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SMARCB1 loss interacts with neuronal differentiation state to block maturation and impact cell stability

ABSTRACT: We conducted RNA sequencing of control and SMARCB1 knockdown cells at various neural differentiation states

ORGANISM(S): Homo sapiens

PROVIDER: GSE157012 | GEO | 2020/10/01

REPOSITORIES: GEO

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SMARCB1 loss interacts with neuronal differentiation state to block maturation and impact cell stability.

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SMARCB1 loss interacts with neuronal differentiation state to block maturation in an organoid model

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SMARCB1 loss interacts with neuronal differentiation state to block maturation and impact cell stability

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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

2013-12-31 | E-GEOD-46017 | biostudies-arrayexpress

SMARCB1 Loss in Poorly-differentiated Chordomas Drives Tumor Progression

Project description:Poorly-differentiated (PD) chordoma, a tumor found mainly in children, adolescents and young adults is a rare, aggressive tumor originating from notochordal tissue, with limited therapeutic options. SMARCB1, a core component of the BAF and PBAF chromatin remodeling complexes, is the most frequently mutated gene in PD chordomas, the most aggressive form of this cancer. In this study, we employed cellular models of SMARCB1-negative PD chordomas to characterize expression of SWI/SNF complex members and determine the impact of SMARCB1 re-expression on cell growth as well as the transcriptional landscape by RNA-seq. We generated 2 SMARCB1-negative PD chordoma cell lines, CH22 and UM-Chor5, with an inducible SMARCB1 expression system. After 72 hours of induction of SMARCB1 re-expression, we observed continued growth of both SMARCB1-negative PD chordoma cell lines. This is in striking contrast to SMARCB1-deficient rhabdoid cell lines, where we found SMARCB1 re-expression inhibits growth completely. We also found the lack of growth inhibition may arise from the loss of CDKN2A/p16INK4A expression in all poorly differentiated chordoma cell lines which correlated well with the gene expression data. SMARCB1 re-expression in both CH22 and UM-Chor5 cells showed downregulation for rRNA and RNA processing as well as metabolic processing. Upregulated differentially expressed genes included those involved in cell adhesion, cell migration, and development. Taken together, our data establish SMARCB1 re-expression in PD chordomas alters the repertoire of SWI/SNF complexes, perhaps restoring those associated with cellular differentiation. Our findings support a model where SMARCB1 inactivation blocks the conversion of growth-promoting SWI/SNF complexes to differentiation-inducing ones.

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Effect of SMARCB1 loss in bladder cancer tumor growth and metastasis.

Project description:To investigate the loss of SMARCB1 , a critical component of SWI/SNF complex in bladder cancer tumorigenesis and metastasis. We investigated the loss by generating SMARCB1 KO cells by CRISPR and rescuing the expression of SMARCB1 by lentivirus in the KO cell line. The cell lines were implanted orthotopically into bladder wall to investigate its effects on tumor growth and metastatic phenotype.

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Gene expression analysis of human haploid cells (HAP1) depleted of SMARCB1 and SMARCA4

Project description:The aim of this study is to analyze the change in genome wide expression levels in HAP1 cells upon loss of SMARCB1, SMARCA4 or both these genes together. The SMARCB1 and SMARCA4 genes were the hits from a genome wide screen involving genetrap mutagenesis to find new players that are involved in sensitivity to Doxorubicin (Dox). It was found that loss of SMARCB1 and SMARCA4 genes impart resistance in HAP1 cells to Dox. To validate this, the genes were knocked out in HAP1 cells with CRISPR-Cas9 technology. Gene expression levels in SMARCB1 null, SMARCA4 null and SMARCB1-SMARCA4 double null cells were compared to wildtype HAP1 cells using RNAseq. From these experiments it was found that SMARCB1 loss caused several fold increase in ABCB1 gene levels. ABCB1 is an efflux pump in cells responsible for flushing out many small-molecule drugs. Further analysis of this gene confirmed that ABCB1 was the main factor responsible for Dox resistance upon SMARCB1 loss. In total there are four different cell types with two replicates for each cell type. Therefore, 8 samples in total.

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2013-12-31 | GSE46017 | GEO

SMARCB1 loss creates patient-specific MYC topologies that drive malignant rhabdoid tumor growth

Project description:Malignant rhabdoid tumor (MRT) is a highly malignant and often lethal childhood cancer. MRTs are genetically defined by bi-allelic inactivating mutations in SMARCB1, a member of the BRG1/BRM-associated factors (BAF) chromatin remodeling complex. Here, we studied derailed regulatory landscapes as a consequence of SMARCB1 loss in the context of MRT. Our multi-omics approach on patient-derived MRT organoids revealed a dramatic reshaping of the regulatory landscape upon SMARCB1 reconstitution. Chromosome conformation capture experiments subsequently revealed patient-specific looping of distal enhancer regions with the promoter of the MYC oncogene and validation of this data in patients with combined single-cell RNA-seq and ATAC-seq.

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