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ABSTRACT: Whole exome sequencing of mouse SMARCB1 deficient tumors

PROVIDER: PRJNA565857 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR10127726_1.fastq.gz	Fastqsanger.gz
	SRR10127726_2.fastq.gz	Fastqsanger.gz
	SRR10127727_1.fastq.gz	Fastqsanger.gz
	SRR10127727_2.fastq.gz	Fastqsanger.gz
	SRR10127728_1.fastq.gz	Fastqsanger.gz

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Mouse Smarcb1-deficient models recapitulate subtypes of human rhabdoid tumors.

Project description:Rhabdoid Tumors (RT) are highly aggressive tumors that are frequently localized in the central nervous system (CNS) where they are termed atypical teratoid and rhabdoid tumors (ATRT). We generated conditional Smarcb1-deficient mouse model leads to CNS Smarcb1-deficient tumors. We used microarrays to compared gene expression profilings of various human and mouse tumors. Our data demonstrate that the Smarcb1-deficient mouse model recapitulates the diversity of human RT.

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Project description:To characterize tumors developing in our SMARCB1 deficient mouse model, we performed mRNA sequencing of tumors and control normal tissues

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Whole-exome sequencing (WES) of single glands from opposite side of two colorectal tumors and WES of colorectal cancer xenografts derived from single cell culture to study tumor growth dynamics

Project description:Single Gland Whole-exome sequencing: building on our prior description of multi-region WES of colorectal tumors and targeted single gland sequencing (E-MTAB-2247), we performed WES of multiple single glands from different sides (right: A and left: B) of two tumors in this study (tumor O and U) on the illumina platform using the Agilent SureSelect 2.0 or illumina Nextera Rapid Capture Exome kit (SureSelect or NRCE, as indicated in the naming of fastq files). Colorectal Cancer Xenograft Whole-exome sequencing: The HCT116 and LoVo Mismatch-Repair-deficient colorectal adenocarcinoma cell lines were obtained from the ATCC and cultured under standard conditions. For both cell lines, a single âfoundingâ cell was cloned and expanded in vitro to ~6M cells. Two aliquots of ~1M cells were subcutaneously injected into opposite flanks (right and left) of a nude mouse and tumors allowed to reach a size of ~1B cells (1cm3) before the animal was sacrificed. Tumor tissue was collected separately from the right and left lesions and DNA was extracted for WES using the illumina TruSeq Exome kit or Nextera Rapid Capture Exome expanded Kits (Truseq or NRCEe), as was DNA from the first passage population (a polyclonal tissue culture for HCT116 and a polyclonal xenograft sample for LoVo), which were employed as a control to study mutation accumulation in culture and post xenotransplantation.

2017-05-01 | E-MTAB-5547 | biostudies-arrayexpress

Transcriptional response to Smarcb1 re-expression in murine derived Smarcb1 deficient p53 null tumors

Project description:SMARCB1 (Snf5/Ini1/Baf47) is a potent tumor suppressor, the loss of which serves as the diagnostic feature in Malignant Rhabdoid Tumors (MRT) and Atypical Teratoid/Rhabdoid Tumors (AT/RT), two highly aggressive forms of pediatric neoplasms. Here, we restore Smarcb1 expression in cells derived from Smarcb1-deficient tumors which developed in Smarcb1-heterozygous p53-/- mice. Profiling Smarcb1 dependent gene expression we find genes which are dependent on Smarcb1 expression to be enriched for ECM and cell adhesion functions. We identify Igfbp7, which is related to the insulin-like growth factor binding proteins family, as a downstream target of Smarcb1 transcriptional activity, and show that re-introduction of Igfbp7 alone can hinder tumor development. Two cancer cell lines, 167 and 365, derived from Smarcb1-deficient tumors which developed in Smarcb1-heterozygous p53-/- mice were re-infected with a retro-viral vector for Smarcb1 re-expression or an empty retro-viral vector as control. Total-RNA was collected 3 days post infection so as to enrich for direct targets of Smarcb1 transcriptionaly regulated genes

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Project description:Whole-exome sequencing analysis of lineage-marked prostate primary tumors and metastases from the NPK mouse model (Nkx3.1CreERT2/+; Ptenflox/flox; KrasLSL-G12D/+; R26R-CAG-LSL-EYFP/+)

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Mus musculus

Project description:Whole-exome sequencing of TET1-deficient tumors

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Project description:Mouse Smarcb1-deficient models recapitulate subtypes of human rhabdoid tumors.

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Mus musculus

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Inhibiting EZH2 Targets Atypical Teratoid Rhabdoid Tumor by Triggering Viral Mimicry via Both RNA and DNA Sensing Pathways [CUT&RUN]

Project description:Loss of function mutations in SMARCB1 are prevalent in pediatric atypical teratoid rhabdoid tumors (ATRTs) and confer an oncogenic dependency on EZH2, providing a compelling rationale for treating these genetically defined cancers via EZH2 inhibition (EZH2i). EZH2i results in tumor regression in SMARCB1-deficient tumors in preclinical studies, but the molecular mechanism has not been fully elucidated. Here we found that the sensitivity of SMARCB1-deficient tumors to EZH2i is associated with the viral mimicry response that depends on both double-stranded RNA (dsRNA) and cytoplasmic DNA sensing pathways. Unlike other epigenetic therapies targeting transcriptional repressors, viral mimicry by EZH2i in SMARCB1-deficient tumors is not triggered by crypt initiation of endogenous retroelements, but rather mediated by increased expression of genes enriched for intronic inverted-repeat Alu (IR-Alu) elements. Interestingly, we found that interferon-stimulated genes (ISGs) are highly enriched for dsRNA-forming intronic IR-Alu elements, suggesting a positive feedback loop whereby interferon response leads to dsRNA formation from intronic ISGs and activation of viral mimicry. Moreover, EZH2i in ATRT cells also enhances the expression of full-length LINE-1 elements, leading to genomic instability and cGAS/STING response in a process dependent on reverse transcriptase activity. Supporting this mechanism, co-depletion of dsRNA sensing and cytoplasmic DNA sensing completely rescues the viral mimicry response to EZH2i in SMARCB1-deficient tumors.

2024-09-05 | GSE213248 | GEO

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