Effect of Mll3 deletion in MCF7 cells
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PROVIDER: PRJNA719656 | ENA |
REPOSITORIES: ENA
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Project description:MLL3 inactivation mutations occurs frequently in human breast cancer. To understand the function of MLL3 inactivation, we compared the gene expression profiles of the vector control (WT) and Mll3-knockout MCF7 cells generated by CRISPR-CAS9. Affymetrix human Gene 2.0ST arrays were used for microarray.
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Project description:To determine the effect of Mll3 deletion on H3K4me3 Chip signals in intestinal stem cell populations. This data has been described in the following article : Discovery of candidate disease genes in ENU-induced mouse mutants by large-scale sequencing, including a splice-site mutation in nucleoredoxin. Boles MK et al PLoS Genet. 2009 Dec;5(12) and its further analysis can be freely submitted for publication. For information on the proper use of data shared by the Wellcome Trust Sanger Institute (including information on acknowledgement), please see http://www.sanger.ac.uk/datasharing/ Abstract: Briefly we wanted to determine the effect of Mll3 deletion on H3K4me3 binding in cells of the intestine and to compare these to the H3K4me3 pattern found in wildtype animals.
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Project description:MLL3 inactivation mutations occurs frequently in human breast cancer. To understand the function of MLL3 inactivation, we compared the gene expression profiles of the vector control (WT) and Mll3-null mouse mammary stem cells generated by CRISPR. Affymetrix mouse Gene 2.0ST ships were used for microarray.
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Project description:CDK4/6 inhibitor, abemaciclib induced cell cycle arrest and senescence in breast cancer. We reported that deletion of TP53 prevented the senescence features. In this study, we knockout TP53 by CRISPR Cas9 system and treated MCF7 cells and p53 knockout cells with abemaciclib for up to 29 days to identify the difference of senescence associated secretary phenotype genes and cell cycle related genes. features.
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Project description:CDK4/6 inhibitor, abemaciclib induced cell cycle arrest and senescence in breast cancer. We reported that deletion of TP53 prevented the senescence features. In this study, we knockout TP53 by CRISPR Cas9 system and treated MCF7 cells and p53 knockout cells with abemaciclib for up to 29 days to identify the difference of senescence associated secretary phenotype genes and cell cycle related genes. features.
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Project description:Enhancers play a key role in regulating cell type-specific gene expression and are marked by histone modifications such as methylation and acetylation. Mono-methylation of lysine 4 on histone H3 (H3K4me1) initially primes enhancers, preceding enhancer activation via acetylation of lysine 27 on histone H3 (H3K27ac). MLL4 is a major enhancer H3K4 mono-methyltransferase with partial functional redundancy with MLL3. However, how H3K4me1 affects enhancer regulation in cell differentiation has remained unclear. By screening several lysine-to-methionine mutants of H3.3, we first found that depletion of H3K4 methylation by H3.3K4M mutation severely impairs adipogenesis in culture. Using tissue-specific expression of H3.3K4M in mice, we further demonstrate that H3.3K4M inhibits adipose tissue and muscle development in vivo. Mechanistically, H3.3K4M destabilizes MLL3/4 proteins but not other members of the mammalian Set1-like H3K4 methyltransferase family and prevents MLL3/4-mediated enhancer activation in adipogenesis. Using tissue-specific deletion of the enzymatic SET domain of MLL3/4 in mice, we also show that deletion of the SET domain prevents adipose tissue and muscle development in vivo and inhibits adipogenesis by destabilizing MLL3/4 in vitro. Notably, H3.3K4M expression mimics MLL3/4 SET domain deletion in preventing adipogenesis. Interestingly, H3.3K4M does not affect adipose tissue maintenance and function, suggesting that MLL3/4-mediated H3K4 methylation is dispensable for the maintenance and function of differentiated adipocytes. Together, our findings suggest that H3.3K4M targets MLL3/4 to prevent enhancer activation in adipogenesis.
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Project description:Phenotypic plasticity associated with the hybrid epithelial-mesenchymal transition (EMT) state is crucial to metastatic seeding and outgrowth. We showed that deletion of the epigenetic regulator MLL3, a tumor suppressor frequently altered in human cancer, promoted the acquisition of the hybrid EMT state in both epithelial and mesenchymal breast cancer cells by facilitating EMT and MET, distinct from other known EMT regulators mediating unidirectional changes. MLL3 deletion greatly increased metastasis by enhancing metastatic outgrowth during colonization. Mechanistically, MLL3 loss led to IFNγ signaling upregulation, which contributes to the induction of hybrid EMT cells and the enhanced metastatic capacity.
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