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DNA Methyltransferase inhibition reverses epigenetically embedded phenotypes in lung cancer preferentially affecting Polycomb target genes

ABSTRACT: DNA Methyltransferase inhibition reverses epigenetically embedded phenotypes in lung cancer preferentially affecting Polycomb target genes

OTHER RELATED OMICS DATASETS IN: E-GEOD-52143

PROVIDER: PRJNA189722 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1035540.fastq.gz	Fastqsanger.gz
	SRR1035550.fastq.gz	Fastqsanger.gz
	SRR1035541.fastq.gz	Fastqsanger.gz
	SRR1035551.fastq.gz	Fastqsanger.gz
	SRR1035542.fastq.gz	Fastqsanger.gz

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DNA Methyltransferase inhibition reverses epigenetically embedded phenotypes in lung cancer preferentially affecting Polycomb target genes

Project description:Cancer cell phenotypes are partially determined by epigenetic specifications such as DNA methylation. Metastasis development is a late event in cancerogenesis and might be associated with epigenetic alterations. Here, we analyzed genome wide DNA methylation changes that were associated with pro-metastatic phenotypes in non-small cell lung cancer with Reduced Representation Bisulfite Sequencing. DNMT-inhibition by 5-Azacytidine at low concentrations reverted the pro-metastatic phenotype. 5-Azacytidine led to preferential loss of DNA methylation at sites that were DNA hypermethylated during the in vivo selection. Changes in DNA methylation persisted over time. Refer to individual Series

2013-12-18 | E-GEOD-44390 | biostudies-arrayexpress

DNA Methyltransferase inhibition reverses epigenetically embedded phenotypes in lung cancer preferentially affecting Polycomb target genes

2013-12-18 | GSE44390 | GEO

G-CSF SECRETED BY EPIGENETICALLY REPROGRAMMED MUTANT IDH1 GLIOMA STEM CELLS, REVERSES THE MYELOID CELLS'-MEDIATED IMMUNOSUPPRESSIVE TUMOR MICROENVIRONMENT

Project description:G-CSF SECRETED BY EPIGENETICALLY REPROGRAMMED MUTANT IDH1 GLIOMA STEM CELLS, REVERSES THE MYELOID CELLS'-MEDIATED IMMUNOSUPPRESSIVE TUMOR MICROENVIRONMENT

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G-CSF SECRETED BY EPIGENETICALLY REPROGRAMMED MUTANT IDH1 GLIOMA STEM CELLS, REVERSES THE MYELOID CELLS'-MEDIATED IMMUNOSUPPRESSIVE TUMOR MICROENVIRONMENT [Run1736]

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G-CSF SECRETED BY EPIGENETICALLY REPROGRAMMED MUTANT IDH1 GLIOMA STEM CELLS, REVERSES THE MYELOID CELLS'-MEDIATED IMMUNOSUPPRESSIVE TUMOR MICROENVIRONMENT [Run2961]

Project description:G-CSF SECRETED BY EPIGENETICALLY REPROGRAMMED MUTANT IDH1 GLIOMA STEM CELLS, REVERSES THE MYELOID CELLS'-MEDIATED IMMUNOSUPPRESSIVE TUMOR MICROENVIRONMENT [Run2961]

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G-CSF SECRETED BY EPIGENETICALLY REPROGRAMMED MUTANT IDH1 GLIOMA STEM CELLS, REVERSES THE MYELOID CELLS'-MEDIATED IMMUNOSUPPRESSIVE TUMOR MICROENVIRONMENT [human]

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BID preferentially activates BAK while BIM preferentially activates BAX, affecting chemotherapy response.

Project description:Apoptosis is a highly regulated form of cell death that controls normal homeostasis as well as the antitumor activity of many chemotherapeutic agents. Commitment to death via the mitochondrial apoptotic pathway requires activation of the mitochondrial pore-forming proteins BAK or BAX. Activation can be effected by the activator BH3-only proteins BID or BIM, which have been considered to be functionally redundant in this role. Herein, we show that significant activation preferences exist between these proteins: BID preferentially activates BAK while BIM preferentially activates BAX. Furthermore, we find that cells lacking BAK are relatively resistant to agents that require BID activation for maximal induction of apoptosis, including topoisomerase inhibitors and TRAIL. Consequently, patients with tumors that harbor a loss of BAK1 exhibit an inferior response to topoisomerase inhibitor treatment in the clinic. Therefore, BID and BIM have nonoverlapping roles in the induction of apoptosis via BAK and BAX, affecting chemotherapy response.

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Retrotransposon addiction promotes centromere function via epigenetically activated small RNAs

Project description:Retrotransposons have invaded eukaryotic centromeres in cycles of repeat expansion and purging, but the function of centromeric retrotransposons, if any, has remained unclear. In Arabidopsis, centromeric ATHILA retrotransposons give rise to epigenetically activated short interfering RNAs (easiRNAs) in mutants in DECREASE IN DNA METHYLATION1 (DDM1), which promote histone H3 lysine-9 di-methylation (H3K9me2). Here, we show that mutants which lose both DDM1 and RNA dependent RNA polymerase (RdRP) have pleiotropic developmental defects and mis-segregation of chromosome 5 during mitosis. Fertility defects are epigenetically inherited with the centromeric region of chromosome 5, and can be rescued by directing artificial small RNAs to a single family of ATHILA5 retrotransposons specifically embedded within this centromeric region. easiRNAs and H3K9me2 promote pericentromeric condensation, chromosome cohesion and proper chromosome segregation in mitosis. Insertion of ATHILA silences transcription, while simultaneously making centromere function dependent on retrotransposon small RNAs, promoting the selfish survival and spread of centromeric retrotransposons. Parallels are made with the fission yeast S. pombe, where chromosome segregation depends on RNAi, and with humans, where chromosome segregation depends on both RNAi and HELLSDDM1.

2022-10-24 | GSE132005 | GEO

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