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Remodelling of whole-body lipid metabolism and a diabetic-like phenotype caused by loss of hepatic CDK1 and hepatocyte division

ABSTRACT: Remodelling of whole-body lipid metabolism and a diabetic-like phenotype caused by loss of hepatic CDK1 and hepatocyte division

PROVIDER: PRJNA669059 | ENA |

REPOSITORIES: ENA

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Remodelling of whole-body lipid metabolism and a diabetic-like phenotype caused by loss of hepatic CDK1 and hepatocyte division

Project description:Purpose was to identify transcriptomic changes in whole liver and isolated hepatocytes from 12 month old wild type and Cdk1 liver-specific knock-out (Cdk1 Liv-/-) mice.

2020-10-14 | GSE159498 | GEO

Remodeling of whole-body lipid metabolism and a diabetic-like phenotype caused by loss of CDK1 and hepatocyte division.

Project description:Cell cycle progression and lipid metabolism are well-coordinated processes required for proper cell proliferation. In liver diseases that arise from dysregulated lipid metabolism, proliferation is diminished. To study the outcome of CDK1 loss and blocked hepatocyte proliferation on lipid metabolism and the consequent impact on whole-body physiology, we performed lipidomics, metabolomics, and RNA-seq analyses on a mouse model. We observed reduced triacylglycerides in liver of young mice, caused by oxidative stress that activated FOXO1 to promote expression of Pnpla2/ATGL. Additionally, we discovered that hepatocytes displayed malfunctioning β-oxidation, reflected by increased acylcarnitines (ACs) and reduced β-hydroxybutyrate. This led to elevated plasma free fatty acids (FFAs), which were transported to the adipose tissue for storage and triggered greater insulin secretion. Upon aging, chronic hyperinsulinemia resulted in insulin resistance and hepatic steatosis through activation of LXR. Here, we demonstrate that loss of hepatocyte proliferation is not only an outcome but also possibly a causative factor for liver pathology.

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Loss of hepatocyte cell division leads to liver inflammation and fibrosis

Project description:Purpose was to identify transcriptomic changes in whole liver and isolated hepatocytes from 2 week old wild type and Cdk1 liver-specific knock-out (Cdk1 Liv-/-) mice.

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Project description:We performed RNA-seq across the yeast metabolic cycle (YMC) in wild-type and a strain lacking ARP5, a central component of the INO80 chromatin remodelling complex. We also perform ATAC-seq on the same samples to examine chromatin architecture across the YMC.

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Effect of Cell cycle regulator CDK1 on Cell Differentiation (RNA-IP CDK1 inh KD)

Project description:We addressed the role of cell cycle regulator CDK1 during differentiation by either inhibiting its activity with the specific inhibitor RO3306 (10µM) or by knocking its expression down using specific shRNAs, during mesendoderm differentiation. Human pluripotent stem cells (H9 cells) were synchronized in their cell cycle and then induced to differentiate into mesendoderm for 24h. shRNAs against CDK1 were induced 4 days before starting the differentiation. The CDK1 inhibitor was added to the medium 8h after the induction of differentiation. At the end of the experiment, the cells were harvested and processed for total RNA extraction. RNA-IP was carried out using RiboCluster Profiler RIP-Assay Kit (MBL) following the manufacture’s recommendations.

2021-05-31 | GSE130827 | GEO

Cdk1 controls global epigenetic landscape in embryonic stem cells

Project description:In this study, we found that in ES cells the majority of Cdk1 substrates are localized on chromatin. Cdk1 phosphorylates a large number of proteins involved in epigenetic regulation, including writers and erasers of all major histone marks. High levels of Cdk1 in ES cells phosphorylate and partially inactivate Dot1l, the histone H3 lysine 79 methyltransferase responsible for placing activating H3K79 marks on gene bodies. Decrease of Cdk1 activity during ES cell differentiation de-represses Dot1l, thereby allowing coordinated expression of differentiation genes. These analyses indicate that Cdk1 functions to maintain the epigenetic identity of ES cells.

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Small RNA-seq analysis shows reduced tRNA levels in cdk1-as1 mutants

Project description:Purpose: Determine whether Cdk1 only regulates a specific subset of tDNAs, or whether Cdk1 has a more global impact on tDNA expression; Method: We study the expression of tRNA genes in WT cells and cdk1-as1 mutants during S phase by small-RNAseq; Result: We found that expression of at least 77% of all tDNAs is significantly downregulated in S-phase in the cdk1-as1 mutant compared with the WT strain; Conclussions: Cdk1 promotes transcription of the majority of tRNA genes during the cell cycle.

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Regulation of S-phase transcription factors by Cdk1

2014-04-10 | GSE55121 | GEO

Regulation of S-phase transcription factors by Cdk1

Project description:Analysis of gene expression across the cell cycle from wild type cells, and cells expressing alleles of Yox1, Yhp1, Hcm1, and Tos4 that cannot be phosphorylated by Cdk1. Expression of S-phase and M/G1 transcripts are downregulated when phosphorylation of these factors is blocked, demonstrating that Cdk1 promotes expression of late cell cycle genes. These experiments are two-color hybridizations of RNA isolated from synchronized wild type (WT) or phosphomutant (4P) cells, compared to RNA from asyncrhonous wild type cells in mid-log phase. Wild type and mutant cells were synchronized in G1 phase, released into the cell cycle and samples collected at 15 minute intervals. Each time course was carried out in duplicate, the replicate experiment was performed as a dye swap.

2014-04-10 | E-GEOD-55121 | biostudies-arrayexpress

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Project description:Effect of Cell cycle regulator CDK1 on Cell Differentiation (RNA-IP CDK1 inh KD)

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