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Transcription-driven cohesin accumulation is associated with secretory phenotype of senescence

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Homo sapiens

PROVIDER: GSE135093 | GEO | 2020/10/05

REPOSITORIES: GEO

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Transcription-driven cohesin accumulation is associated with secretory phenotype of senescence [HiC]

Project description:Senescence is a stable form of cell cycle arrest that is triggered in response to various pathophysiological stimuli. The three-dimensional structure of senescent cells has been previously characterised, mostly in terms of macro-domains or changes between large heterochromatic regions. In the present body of work, using a combination of HiC and targetted Capture Hi-C, we aimed to investigate the association between gene expression and local chromatin structure in senescence, particularly focusing on enhancer-promoter (EP) interactions. We show that many EP contacts are rewired in RAS-induced Senescence compared to ‘normal’, growing cells and that these are associated with cohesin binding changes and possible loop re-organisation. The genes affected by altered chromatin interactions correspond to the two main axes of senescence gene regulation: cell cycle and inflammation. Our findings are potentially relevant during ageing and in cancers with cohesin mutations, where cell cycle and inflammation are also deregulated.

2020-10-05 | GSE135090 | GEO

Transcription-driven cohesin accumulation is associated with secretory phenotype of senescence [ChIP-Seq]

2020-10-05 | GSE135088 | GEO

Transcription-driven cohesin accumulation is associated with secretory phenotype of senescence

Project description:Transcription-driven cohesin accumulation is associated with secretory phenotype of senescence

| PRJNA557421 | ENA

Transcription-driven cohesin accumulation is associated with secretory phenotype of senescence [HiC]

Project description:Transcription-driven cohesin accumulation is associated with secretory phenotype of senescence [HiC]

| PRJNA557420 | ENA

Transcription-driven cohesin accumulation is associated with secretory phenotype of senescence [ChIP-Seq]

Project description:Transcription-driven cohesin accumulation is associated with secretory phenotype of senescence [ChIP-Seq]

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Iron accumulation drives fibrosis, senescence, and the senescence-associated secretory phenotype

Project description:We found histological evidence for increased abundance of iron accumulating cells in association with fibrotic lung, kidney, and heart diseases in mice and humans. We showed that inducing iron accumulation by intratracheal iron delivery in mice is a potent inducer of inflammation, cellular senescence, and fibrosis. The aim of this study has been to understand the single cell dynamics of iron accumulation and the mechanics that link it to in vivo senescence and to fibrogenesis. To get deeper insight into how different cell types respond to iron accumulation, we performed single nuclei RNA sequencing (snRNA-seq) of lungs from mice which received a single intratracheal dose of iron 2 or 6 days prior to analysis, or PBS 6days prior to analysis (control).

2023-08-18 | E-MTAB-13032 | biostudies-arrayexpress

MLL1 is essential for the senescence-associated secretory phenotype

Project description:This SuperSeries is composed of the SubSeries listed below. Oncogene-induced senescence (OIS) and therapy-induced senescence (TIS), while tumor-suppressive, also promote procarcinogenic effects by activating the DNA damage response (DDR), which in turn induces inflammation. This inflammatory response prominently includes an array of cytokines known as the senescence-associated secretory phenotype (SASP). Previous observations link the transcription-associated methyltransferase and oncoprotein MLL1 to the DDR, leading us to investigate the role of MLL1 in SASP expression. Our findings reveal direct MLL1 epigenetic control over proproliferative cell cycle genes: MLL1 inhibition represses expression of proproliferative cell cycle regulators required for DNA replication and DDR activation, thus disabling SASP expression. Strikingly, however, these effects of MLL1 inhibition on SASP gene expression do not impair OIS and, furthermore, abolish the ability of the SASP to enhance cancer cell proliferation. More broadly, MLL1 inhibition also reduces âSASP-likeâ inflammatory gene expression from cancer cells in vitro and in vivo independently of senescence. Taken together, these data demonstrate that MLL1 inhibition may be a powerful and effective strategy for inducing cancerous growth arrest through the direct epigenetic regulation of proliferation-promoting genes and the avoidance of deleterious OIS- or TIS-related tumor secretomes, which can promote both drug resistance and tumor progression. Previously published samples GSM1135046, GSM1135044, GSM1135047, and GSM1135045 were also studied in this investigation and appear in GSE36641. This did not involve re-sequencing or re-alignment, nor any other deviation from the data protocols in that series. Refer to individual Series

2016-02-22 | E-GEOD-78142 | biostudies-arrayexpress

Architectural alterations in enhancer repertoires orchestrate senescence-associated secretory phenotype profile

Project description:This SuperSeries is composed of the SubSeries listed below.

2018-07-18 | GSE117210 | GEO

m6A independent genome-wide METTL3 and METTL14 redistribution drives senescence-associated secretory phenotype

Project description:This SuperSeries is composed of the SubSeries listed below.

2020-12-10 | GSE141994 | GEO

Mettl14-driven senescence-associated secretory phenotype (SASP) facilitates somatic reprogramming

Project description:The METTL3-METTL14 complex, as the "writer" of N6-methyladenosine (m6A), plays an important role in many biological processes. Previous studies have shown that overexpression of Mettl3 can increase the level of m6A and promotes somatic cell reprogramming. Here, we demonstrate that Mettl14, another component of the methyltransferase (MTase) complex, can significantly enhance the generation of induced pluripotent stem cells (iPSCs) in m6A independent manner. Cooperating with Oct4, Sox2, Klf4 and c-Myc (OSKM), Mettl14 transiently increased the senescence-associated secretory phenotype (SASP) gene expression in the non-reprogramming cells at the late reprogramming stage. The conditional medium in reprogramming intermediates overexpressing Mettl4 or its mutant could enhanced the reprogramming, so do IL-6, a component of SASP. Corespondingly, blocking of SASP using senolytic agent or NF-κB inhibitor impairs the effect of Mettl14 on reprogramming. . Our work highlights the m6A independent function of Mettl14 and provides new insight into the interplay between senescence and reprogramming in vitro.

2022-08-24 | GSE196475 | GEO

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