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Homo sapiens

ABSTRACT: Discovery of naturally occurring ESR1 mutations during acquisition of resistance to endocrine therapy in widely used estrogen receptor positive breast cancer cell lines [ChIP-Seq]

OTHER RELATED OMICS DATASETS IN: PXD004807GSE100076

PROVIDER: PRJNA390635 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR5687490_1.fastq.gz	Fastqsanger.gz
	SRR5687490_2.fastq.gz	Fastqsanger.gz
	SRR5687491.fastq.gz	Fastqsanger.gz
	SRR5687492_1.fastq.gz	Fastqsanger.gz
	SRR5687492_2.fastq.gz	Fastqsanger.gz

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Discovery of naturally occurring ESR1 mutations during acquisition of resistance to endocrine therapy in widely used estrogen receptor positive breast cancer cell lines

Project description:Discovery of naturally occurring ESR1 mutations during acquisition of resistance to endocrine therapy in widely used estrogen receptor positive breast cancer cell lines

| PRJNA390631 | ENA

Discovery of naturally occurring ESR1 mutations during acquisition of resistance to endocrine therapy in widely used estrogen receptor positive breast cancer cell lines [RNA-Seq]

Project description:We report the first discovery of naturally occurring ESR1Y537C and ESR1Y537S mutations in MCF7 and SUM44 ESR1-positive cell-lines after acquisition of resistance to long-term-estrogen-deprivation (LTED) and subsequent resistance to fulvestrant (ICIR).

2018-01-12 | GSE100075 | GEO

Discovery of naturally occurring ESR1 mutations during acquisition of resistance to endocrine therapy in widely used estrogen receptor positive breast cancer cell lines [ChIP-Seq]

Project description:We report the first discovery of naturally occurring ESR1Y537C and ESR1Y537S mutations in MCF7 and MCF7 ESR1-positive cell-lines after acquisition of resistance to long-term-estrogen-deprivation (LTED) and subsequent resistance to fulvestrant (ICIR).

2018-01-12 | GSE100074 | GEO

Project description:Discovery of naturally occurring ESR1 mutations in widely used estrogen receptor positive breast cancer cell lines

| PRJNA390496 | ENA

Homo sapiens

Project description:Discovery of naturally occurring ESR1 mutations during acquisition of resistance to endocrine therapy in widely used estrogen receptor positive breast cancer cell lines [RNA-Seq]

| PRJNA390636 | ENA

DNA methylation of estrogen regulated enhancers defines endocrine sensitivity in breast cancer

Project description:Expression of estrogen receptor (ESR1) determines whether a breast cancer patient receives endocrine therapy as part of their adjuvant care, but does not guarantee patient response. However, the molecular factors that define endocrine response in ESR1-positive breast cancer patients remain poorly understood. Here, we characterize the DNA methylome of endocrine sensitivity and demonstrate the potential impact of differential DNA methylation on endocrine response in breast cancer. We show that DNA hypermethylation occurs predominantly at estrogen-responsive enhancers and is associated with reduced ESR1 binding and decreased gene expression of key regulators of ESR1-activity; thus providing a novel mechanism by which endocrine response is abated in ESR1-positive breast cancers. Conversely, we delineate that ESR1-responsive enhancer hypomethylation is critical in transition from normal mammary epithelial cells to endocrine responsive ESR1-positive cancer. Cumulatively these novel insights highlight the potential of ESR1-responsive enhancer methylation to both predict ESR1-positive disease and stratify ESR1-positive breast cancer patients as responders to endocrine therapy. Methylation profiling with Illumina's HumanMethylation450K array was performed on ESR1-positive hormone sensitive MCF7 cells, and three different well characterised endocrine resistant MCF7-derived cell lines; tamoxifen-resistant (TAMR), fulvestrant-resistant (FASR) and estrogen deprivation resistant (MCF7X) cells. For each cell line two biological replicates were profiled bringing the number of samples to eight.

2015-07-01 | E-GEOD-69118 | biostudies-arrayexpress

DNA methylation of estrogen regulated enhancers defines endocrine sensitivity in breast cancer

2015-07-01 | GSE69118 | GEO

Transcriptional properties of estrogen receptor fusion genes.

Project description:RNA sequencing (RNA-seq) detects estrogen receptor alpha gene (ESR1) fusion transcripts in estrogen receptor positive (ER+) breast cancer but their role in disease pathogenesis remains unclear. Herein we examined multiple in-frame and out-of-frame ESR1 fusions and found that two, both identified in advanced endocrine treatment resistant disease, encoded stable and functional in-frame fusion proteins. In both examples, ESR1-e6>YAP1 and ESR1-e6>PCDH11X, the N-terminal, DNA binding and dimerization motifs encoded by exons 2-6 were fused to C terminal sequences from the partner gene. Functional properties included estrogen-independent growth, constitutive expression of ER target genes, anti-estrogen resistance, induction of cellular motility in vitro and the development of lung metastasis in vivo. Chromatin immunoprecipitation and RNA sequencing experiments showed both fusions uniquely activated a metastasis-associated transcriptional program. ESR1-e6>YAP1 and ESR1-e6>PCDH11X-induced growth remained sensitive to a CDK4/6 inhibitor, palbociclib, and a patient-derived xenograft (PDX) naturally expressing the ESR1-e6>YAP1 fusion was also responsive. Transcriptionally active ESR1 fusions therefore trigger both endocrine therapy resistance and metastatic progression explaining the association with fatal disease progression, although CDK4/6 inhibitor treatment is predicted to be effective.

2018-07-11 | GSE116170 | GEO

Targeting kinome reprogramming in ESR1 fusion-driven metastatic breast cancer

Project description:Transcriptionally active ESR1 fusions promote endocrine therapy (ET)-resistant growth and metastasis of estrogen receptor-alpha positive (ERα+) breast cancer. Currently, there are no targeted treatment options for tumors harboring active fusions because the ESR1 ligand binding domain (LBD) has been replaced with non-drug binding sequences from the 3’ partner gene. A mass spectrometry (MS)-based Kinase Inhibitor Pulldown Assay (KIPA) demonstrated an increase of multiple receptor tyrosine kinases including RET in T47D cells expressing active ESR1 fusions. Integrated proteogenomics defined tumor subsets that could be responsive to RET and CDK4/6 directed therapy from 22 biologically heterogeneous ERα+ patient-derived xenograft (PDX) tumors. Inhibition of RET by repurposing an FDA-approved drug significantly suppressed ESR1 fusion-driven growth of cell, PDX-derived organoid (PDXO) and PDX models. CDK4/6 inhibitor treatment showed similar tumor reductions to RET inhibition. Here, we reveal therapeutic kinase vulnerabilities in ESR1 fusion-driven tumors, which will lay the framework for future clinical trials.

2023-10-24 | PXD033339 | Pride

RNA sequencing of endocrine resistant breast cancer

Project description:*** This submission includes RNA data, with DNA files available under a different accession number*** Purpose: Endocrine therapy resistance remains the greatest challenge for treating hormone receptor positive breast cancer patients. We aim to identify molecular mechanisms underlying endocrine therapy resistance through in-depth genomic analysis of patient samples. Experimental Design: We collected tumors from 35 estrogen receptor positive breast cancer patients receiving endocrine therapy, of which 3 patients had intrinsic resistance and 19 patients developed acquired resistance. For each patient, multiple tumor specimens were collected during the course of treatment. We performed DNA whole exome sequencing and RNA sequencing on all tumor samples. DNA mutations, copy number alterations and RNA gene expression data were analyzed through supervised analyses comparing paired sensitive and resistant tumor samples to identify molecular features related to endocrine therapy resistance. Results: We identified mutations enriched in resistant tumors including ESR1 and GATA3. ESR1 D538G variant confers endocrine therapy resistance while E380Q variant confers hypersensitivity. We demonstrate that resistant tumors had distinct gene expression profiles and elevated signaling pathways including ER, HER2, GATA3, AKT, RAS and p63 signaling. Integrated analysis for individual patient highlighted the heterogeneity of endocrine therapy resistance mechanisms. Conclusions: Our results suggest that mechanisms underlying endocrine therapy resistance are highly heterogeneous with diverse changes in genomic and transcriptomic levels.

2022-09-01 | E-MTAB-9917 | biostudies-arrayexpress

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