostasis. Hepatocyte-specific knockout of core components of the molecular clock, Rev-erba and b (ReverbhDKO), alters cholesterol and lipid metabolism in hepatocytes as well as rhythmic gene expression in non-parenchymal cells (NPC) of the liver. Here we report that in diet induced obesity (DIO)-caused fatty liver, hepatocyte SREBP cleavage-activating protein (SCAP) is required for ReverbhDKO-induced diurnal rhythmic remodeling and epigenomic reprogramming in Kupffer cells (KC). Integrative analyses of isolated hepatocytes and Kupffer cells uncovered potential signals, including secreted polypeptides and metabolites, that gain rhythmicity in the absence of REV-ERBs in a SCAP-dependent manner. These results shed light on the signaling mechanisms by which hepatocytes regulate diurnal rhythms in NPCs in DIO and fatty liver disease.
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Project description:Diurnal oscillations of gene expression are a hallmark of rhythmic physiology across most living organisms. Such oscillations are controlled by the interplay between the circadian clock and feeding rhythms. While rhythmic mRNA accumulation has been extensively studied, comparatively less is known about their transcription and translation. Here, we quantified simultaneously temporal transcription, accumulation, and translation of mouse liver mRNAs under physiological light-dark conditions and ad libitum or night-restricted feeding in wild-type and Bmal1 deficient animals. We found that rhythmic transcription predominantly drives rhythmic mRNA accumulation and translation for a majority of genes. Comparison of wild-type and Bmal1 KO mice shows that circadian clock and feeding rhythms have broad impact on rhythmic genes expression, Bmal1 deletion having surprisingly more impact at the post-transcriptional level. Translation efficiency is differentially regulated during the diurnal cycle for genes with 5â-TOP sequences and for genes involved in mitochondrial activity and harboring a TISU motif. The increased translation efficiency of 5â-TOP and TISU genes is mainly driven by feeding rhythms but Bmal1 deletion impacts also amplitude and phase of translation, including TISU genes. Together this study emphasizes the complex interconnections between circadian and feeding rhythms at several steps ultimately determining rhythmic gene expression and translation. RNA-Seq from total RNA of mouse liver during the dirunal cycle. Time-series mRNA profiles of wild type (WT) and Bmal -/- mice under ad libitum and night restriced feeding regimen were generated by deep sequencing.
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Project description:The human striatum can be subdivided into the caudate, putamen, and nucleus accumbens (NAc). Each of these structures have some overlapping and some distinct functions related to motor control, cognitive processing, motivation, and reward. Previously, we used a “time of death” approach to identify diurnal rhythms in RNA transcripts in human cortical regions. Here, we identify molecular rhythms across the three striatal subregions collected from postmortem human brain tissue in subjects without psychiatric or neurological disorders. Core circadian clock genes are rhythmic across all three regions and show strong phase concordance across regions. However, the putamen contains a much larger number of significantly rhythmic transcripts than the other two regions. Moreover, there are many differences in pathways that are rhythmic across regions. Strikingly, the top rhythmic transcripts in NAc (but not the other regions) are predominantly snoRNAs and lncRNAs, suggesting that a completely different mechanism might be used for the regulation of diurnal rhythms in translation and/or RNA processing in the NAc versus the other regions. Further, although the NAc and putamen are generally in phase with regards to timing of expression rhythms, the NAc and caudate, and caudate and putamen, have several clusters of discordant rhythmic transcripts, suggesting a temporal wave of specific cellular processes with the caudate preceding the other regions. Taken together, these studies reveal distinct transcriptome rhythms across the human striatum and are an important step in helping to understand the normal function of diurnal rhythms in these regions and how disruption could lead to pathology.
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