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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Development of gene expression signatures for knockdown of synthetic lethal gene

ABSTRACT: We performed genome-wide expression profiling analysis to define the genes underlying the synthetic-lethal relationship between CBP and p300. We extracted 1,936 genes whose expression levels changed >2-fold upon p300-knockdown (KD) in CBP-KO cells, or upon CBP-KD in p300-KO cells, but not in either KD in wild-type cells Gene expression profile in human lung H1299, H1299 CBP KO, H1299 p300KO cells was measured at 48 hours after transfection of siNT, siCBP or sip300. Two independent experiments were performed at each time (48 hours).

ORGANISM(S): Homo sapiens

SUBMITTER: Takashi Kohno

PROVIDER: E-GEOD-73682 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Targeting p300 Addiction in CBP-Deficient Cancers Causes Synthetic Lethality by Apoptotic Cell Death due to Abrogation of MYC Expression.

Ogiwara Hideaki H Sasaki Mariko M Mitachi Takafumi T Oike Takahiro T Higuchi Saito S Tominaga Yuichi Y Kohno Takashi T

Cancer discovery 20151124 4

<h4>Unlabelled</h4>Loss-of-function mutations in the CBP/CREBBP gene, which encodes a histone acetyltransferase (HAT), are present in a variety of human tumors, including lung, bladder, gastric, and hematopoietic cancers. Consequently, development of a molecular targeting method capable of specifically killing CBP-deficient cancer cells would greatly improve cancer therapy. Functional screening of synthetic-lethal genes in CBP-deficient cancers identified the CBP paralog p300/EP300 Ablation of p ...[more]

PMID: 26603525

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Definition of aberrant MYB CBP/P300 complex in AML

Project description:Dysregulated gene expression is one of the most prevalent features in human cancers. Here, we show that most subtypes of acute myeloid leukemia (AML) depend on the aberrant assembly of the MYB transcriptional co-activator complex. By rapid and selective peptidomimetic interference with the binding of CBP/P300 to MYB, but not CREB or MLL1, we find that the leukemic functions of MYB are mediated by CBP/P300-mediated co-activation of a distinct set of transcriptional factor complexes that are aberrantly assembled with MYB in AML cells. This therapeutic remodeling is accompanied by dynamic redistribution of CBP/P300 complexes to genes that control cellular differentiation and growth. Thus, aberrantly organized transcription factor complexes control convergent gene expression programs in AML cells. These findings establish a compelling strategy for pharmacologic reprogramming of oncogenic gene expression that supports its targeting for leukemias and other human cancers caused by dysregulated gene control.

2020-12-17 | PXD019708 | Pride

Khib proteome in response to p300 KO

Project description:We used quantitative proteomics to characterize the p300-regulated lysine 2-hydroxyisobutyrylome in wild type (WT) and p300 knockout (KO) cells.

2018-07-11 | PXD008525 | Pride

Expression data from wild type and CBP/p300 null MEFs +/- 3hr treatment with 100uM dipyridyl (DP)

Project description:Genome-wide distribution of histone H3K18 and H3K27 acetyltransferases, Crebbp (CBP) and Ep300 (p300), is used to map enhancers and promoters, but whether these elements functionally require CBP/p300 remains largely uncertain. We investigated this relationship by comparing genomic CBP recruitment with gene expression in wild type and CBP/p300 double-knockout fibroblasts. ChIP-seq revealed nearby CBP recruitment for 20 percent of constitutively expressed genes, but surprisingly, three-quarters of these were unaffected or slightly activated by CBP/p300 deletion. Computationally defined enhancer-promoter-units (EPUs) having a CBP peak within two kilobases of the enhancer-like element provided better predictive value, with CBP/p300 deletion attenuating expression of 40 percent of such EPU assigned constitutively expressed genes. We next examined signaling-responsive (Hypoxia Inducible Factor) gene expression and CBP recruitment, and found that 97 percent of inducible genes were within 50 kilobases of an inducible CBP peak, and 70 percent of these required CBP/p300 for full inducible expression. Unexpectedly however, most inducible CBP peaks occurred near signal-nonresponsive genes. 12 samples, 3 each wild type and CBP/p300 null treated for 3hrs with 100uM dipyridyl orethanol vehicle.

2014-09-29 | E-GEOD-54452 | biostudies-arrayexpress

Development of gene expression signatures for knockdown of synthetic lethal gene

Project description:We performed genome-wide expression profiling analysis to define the genes underlying the synthetic-lethal relationship between CBP and p300. We extracted 1,936 genes whose expression levels changed >2-fold upon p300-knockdown (KD) in CBP-KO cells, or upon CBP-KD in p300-KO cells, but not in either KD in wild-type cells

2015-12-12 | GSE73682 | GEO

Epigenetic mechanisms to propagate histone acetylation by p300/CBP

Project description:Histone acetylation is important for the activation of gene transcription but little is known about its direct ‘read/write’ mechanisms. Here, we report cryo-electron microscopy structures in which a p300/CBP multidomain monomer recognizes histone H4 N-terminal tail (NT) acetylation (ac) in a nucleosome and acetylates non-H4 histone NTs within the same nucleosome. p300/CBP not only recognized H4NTac via the bromodomain pocket responsible for ‘reading’, but also interacted with the DNA minor grooves via the outside of that pocket. This directed the catalytic center of p300/CBP to one of the non-H4 histone NTs. The primary target that p300 ‘writes’ by ‘reading’ H4NTac was H2BNT, and H2BNTac promoted H2A-H2B dissociation from the nucleosome. We propose a model in which p300/CBP ‘replicates’ histone NT acetylation within the H3-H4 tetramer to inherit epigenetic storage, and ‘transcribes’ it from the H3-H4 tetramer to the H2B-H2A dimers to activate context-dependent gene transcription through local nucleosome destabilization.

2023-05-08 | PXD040835 | Pride

CREBBP (CBP) ChIP-seq in wild type and CBP null MEFs +/- dipyridyl

Project description:Genome-wide distribution of histone H3K18 and H3K27 acetyltransferases, Crebbp (CBP) and Ep300 (p300), is used to map enhancers and promoters, but whether these elements functionally require CBP/p300 remains largely uncertain. We investigated this relationship by comparing genomic CBP recruitment with gene expression in wild type and CBP/p300 double-knockout fibroblasts. ChIP-seq revealed nearby CBP recruitment for 20 percent of constitutively expressed genes, but surprisingly, three-quarters of these were unaffected or slightly activated by CBP/p300 deletion. Computationally defined enhancer-promoter-units (EPUs) having a CBP peak within two kilobases of the enhancer-like element provided better predictive value, with CBP/p300 deletion attenuating expression of 40 percent of such EPU assigned constitutively expressed genes. We next examined signaling-responsive (Hypoxia Inducible Factor) gene expression and CBP recruitment, and found that 97 percent of inducible genes were within 50 kilobases of an inducible CBP peak, and 70 percent of these required CBP/p300 for full inducible expression. Unexpectedly however, most inducible CBP peaks occurred near signal-nonresponsive genes. eight samples total; Two wild type and two CBP null primary mouse embryonic fibroblast (MEF) lines, each treated with 100uM 2,2-dipyridyl or ethanol vehicle for 2 hours

2014-09-29 | E-GEOD-54453 | biostudies-arrayexpress

Kcr proteome in response to p300 KO

Project description:We used quantitative proteomics to characterize the p300-regulated lysine crotonylome in wild type (WT) and p300 knockout (KO) cells.

2018-06-26 | PXD006407 | Pride

Transcription profiling of mouse hippocampus from wild type and p300+/- mice to study Rubinstein-Taybi syndrome (RSTS)

Project description:Rubinstein-Taybi syndrome (RSTS) is a complex autosomal-dominant disease characterized by mental and growth retardation and skeletal abnormalities. A majority of the individuals diagnosed with RSTS carry heterozygous mutation in the gene CREBBP, but a small percentage of cases are caused by mutations in EP300. To investigate the contribution of p300 to RSTS pathoetiology, we carried out a comprehensive and multidisciplinary characterization of p300+/- mice. These mice exhibited facial abnormalities and impaired growth, two traits associated to RSTS in humans. We also observed abnormal gait, reduced swimming speed, enhanced anxiety in the elevated plus maze, and mild cognitive impairment during the transfer task in the water maze. These analyses demonstratethat p300+/- mice exhibit phenotypes that are reminiscent of neurological traits observed in RSTS patients, but their comparison with previous studies on CBP deficient strains also indicate that, in agreement with the most recent findings in human patients, the activity of p300 in cognition is likely less relevant or more susceptible to compensation than the activity of CBP. To identify those genes whose expression was altered in the hippocampus of p300 deficient mutants, we performed a gene profiling analysis of hippocampal tissue using high-density oligonucleotide microarrays. Experiment Overall Design: We obtained triplicate samples containing total RNA from the hippocampi of four 3-month old females of either genotype (in total 12 p300+/- mice and 12 wild type littermates were used in the experiment).

2009-10-10 | E-GEOD-18383 | biostudies-arrayexpress

p300 and CBP are essential for skeletal muscle homeostasis, contractile function and survival

Project description:Reversible epsilon-amino acetylation of lysine residues regulates transcription as well as metabolic flux; however, roles for specific lysine acetyltransferases in skeletal muscle physiology and function remain enigmatic. In this study, we investigated the role of the homologous acetyltransferases p300 and CBP in skeletal muscle transcriptional homeostasis and physiology in adult mice. Mice with skeletal muscle-specific and inducible knockout of p300 and/or CBP were generated by crossing mice with a tamoxifen-inducible Cre recombinase expressed under the human alpha-skeletal actin (HSA) promoter with mice harboring LoxP sites flanking exon 9 of both the Ep300 and Crebbp genes. Knockout was induced at 13-15 weeks of age via oral gavage of tamoxifen. We demonstrate that loss of both p300 and CBP in adult mouse skeletal muscle severely impairs contractile function and results in lethality within one week – a phenotype that is reversed by the presence of a single allele of either p300 or CBP. The loss of muscle function in p300/CBP double knockout mice is paralleled by substantial transcriptional alterations in gene networks central to skeletal muscle contraction and structural integrity. Changes in protein expression patterns, determined by 10-plex TMT labeling, were linked to impaired muscle function also manifest within days (WT mice were compared to day 3 and day 5 knock out mice). Together, these data reveal the requirement of p300 and CBP for the control and maintenance of contractile function and transcriptional homeostasis in skeletal muscle, and ultimately, organism survival. By extension, modulating p300/CBP function holds promise for the treatment of disorders characterized by impaired contractile function in humans.

2020-04-03 | PXD015694 | Pride

NCI-H1299 cell line transfected with human DENND2D and vector

Project description:Gene expression for NCI-H1299 cell line transfected with human DENND2D and vector (pcDNA3.1/V5-His TOPO TA vector) respectively. The microarray experiment was designed to perform four replicates for each H1299-DENND2D and H1299-vector sample. cRNA used in replication 1 and 2 was from the same label reaction to perform the hybridization replicates.

2010-05-27 | E-GEOD-16890 | biostudies-arrayexpress

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