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A novel CRISPR activation mouse enables modelling of aggressive lymphoma and interrogation of venetoclax resistance

ABSTRACT: A novel CRISPR activation mouse enables modelling of aggressive lymphoma and interrogation of venetoclax resistance

PROVIDER: PRJNA846166 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR19543841_1.fastq.gz	Fastqsanger.gz
	SRR19543841_2.fastq.gz	Fastqsanger.gz
	SRR19543842_1.fastq.gz	Fastqsanger.gz
	SRR19543842_2.fastq.gz	Fastqsanger.gz
	SRR19543843_1.fastq.gz	Fastqsanger.gz

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A novel CRISPR activation mouse enables modelling of aggressive lymphoma and interrogation of venetoclax resistance

Project description:CRISPR technologies have advanced cancer modelling in mice, but CRISPR activation (CRISPRa) methods have not been exploited in this context. We establish a CRISPRa mouse (dCas9a-SAMKI/+ 38 ) for inducing gene expression in vivo and in vitro. Using dCas9a-SAMKI 39 primary lymphocytes, we induced B cell restricted genes in T cells and vice versa, demonstrating the power of this system. There are limited models of aggressive double hit lymphoma. Therefore, we transactivated pro-survival BCL-2 in Eµ-MycT/+;dCas9a-SAMKI/+ 42 haematopoietic stem and progenitor cells. Mice transplanted with these cells rapidly developed lymphomas expressing high BCL-2 and MYC. Unlike standard Eµ-Myc lymphomas, BCL-2 expressing lymphomas were highly sensitive to the BCL-2 inhibitor venetoclax. We performed genome-wide activation screens in these lymphoma cells and found a dominant role for the BCL-2 protein A1 in venetoclax resistance. Here we show the power of our CRISPRa model for mimicking disease and providing insights into resistance mechanisms towards targeted therapies.

2022-07-08 | GSE205509 | GEO

Generation of a CRISPR activation mouse that enables modelling of aggressive lymphoma and interrogation of venetoclax resistance.

Project description:CRISPR technologies have advanced cancer modelling in mice, but CRISPR activation (CRISPRa) methods have not been exploited in this context. We establish a CRISPRa mouse (dCas9a-SAMKI) for inducing gene expression in vivo and in vitro. Using dCas9a-SAMKI primary lymphocytes, we induce B cell restricted genes in T cells and vice versa, demonstrating the power of this system. There are limited models of aggressive double hit lymphoma. Therefore, we transactivate pro-survival BCL-2 in Eµ-MycT/+;dCas9a-SAMKI/+ haematopoietic stem and progenitor cells. Mice transplanted with these cells rapidly develop lymphomas expressing high BCL-2 and MYC. Unlike standard Eµ-Myc lymphomas, BCL-2 expressing lymphomas are highly sensitive to the BCL-2 inhibitor venetoclax. We perform genome-wide activation screens in these lymphoma cells and find a dominant role for the BCL-2 protein A1 in venetoclax resistance. Here we show the potential of our CRISPRa model for mimicking disease and providing insights into resistance mechanisms towards targeted therapies.

| S-EPMC9374748 | biostudies-literature

NET-prism enables RNA polymerase-dedicated transcriptional interrogation at nucleotide resolution

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Maturation of human cardiac organoids enables complex disease modelling and drug discovery

Project description:Maturation of human cardiac organoids enables complex disease modelling and drug discovery

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IMPRINTS-CETSA Venetoclax in Kasumi-1 cells, 1h incubation

Project description:IMPRINTS-CETSA data acquisition of Kasumi-1 cells treated with Vehicle (DMSO), Venetoclax, Decitabine, Azacitidine and Azacitidine+Venetoclax using TMT 16 plex.

2024-10-23 | PXD056183 | Pride

IMPRINTS-CETSA Venetoclax in Kasumi-1 cells, 6h incubation

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Determinants of venetoclax resistance

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Determinants of venetoclax resistance

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Effect of venetoclax, tedizolid, and combination treatment on gene expression in a venetoclax-resistant AML cell line

Project description:The goal of this study was to profile the changes in gene expression in an AML cell line with acquired resistance to venetoclax in response to treatment with venetoclax, tedizolid, or combination of the 2 drugs.

2019-08-20 | GSE136032 | GEO

Targeting mitochondrial structure sensitizes AML to Venetoclax

Project description:The BCL-2 family plays important roles in acute myeloid leukemia (AML) and Venetoclax, a selective BCL-2 inhibitor, has received FDA approval for treatment of AML. However, drug resistance ensues after prolonged treatment, highlighting the need for a greater understanding of the underlying mechanisms. Using a genome-wide CRISPR/Cas9 screen in human AML, we identified genes whose inactivation sensitizes AML blasts to Venetoclax. Genes involved in mitochondrial organization and function were significantly depleted throughout our screen, including the mitochondrial chaperonin CLPB. We demonstrated that CLPB is upregulated in human AML, it is further induced upon acquisition of Venetoclax resistance and its ablation sensitizes AML cells to Venetoclax. Mechanistically, CLPB maintains the mitochondrial cristae structure via its interaction with the cristae-shaping protein OPA1, whereas its loss promotes apoptosis by inducing cristae remodeling and mitochondrial stress responses. Overall, our data suggest that targeting mitochondrial architecture may provide a promising approach to circumvent Venetoclax resistance.

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