Unveiling E2F4, TEAD1 and AP-1 as regulatory transcription factors of the replicative senescence program by multi-omics analysis
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PROVIDER: PRJNA745457 | ENA |
REPOSITORIES: ENA
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Project description:Senescence, a stable state of growth arrest, affects many physiological and pathophysiological processes, especially aging. Previous work has indicated that transcription factors (TFs) play a role in regulating senescence. However, a systematic study of regulatory TFs during replicative senescence (RS) using multi-omics analysis is still lacking. Here, we generated time-resolved RNA-seq, reduced representation bisulfite sequencing (RRBS) and ATAC-seq datasets during RS of mouse skin fibroblasts, which demonstrated that an enhanced inflammatory response and reduced proliferative capacity were the main characteristics of RS in both the transcriptome and epigenome. Through integrative analysis and genetic manipulation, we found that transcription factors E2F4, TEAD1 and AP-1 are key regulators of RS. Overexpression of E2f4 improved cellular proliferative capacity, attenuated SA-β-Gal activity and changed RS-associated differentially methylated sites (DMSs). Moreover, knockdown of Tead1 attenuated SA-β-Gal activity and partially altered the RS-associated transcriptome. In addition, knockdown of Atf3, one member of AP-1 superfamily TFs, reduced Cdkn2a (P16) expression in pre-senescent fibroblasts. Taken together, results of this study identified transcription factors regulating the senescence program through multi-omics analysis, providing potential therapeutic targets for anti-aging.
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Project description:Senescence, a stable state of growth arrest, affects many physiological and pathophysiological processes, especially aging. Previous work has indicated that transcription factors (TFs) play a role in regulating senescence. However, a systematic study of regulatory TFs during replicative senescence (RS) using multi-omics analysis is still lacking. Here, we generated time-resolved RNA-seq, reduced representation bisulfite sequencing (RRBS) and ATAC-seq datasets during RS of mouse skin fibroblasts, which demonstrated that an enhanced inflammatory response and reduced proliferative capacity were the main characteristics of RS in both the transcriptome and epigenome. Through integrative analysis and genetic manipulation, we found that transcription factors E2F4, TEAD1 and AP-1 are key regulators of RS. Overexpression of E2f4 improved cellular proliferative capacity, attenuated SA-β-Gal activity and changed RS-associated differentially methylated sites (DMSs). Moreover, knockdown of Tead1 attenuated SA-β-Gal activity and partially altered the RS-associated transcriptome. In addition, knockdown of Atf3, one member of AP-1 superfamily TFs, reduced Cdkn2a (P16) expression in pre-senescent fibroblasts. Taken together, results of this study identified transcription factors regulating the senescence program through multi-omics analysis, providing potential therapeutic targets for anti-aging.
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Project description:Unveiling E2F4, TEAD1 and AP-1 as regulatory transcription factors of the replicative senescence program by multiomics analysis
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Project description:Deregulation of RNA polymerase II (RNAPII) by oncoproteins, such as transcription factor Myc, interferes with DNA replication and is a major source of DNA damage and genomic instability. Ubiquitination is a key pathway controlling RNAPII activity via modification of RNAPII subunits or associated regulatory proteins. We uncover a mechanism for genome maintenance by ubiquitin ligase Trim33 and transcription factor E2f4. We show that Trim33 promotes E2f4 protein turnover, restricting interactions of E2f4 with chromatin and with the Recql DNA helicase. Replicative stress blunts Trim33-dependent regulation, which stimulates E2f4 and Recql recruitment to chromatin and facilitates recovery of DNA replication. Deletion of Trim33 triggers chronic recruitment of Recql to chromatin and accelerates DNA replication under stress, accompanied by compromised DDR signaling and DNA repair. Depletion of Trim33 in Myc-overexpressing cells leads to accumulation of replication-associated DNA damage and delays Myc-driven tumorigenesis. We propose that the Trim33-E2f4-Recql axis provides a mechanism to control DNA replication at transcriptionally active chromatin to maintain genome integrity.
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Project description:TEAD1 acts as a key molecule of muscle development, and trans-activates multiple target genes involved in cell proliferation and differentiation pathways. However, its target genes in skeletal muscles, regulatory mechanisms and networks are unknown. Here, we use ChIP-on-chip to identify direct target genes of TEAD1. All animal procedures were performed according to protocols approved by Hubei Province, P. R. China for Biological Studies Animal Care and Use Committee. Skeletal muscle tissues were collected from three adult Kunming mice.
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Project description:Purpose: The goal of this study is to determine the regulatory role of tead1 in β-cells by analyzing the transcriptomal changes with Tead1 deletion in β-cells Methods: Isolated islet mRNA profiles of β-cell Tead1 KO mice compared to control floxed mice at 1 year of age were assessed by RNA-seq using Illumina Hiseq2500. The sequence reads that passed quality filters were analyzed at the transcript isoform level using the CLC genomic workbench. qRT-PCR validation was performed using SYBR Green assays Conclusions: Our study represents the first detailed analysis of beta cell transcriptomes following Tead1 deletion in beta cells.
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Project description:Cellular replicative senescence, a state of permanent cell-cycle arrest that occurs following an extended period of cell division in culture, has been linked to organismal aging, tissue repair and tumorigenesis. In this study, we comparatively investigated the global lipid profiles and mRNA content of proliferating and senescent-state BJ fibroblast cells. We found that both the expression levels of lipid-regulating genes, as well as the abundance of specific lipid families, are actively regulated. We further found that 19 polyunsaturated triacylglycerol species showed the most prominent changes during replicative senescence. We argue that diversion of polyunsaturated fatty acids to glycerolipid biosynthesis could be responsible for the accumulation of specific triacylglycerols. This, in turn, could be one of the cellular mechanisms to prevent lipotoxicity under increased oxidative stress conditions observed during replicative senescence. Collectively, our results place regulation of specific lipid species to a central role during replicative senescence.
2017-03-31 | GSE94280 | GEO
Project description:Since Tead1 binds to MCAT promoter elements to regulate many muscle-specific genes, we performed a global transcriptome analysis in Tead1-deleted adult mouse hearts to assess Tead1 regulated pathways critical to CM function.
2018-07-13 | GSE85038 | GEO
Project description:Purpose: The goal of this study is to determine the regulatory role of Tead1 in β-cells by analyzing the Tead1 cistrome and open chromatin in β-cells Methods: Isolated islets from WT C57bl6 mice of 12 weeks of age were flash frozen. For Chip-seq they were fixed with formaldehyde and then after sonication, IP was performed with Anti-Tead1 antibody or the IgG isotype control. For ATAC-seq 100,000 of the frozen nuclei were tagmented. After DNA extraction, library construction, sequencing was performed using Illumina Hi seq2500. Conclusions: Our study represents the first detailed analysis of the Tead1 cistrome in beta cells.
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