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SOX2 Reprograms the Esophageal Squamous Carcinoma Epigenome and Induces Endogenous Retroviral Elements and dsRNA, Thereby Promoting ADAR1 Dependence [ChIP-Seq, ATAC-Seq]

ABSTRACT: SOX2 Reprograms the Esophageal Squamous Carcinoma Epigenome and Induces Endogenous Retroviral Elements and dsRNA, Thereby Promoting ADAR1 Dependence [ChIP-Seq, ATAC-Seq]

PROVIDER: PRJNA704401 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13772250.fastq.gz	Fastqsanger.gz
	SRR13772251.fastq.gz	Fastqsanger.gz
	SRR13772252.fastq.gz	Fastqsanger.gz
	SRR13772253.fastq.gz	Fastqsanger.gz
	SRR13772254.fastq.gz	Fastqsanger.gz

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SOX2 Reprograms the Esophageal Squamous Carcinoma Epigenome and Induces Endogenous Retroviral Elements and dsRNA, Thereby Promoting ADAR1 Dependence

Project description:SOX2 Reprograms the Esophageal Squamous Carcinoma Epigenome and Induces Endogenous Retroviral Elements and dsRNA, Thereby Promoting ADAR1 Dependence

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SOX2 Reprograms the Esophageal Squamous Carcinoma Epigenome and Induces Endogenous Retroviral Elements and dsRNA, Thereby Promoting ADAR1 Dependence [RNA-Seq]

Project description:SOX2 Reprograms the Esophageal Squamous Carcinoma Epigenome and Induces Endogenous Retroviral Elements and dsRNA, Thereby Promoting ADAR1 Dependence [RNA-Seq]

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SOX2 Reprograms the Esophageal Squamous Carcinoma Epigenome and Induces Endogenous Retroviral Elements and dsRNA, Thereby Promoting ADAR1 Dependence

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

2021-03-17 | GSE167367 | GEO

SOX2 Reprograms the Esophageal Squamous Carcinoma Epigenome and Induces Endogenous Retroviral Elements and dsRNA, Thereby Promoting ADAR1 Dependence [RNA-Seq]

Project description:We analyzed ChIP-seq, chromatin accessibility and RNA-seq across mouse esophageal squamous organoids and human esophageal squamous cell cancer

2021-03-17 | GSE167365 | GEO

SOX2 Reprograms the Esophageal Squamous Carcinoma Epigenome and Induces Endogenous Retroviral Elements and dsRNA, Thereby Promoting ADAR1 Dependence [ChIP-Seq, ATAC-Seq]

Project description:We analyzed ChIP-seq, chromatin accessibility and RNA-seq across mouse esophageal squamous organoids and human esophageal squamous cell cancer

2021-03-17 | GSE167366 | GEO

Malignant A-to-I RNA editing by ADAR1 drives T-cell acute lymphoblastic leukemia relapse via attenuating dsRNA sensing

Project description:Leukemia initiating cells (LICs) are regarded as the origin of leukemia relapse and therapeutic resistance. Identifying direct stemness determinants that fuel LIC self-renewal is critical for developing targeted approaches to eliminate LICs and prevent relapse. Here, we show that the RNA editing enzyme ADAR1 is a crucial stemness factor that promotes LIC self-renewal by attenuating aberrant double-stranded RNA (dsRNA) sensing. Elevated adenosine-to-inosine (A-to-I) editing is a common attribute of relapsed T-ALL regardless of molecular subtypes. Consequently, knockdown of ADAR1 severely inhibits LIC self-renewal capacity and prolongs survival in T-ALL PDX models. Mechanistically, ADAR1 directs hyper-editing of immunogenic dsRNA to avoid detection by the innate immune sensor MDA5. Moreover, we uncovered that the cell intrinsic level of MDA5 dictates the dependency on ADAR1-MDA5 axis in T-ALL. Collectively, our results show that ADAR1 functions as a self-renewal factor that limits the sensing of endogenous dsRNA. Thus, targeting ADAR1 presents an effective therapeutic strategy for eliminating T-ALL LICs.

2023-12-31 | GSE221112 | GEO

ADAR1 utilizes independent mechanisms to suppress MDA5 and PKR activation by cellular double-stranded RNA

Project description:The antiviral defense in vertebrates requires the innate immune system to sense foreign “non-self” nucleic acids while avoiding “self” nucleic acids, which is accomplished by an intricate system. Cellular double-stranded RNAs (dsRNAs) are edited by the RNA editing enzyme ADAR1 to prevent their dsRNA structure pattern from being recognized as viral dsRNA. Lack of RNA editing by ADAR1 enables activation of MDA5, a cytosolic dsRNA sensor, by cellular dsRNA. Additional RNA editing- independent functions of ADAR1 have been proposed, but the specific mechanism remains elusive. Here we demonstrate that RNA binding by ADAR1, independent of its editing activity, restricts the activation of PKR, another cytosolic dsRNA sensor, by cellular dsRNA. Mechanistically, the loss of ADAR1 editing caused MDA5 activation to induce interferon signaling, while a lack of ADAR1 protein or its dsRNA binding ability led to PKR activation, with subsequent stress granule formation and proliferation arrest. Based on these findings we rescued the Adar1−/− mice from embryonic lethality to adulthood by deleting both MDA5 and PKR, in contrast to the limited rescue of Adar1−/− mice by removing MDA5 or PKR alone. Our findings reveal a multifaceted contribution of ADAR1 in regulating the immunogenicity of “self” dsRNAs. Furthermore, ADAR1 is an immuno-oncology target for drug development, and the separation of ADAR1’s RNA editing and binding functions provides mechanistic insights for such developments.

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ADAR1 suppression in human astrocytes

Project description:ADAR1 regulates the accumulation of endeognouse double-stranded RNA (dsRNA), a pro-inflammatory/innate immune activator. The purpose of this study was to measure the effects of ADAR1 suppression in human astrocytes and determine RNAs regulated by ADAR1. Primary human astrocytes were culture and transfected with a scramble or ADAR1 siRNA. RNA was isolated from these cells for total RNA-seq to analyze changes in gene/repetitive element expression and RNA editing.

2023-09-07 | GSE225369 | GEO

Epigenetic therapy induces transcription of Inverted SINEs and ADAR1 dependency

Project description:In this study we show that intronic and intergenic SINE elements, specifically inverted repeats (IR) Alus, are the major source of drug-induced immunogenic dsRNA. These IR-Alus are frequently located downstream of ‘orphan’ CpG Islands (CGIs). In mammals, the enzyme Adenosine Deaminases Acting on RNA (ADAR1) targets and destabilizes IR-Alu dsRNA, which prevents activation of MDA5. We found that ADAR1 establishes a negative feedback loop, restricting the viral mimicry response to epigenetic therapy. Depletion of ADAR1 in patient-derived cancer cells potentiates the efficacy of epigenetic therapy, restraining tumour growth and reducing cancer initiation. Thus, epigenetic therapies trigger viral mimicry by inducing a subset of IR-Alus, leading to an ADAR1 dependency. Our findings suggest that combining epigenetic therapies with ADAR1 inhibitors represents a promising new strategy for cancer treatment.

2020-10-20 | GSE145639 | GEO

The RNA editing enzyme ADAR1 is a key regulatory of innate immune responses to RNA

Project description:The ADAR RNA editing enzymes deaminate adenosine bases to inosines in cellular RNAs, recoding open reading frames. Human ADAR1 mutations cause Aicardi-Goutieres Syndrome (AGS) and Adar1 mutant mice showing an aberrant interferon response and death by embryonic day E12.5 model the human disease. Searches have not identified key ADAR1 RNA editing sites recoding immune/haematopoietic proteins but editing is widespread in Alu sequences. We show that Adar1 embryonic lethality is rescued in Adar1; Mavs double mutant mice in which general antiviral responses to cytoplasmic dsRNA are prevented. We propose that inosine bases are epigenetic marks identifying cellular RNA as innate immune ÒselfÓ. Consistent with this idea we show that an editing-active cytoplasmic ADAR is required to prevent aberrant immune responses in Adar1 mutant mouse embryo fibroblasts. No dramatic increase in repetitive transcripts is observed. AGS mutations in ADAR1 affect editing by the interferon-inducible cytoplasmic ADAR1 isoform. RNA-seq expression profiling in Adar1 and Adar1/Mavs knockout mice embryos.

2014-12-19 | E-GEOD-62917 | biostudies-arrayexpress

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