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A functional genomics process for systematic dissection and mutation-specific target discovery in breast cancer PIK3CA hotspot mutations [RNA-seq]

ABSTRACT: Despite the general understanding that different mutations impart different phenotypic changes within a cell, the majority of targeted therapies in cancer treatment are used to treat all mutations in the same gene regardless of location or phenotypic effects. There is a significant unmet need to distinguish distinct changes in cellular signaling which may provide opportunities for mutation-specific treatment with reduced toxicity to patients. Herein, we describe a series of functional genomic analysis with a unique isogenic cell line panel to accurately identify targetable differences between mutations within the same gene. Using an isogenic cell line model bearing two distinct hotspot PIK3CA mutations found in breast cancer, we were able to identify many gene expression and chromatin accessibility differences. These findings allowed us to identify mutation specific molecular targets, specifically AREG as well as a proximal gene regulatory region, that may provide clinically relevant targets. When disrupted, these targets induce a mutation-specific decrease in proliferation and survival in vivo. These findings suggest new mutation-specific modes of treatment for PIK3CA mutant breast cancer and provide a means with which to find mutation-specific targets for the treatment of other oncogenic mutations.

ORGANISM(S): Homo sapiens

PROVIDER: GSE247819 | GEO | 2023/12/01

REPOSITORIES: GEO

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A functional genomics process for systematic dissection and mutation-specific target discovery in breast cancer PIK3CA hotspot mutations [ATAC-Seq]

Project description:Despite the general understanding that different mutations impart different phenotypic changes within a cell, the majority of targeted therapies in cancer treatment are used to treat all mutations in the same gene regardless of location or phenotypic effects. There is a significant unmet need to distinguish distinct changes in cellular signaling which may provide opportunities for mutation-specific treatment with reduced toxicity to patients. Herein, we describe a series of functional genomic analysis with a unique isogenic cell line panel to accurately identify targetable differences between mutations within the same gene. Using an isogenic cell line model bearing two distinct hotspot PIK3CA mutations found in breast cancer, we were able to identify many gene expression and chromatin accessibility differences. These findings allowed us to identify mutation specific molecular targets, specifically AREG as well as a proximal gene regulatory region, that may provide clinically relevant targets. When disrupted, these targets induce a mutation-specific decrease in proliferation and survival in vivo. These findings suggest new mutation-specific modes of treatment for PIK3CA mutant breast cancer and provide a means with which to find mutation-specific targets for the treatment of other oncogenic mutations.

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A functional genomics process for systematic dissection and mutation-specific target discovery in breast cancer PIK3CA hotspot mutations [CRISPR KO Screen Data]

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High-dose oncogenic PIK3CA drives constitutive cellular stemness through increased NODAL/TGFb signaling

Project description:Oncogenic PIK3CA mutations activate phosphoinositide 3-kinase (PI3K) and are among the commonest somatic mutations in cancer and mosaic, developmental overgrowth disorders. We recently demonstrated that the ‘hotspot’ variant PIK3CAH1047R exerts striking allele dose-dependent effects on stemness in human induced pluripotent stem cells (iPSCs), and moreover demonstrated multiple oncogenic PIK3CA copies in a substantial subset of human cancers. To identify the molecular mechanism underpinning PIK3CAH1047R allele dose-dependent stemness, we profiled isogenic wild-type, PIK3CAWT/H1047R and PIK3CAH1047R/H1047R iPSCs by high-depth transcriptomics, proteomics and reverse-phase protein arrays (RPPA). PIK3CAH1047R/H1047R iPSCs exhibited altered expression of 5644 genes and 248 proteins, whereas heterozygous hPSCs showed 492 and 54 differentially-expressed genes and proteins, respectively, confirming a nearly deterministic phenotypic effect of homozygosity for PIK3CAH1047R. Pathway and network-based analyses predicted a strong association between self-sustained TGFb/NODAL signaling and the ‘locked’ stemness phenotype induced by homozygosity for PIK3CAH1047R. This stemness gene signature was maintained without exogenous NODAL in PIK3CAH1047R/H1047R iPSCs and was reversed by pharmacological inhibition of TGFb/NODAL signaling but not by PIK3CA-specific inhibition. Analysis of PIK3CA-associated human breast cancers revealed increased expression of the stemness markers NODAL and POU5F1 as a function of disease stage and PIK3CAH1047R allele dosage. Together with emerging realization of the link between NODAL re-expression and aggressive cancer behavior, our data suggest that TGFb/NODAL inhibitors warrant testing in advanced breast tumors with multiple oncogenic PIK3CA copies.

2021-03-03 | PXD014719 | Pride

A functional genomics process for systematic dissection and mutation-specific target discovery in breast cancer PIK3CA hotspot mutations

Project description:A functional genomics process for systematic dissection and mutation-specific target discovery in breast cancer PIK3CA hotspot mutations

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Knock-in of PIK3CA-H1047R into MCF-10A

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2015-01-19 | E-GEOD-63452 | biostudies-arrayexpress

Developmental Venous Anomalies are a Genetic Primer for Cerebral Cavernous Malformations

Project description:Purpose: Cerebral cavernous malformations (CCMs) are hemorrhagic neurovascular malformations that may lead to stroke, seizures and other clinical sequelae. Recent studies have shown that somatic mutations in MAP3K3 and PIK3CA also contribute to CCM pathogenesis; however, it remains unclear how these mutations contribute to sporadic versus familial cases. In our previous research, we’ve shown that co-occurring MAP3K3 and PIK3CA mutations are present within the same clonal population of cells. The overall goal of this study was to identify PIK3CA mutations in CCM-associated developmental venous anomalies (DVA). We also analyzed the plasma miRNome of patients with (1) DVA without associated CCM, as well as (2) DVA with an associated CCM) to identify circulating miRNAs that might serve as biomarkers reflecting PIK3CA activity. Methods: We collected and sequenced the plasma miRNome of 12 individuals with a sporadic CCM associated with a DVA (CCM + DVA), 6 individuals with a DVA without a CCM (DVA only), and 7 healthy controls. Results: We found that the identical PIK3CA mutation is found in endothelial cells of both the DVA and its associated CCM, but that an activating MAP3K3 mutation appears only in the CCM. The analyses miR-134-5p was downregulated in the groups of patients with only a DVA only group (when compared to healthy controls). This miRNA has been shown to target PIK3CA. In addition, miR-182-5p, was upregulated and targets MAP3K3; while let-7c-5p was downregulated and targets both PIK3CA and MAP3K3 in the group of patients with CCM and an associated DVA (when compared to DVA only). Conclusions: These results support a mechanism where DVA develop as the result of a PIK3CA mutation, creating a region of the brain vasculature that functions as a genetic primer for CCM development following acquisition of an additional somatic mutation.

2022-02-06 | GSE195732 | GEO

A functional genomics process for systematic dissection and mutation-specific target discovery in breast cancer PIK3CA hotspot mutations [RNA-seq]

Project description:A functional genomics process for systematic dissection and mutation-specific target discovery in breast cancer PIK3CA hotspot mutations [RNA-seq]

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A functional genomics process for systematic dissection and mutation-specific target discovery in breast cancer PIK3CA hotspot mutations [ATAC-Seq]

Project description:A functional genomics process for systematic dissection and mutation-specific target discovery in breast cancer PIK3CA hotspot mutations [ATAC-Seq]

| PRJNA1040785 | ENA

Knock-in of PIK3CA-H1047R into MCF-10A

Project description:We have compared the proteome, transcriptome and metabolome of two isogenic cell lines: MCF-10A, derived from human breast epithelium, and the mutant MCF-10A-H1047R. These cell lines differ by a single amino acid substitution (H1047R) caused by single nucleotide change in one allele of the PIK3CA gene which encodes the catalytic subunit p110α of phosphatidylinositol 3-kinase (PI3K). The H1047R mutation of PIK3CA is one of the most frequently encountered somatic cancer-specific mutations. In MCF-10A, this mutation induces an extensive cellular reorganization that far exceeds the known signaling activities of PI3K. The changes are highly diverse; with examples in structural protein levels, the DNA repair machinery and sterol synthesis. Gene set enrichment analysis reveals a highly significant concordance of the genes differentially expressed in MCF-10A-H1047R cells and the established protein and RNA signatures of basal breast cancer. No such concordance was found with the specific gene signatures of other histological types of breast cancer. Our data document the power of a single base mutation, inducing an extensive remodeling of the cell toward the phenotype of a specific cancer.

2015-01-19 | GSE63452 | GEO

Targeting β-catenin overcomes resistance to MEK inhibitor in PIK3CA mutant colon cancer

Project description:Mitogen-activated protein kinases (MEK 1/2) are central components of the RAS signaling pathway and attractive targets for cancer therapy. However, PIK3CA mutation, which commonly co-occurs with KRAS mutation, offered resistance to MEK inhibitor through activation of PI3K-AKT signaling. We identified a gene that cooperates with MEK inhibitors to forcefully treat PIK3CA mutant colon cancer cells. -catenin, a key molecule of the WNT pathway, emerged as a candidate by protein/Ab Chip array. MEK inhibitor treatment led to a decrease in -catenin in PIK3CA wild-type colon cancer cells but not in PIK3CA mutant colon cancer cells. Tumor regression was promoted by a combination of MEK inhibitor and NVP-TNS656, which targets the WNT pathway. Furthermore, combined inhibition of MEK and -catenin by NVP-TNS656 promoted tumor regression in colon cancer patient-derived xenograft (PDX) models expressing mutant PIK3CA. Taken together, we propose that inhibition of the WNT pathway, particularly -catenin, may bypass resistance to MEK inhibitor in human PIK3CA mutant colon cancer. Additionally, -catenin is a potential PD marker of MEK inhibitor resistance. In the study, we identified and evaluated biomarker for response to MEK inhibitor on colon cancer cells.

2015-08-13 | E-GEOD-71981 | biostudies-arrayexpress

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