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Role of HNF4a in osteoblasts [ChIP-seq]

ABSTRACT: Role of HNF4a in osteoblasts [ChIP-seq]

PROVIDER: PRJNA786625 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR17147600.fastq.gz	Fastqsanger.gz
	SRR17147601.fastq.gz	Fastqsanger.gz
	SRR17147602.fastq.gz	Fastqsanger.gz
	SRR17147603.fastq.gz	Fastqsanger.gz
	SRR17147604.fastq.gz	Fastqsanger.gz

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Project description:Estrogen Receptor alpha (ERα) is a key driver of most breast cancers, and it is the target of endocrine therapies used in the clinic to treat women with ERα positive (ER+) breast cancer. The two methods ChIP-seq (chromatin immunoprecipitation coupled with deep sequencing) and RIME (Rapid Immunoprecipitation of Endogenous Proteins) have greatly improved our understanding of ERα function during breast cancer progression and in response to anti-estrogens. A critical component of both ChIP-seq and RIME protocols is the antibody that is used to pull down the bait protein. To date, most of the ChIP-seq and RIME experiments for the study of ERα have been performed using the sc-543 antibody from Santa Cruz Biotechnology. However, this antibody has been discontinued, thereby severely impacting the study of ERα in normal physiology as well as diseases such as breast cancer and ovarian cancer. Here, we compare the sc-543 antibody with other commercially available antibodies, and we show that 06-935 (EMD Millipore) and ab3575 (Abcam) antibodies can successfully replace the sc-543 antibody for ChIP-seq and RIME experiments.

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Role of HNF4a in osteoblasts [ChIP-seq]

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Project description:In each cell type the expression of genes is regulated by the action of a large number of transcription factors, but so far we have only a rudimentary knowledge of the location of the gene regulatory elements where they bind. This can now be addressed with genome-wide ChIP experiments. In a previous ChIP-chip study of USF1 and USF2 we found evidence also of binding of GABP, FOXA2 and HNF4a within the enriched regions. Here we have applied ChIP-seq for these transcription factors and identified 3064 peaks of enrichment for GABP, 7266 for FOXA2 and 18783 for HNF4a. HNF4a and FOXA2 binding was found in at least half of the regions previously identified as bound by USF2 but not USF1, showing that they frequently bind the same regulatory elements. GABP peaks were found at transcription start sites whereas 94 % of FOXA2 and 90 % of HNF4a peaks were located at other positions. We developed a method based on the high resolution achieved by ChIP-seq to accurately define TFBS within peaks, and found the predicted sites to have an elevated conservation level compared to peak centers; however the majority of bindings were not evolutionary conserved. An unexpected interaction between HNF4a and GABP was seen at TSS, with as many as 1/3 of the HNF4a positive promoters being bound also by GABP, and co-immunoprecipitations show that these factors are in the same complex in the nucleus. ArrayExpress Release Date: 2009-06-10 Publication Title: Molecular interactions between HNF4a, FOXA2 and GABP identified at regulatory DNA elements through ChIP-sequencing Publication Author List: Ola Wallerman, Mehdi Motallebipour, Stefan Enroth, Kalicharan Patra, MadhuSudan Reddy Bysani, Jan Komorowski, Claes Wadelius Person Roles: submitter Person Last Name: Wallerman Person First Name: Ola Person Mid Initials: Person Email: ola.wallerman@genpat.uu.se Person Phone: Person Address: IGP, Rudbecklab Person Affiliation: Uppsala University

2011-02-05 | GSE25694 | GEO

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