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Deacetylation of HP1g enhances multiple myeloma drug resistance through DNA damage repair and liquid-liquid phase separation

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

ORGANISM(S): Homo sapiens

PROVIDER: GSE176547 | GEO | 2021/06/11

REPOSITORIES: GEO

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Deacetylation of HP1g enhances multiple myeloma drug resistance through DNA damage repair and liquid-liquid phase separation (ChIP-seq)

Project description:Functional crosstalk between histone modifications and chromatin remodeling has emerged as a key regulatory mode of transcriptional control during drug resistance, but the underlying mechanisms are not fully understood. Here we demonstrate that HP1g coordinates histone H3 lysine 9 trimethylation (H3K9me3) to regulate chromatin dynamic and gene transcription during bortezomib resistance.Mechanistically, HP1g can interact with H3K9me3, its CD domain is responsible to read H3K9me3 to serve its function.

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Deacetylation of HP1g enhances multiple myeloma drug resistance through DNA damage repair and liquid-liquid phase separation (RNA-Seq)

Project description:Functional crosstalk between histone modifications and chromatin remodeling has emerged as a key regulatory mode of transcriptional control during drug resistance, but the underlying mechanisms are not fully understood. Here we demonstrate that HP1g regulates chromatin dynamic and gene transcription during drug resistance in multiple myeloma. To study the cellular and molecular function of HP1g during bortezomib resistance, we used RNA sequencing (RNA-seq) to generate gene expression profiling under HP1g steady overexpression in LP-1. We identified multiple genes whose expression is significantly affected by HP1g levels.

2021-06-11 | GSE176546 | GEO

Deacetylation of HP1g enhances multiple myeloma drug resistance through DNA damage repair and liquid-liquid phase separation (ATAC-Seq)

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Deacetylation of HP1g enhances multiple myeloma drug resistance through DNA damage repair and liquid-liquid phase separation

Project description:Deacetylation of HP1g enhances multiple myeloma drug resistance through DNA damage repair and liquid-liquid phase separation

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Deacetylation of HP1g enhances multiple myeloma drug resistance through DNA damage repair and liquid-liquid phase separation (ATAC-Seq)

Project description:Deacetylation of HP1g enhances multiple myeloma drug resistance through DNA damage repair and liquid-liquid phase separation (ATAC-Seq)

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Deacetylation of HP1g enhances multiple myeloma drug resistance through DNA damage repair and liquid-liquid phase separation (ChIP-seq)

Project description:Deacetylation of HP1g enhances multiple myeloma drug resistance through DNA damage repair and liquid-liquid phase separation (ChIP-seq)

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Deacetylation of HP1g enhances multiple myeloma drug resistance through DNA damage repair and liquid-liquid phase separation (RNA-Seq)

Project description:Deacetylation of HP1g enhances multiple myeloma drug resistance through DNA damage repair and liquid-liquid phase separation (RNA-Seq)

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CiRS-7 Enhances the Liquid-liquid Phase Separation of miRISC and Promotes DNA Damage Repair.

Project description:Noncoding RNAs have been found to play important roles in DNA damage repair, whereas the participation of circRNA remains undisclosed. Here, we characterized ciRS-7, a circRNA containing over 70 putative miR-7-binding sites, as an enhancer of miRISC condensation and DNA repair. Both in vivo and in vitro experiments confirmed the condensation of TNRC6B and AGO2, two core protein components of human miRISC. Moreover, overexpressing ciRS-7 largely increased the condensate number of TNRC6B and AGO2 in cells, while silencing ciRS-7 reduced it. Additionally, miR-7 overexpression also promoted miRISC condensation. Consistent with the previous report that AGO2 participated in RAD51-mediated DNA damage repair, the overexpression of ciRS-7 significantly promoted irradiation-induced DNA damage repair by enhancing RAD51 recruitment. Our results uncover a new role of circRNA in liquid-liquid phase separation and provide new insight into the regulatory mechanism of ciRS-7 on miRISC function and DNA repair.

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NONO phase separation enhances DNA damage repair by accelerating nuclear EGFR-induced DNA-PK activation.

Project description:Radioresistance is one of the main causes of cancer treatment failure, which leads to relapse and inferior survival outcome of cancer patients. Liquid-liquid phase separation (LLPS) of proteins is known to be involved in various biological processes, whereas its role in the regulation of radiosensitivity remains largely unknown. In this study, we characterized NONO, an RNA/DNA binding protein with LLPS capacity, as an essential regulator of tumor radioresistance. In vitro assay showed that NONO involved in DNA repair via non-homologous end joining (NHEJ) manner. NONO knockout significantly reduced DNA damage repair and sensitized tumor cells to irradiation in vitro and in vivo. NONO overexpression was correlated with an inferior survival outcome in cancer patients. Mechanically, NONO was associated with nuclear EGFR (nEGFR). Both irradiation and EGF treatment induced nEGFR accumulation, thereby increased the association between NONO and nEGFR. However, NONO was not a substrate of EGFR kinase. Furthermore, NONO promoted DNA damage-induced DNA-PK phosphorylation at T2609 by enhancing the interaction between EGFR and DNA-PK. Importantly, NONO protein formed high concentration LLPS droplets in vitro, and recruited EGFR and DNA-PK. Disruption of NONO droplets with LLPS inhibitor significantly reduced the interaction between EGFR and DNA-PK, and suppressed DNA damage-induced phosphorylation of T2609-DNA-PK. Taken together, LLPS of NONO recruits nuclear EGFR and DNA-PK and enhances their interaction, further increases DNA damage-activated pT2609-DNA-PK and promotes NHEJ-mediated DNA repair, finally leads to tumor radioresistance. NONO phase separation-mediated radioresistance may serve as a novel molecular target to sensitize tumor cell to radiotherapy.

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FUS-dependent liquid-liquid phase separation is important for DNA repair initiation.

Project description:RNA-binding proteins (RBPs) are emerging as important effectors of the cellular DNA damage response (DDR). The RBP FUS is implicated in RNA metabolism and DNA repair, and it undergoes reversible liquid-liquid phase separation (LLPS) in vitro. Here, we demonstrate that FUS-dependent LLPS is necessary for the initiation of the DDR. Using laser microirradiation in FUS-knockout cells, we show that FUS is required for the recruitment to DNA damage sites of the DDR factors KU80, NBS1, and 53BP1 and of SFPQ, another RBP implicated in the DDR. The relocation of KU80, NBS1, and SFPQ is similarly impaired by LLPS inhibitors, or LLPS-deficient FUS variants. We also show that LLPS is necessary for efficient γH2AX foci formation. Finally, using superresolution structured illumination microscopy, we demonstrate that the absence of FUS impairs the proper arrangement of γH2AX nanofoci into higher-order clusters. These findings demonstrate the early requirement for FUS-dependent LLPS in the activation of the DDR and the proper assembly of DSB repair complexes.

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