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Sleeping Beauty transposon mutagenesis identified genes involved in colorectal cancer development in the inflammatory microenvironment.

ABSTRACT: To identify genes and molecular pathways involved in colorectal cancer (CRC) that developed in an inflammatory microenvironment, we performed Sleeping Beauty (SB) transposon mutagenesis screening in Dextran Sodium Sulfate treated-mice. We have shown that cell cycle-related genes and TGFb pathway-related genes are frequently mutated in inflammation-related tumors. We have demonstrated that TNFa can promote dedifferentiation of colonic epithelial cells via epigenomic reprogramming, and activate both Cdkn2a-p53 signaling and CycD-Cdk4/6, creating advantageous conditions for selecting cells carrying mutations in the Cdkn2a-p53 pathway genes. We have also showed that Cdk4/6 inhibitors are effective against colorectal tumors in an inflammatory microenvironment using the SB mouse model, presenting a potential new therapeutic strategy. Thus, SB screening is not only powerful in identifying genes involved in cancers that develop in specific microenvironments, but also helpful in validating the efficacy of drugs.

ORGANISM(S): Mus musculus

PROVIDER: GSE221326 | GEO | 2023/08/31

REPOSITORIES: GEO

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Sleeping Beauty transposon mutagenesis identified genes involved in colorectal cancer development in the inflammatory microenvironment [wtvsTNF_KrasvsTNF]

Project description:To identify genes and molecular pathways involved in colorectal cancer (CRC) that developed in an inflammatory microenvironment, we performed Sleeping Beauty (SB) transposon mutagenesis screening in Dextran Sodium Sulfate treated-mice. We have shown that cell cycle-related genes and TGFb pathway-related genes are frequently mutated in inflammation-related tumors. We have demonstrated that TNFa can promote dedifferentiation of colonic epithelial cells via epigenomic reprogramming, and activate both Cdkn2a-p53 signaling and CycD-Cdk4/6, creating advantageous conditions for selecting cells carrying mutations in the Cdkn2a-p53 pathway genes. We have also showed that Cdk4/6 inhibitors are effective against colorectal tumors in an inflammatory microenvironment using the SB mouse model, presenting a potential new therapeutic strategy. Thus, SB screening is not only powerful in identifying genes involved in cancers that develop in specific microenvironments, but also helpful in validating the efficacy of drugs.

2023-08-31 | GSE217169 | GEO

Sleeping Beauty transposon mutagenesis identified genes involved in colorectal cancer development in the inflammatory microenvironment [DSS]

2023-08-31 | GSE217168 | GEO

Sleeping Beauty Expression data from mouse

Project description:We extracted RNA of 39 mouse tissue of various genotypes and performed expression microarrays. Subsequently a screen was conducted using the Sleeping Beauty (SB) transposon to identify breast cancer candidate genes.

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Sleeping Beauty transposon mutagenesis in mouse intestinal organoids identifies genes involved in tumor progression and metastasis [Atxn1]

Project description:To identify genes important for colorectal cancer (CRC) development and metastasis, we established a new metastatic mouse organoid model using Sleeping Beauty (SB) transposon mutagenesis. Intestinal organoids derived from mice carrying actively mobilizing SB transposons, an activating KrasG12D, and an inactivating ApcΔ716 allele, were transplanted to immunodeficient mice. Analysis of SB insertion sites in tumors identified numerous candidate cancer genes (CCGs) identified previously in intestinal SB screens performed in vivo, in addition to new CCGs, such as Atxn1. To provide functional validation, we knocked out Atxn1 in mouse tumor organoids carrying an activating KrasG12D, and an inactivating ApcΔ716 allele, and transplanted to mice. Tumor development was promoted when these gene were knocked out, demonstrating that these are potent tumor suppressors.

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Sleeping Beauty Expression data from mouse

2016-07-03 | E-GEOD-43263 | biostudies-arrayexpress

A Sleeping Beauty Forward Genetic Screen Identifies Genes Promoting Osteosarcoma Development and Metastasis

Project description:A Sleeping Beauty (SB) transposon forward genetic screen was performed to identify the genes that promote osteosarcoma (OS) development and metastasis. Mutagenesis induced OS in wild type mice and accelerated it on a Trp53 deficient background. Analysis of tumors demonstrated that Trp53 deficiency is correlated with genomic instability, which was virtually absent in tumors induced by SB mutagenesis alone. Metastases developed in a subset of animals and in nearly all cases were clonal related to primary tumors. Over 200 candidate genes were identified, many of which are altered in human cancers including OS. Signaling pathways enriched for candidate genes were also identified and a subset of these pathways and genes were functionally validated and represent new targets for OS treatment.

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A Sleeping Beauty Forward Genetic Screen Identifies Genes Promoting Osteosarcoma Development and Metastasis

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FIRST PHASE I TRIALS OF SLEEPING BEAUTY-MODIFIED CD19-SPECIFIC T CELLS

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2016-06-08 | GSE83076 | GEO

Identification of genes involved in SHH subgroup medulloblastoma using murine whole-body Sleeping Beauty insertional mutagenesis

Project description:Ptch+/- mice, which are predisposed to SHH subgroup medulloblastoma, were mutagenised using the Sleeping Beauty transposon to identify genes which increase the frequency of medulloblastoma formation. Gene expression in tumours was assessed both to investigate their relationship to human subgroup tumours, and to identify genes where expression was altered by mutagenesis. Total RNA isolated from tumours induced by SB mutagenesis were compared to normal cerebellum, tumours induced witout SB mutagenesis, and tumours from a distinct model of disease (GTML).

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Sleeping beauty transposition from nonintegrating lentivirus.

Project description:Lentiviral vectors enter cells with high efficiency and deliver stable transduction through integration into host chromosomes, but their preference for integration within actively transcribing genes means that insertional mutagenesis following disruption of host proto-oncogenes is a recognized concern. We have addressed this problem by combining the efficient cell and nuclear entry properties of HIV-1-derived lentiviral vectors with the integration profile benefits of Sleeping Beauty (SB) transposase. Importantly, this integration enzyme does not exhibit a preference for integration within active genes. We generated integrase-deficient lentiviral vectors (IDLVs) to carry SB transposon and transposase expression cassettes. IDLVs were able to deliver transient transposase expression to target cells, and episomal lentiviral DNA was found to be a suitable substrate for integration via the SB pathway. The hybrid vector system allows genomic integration of a minimal promoter-transgene cassette flanked by short SB inverted repeats (IRs) but devoid of HIV-1 long terminal repeats (LTRs) or other virus-derived sequences. Importantly, integration site analysis revealed redirection toward a profile mimicking SB-plasmid integration and away from integration within transcriptionally active genes favored by integrase-proficient lentiviral vectors (ILVs).

| S-EPMC2835211 | biostudies-literature

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