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ECLIP in immortalized human mammary epithelial cells

ABSTRACT: The epithelial-to-mesenchymal transition (EMT) contributes to tumor heterogeneity and has been implicated in tumor initiation and metastasis. To systematically identify genes involved in EMT, we performed a genome-scale expression screen in human mammary epithelial cells and found a striking enrichment in RNA splicing factors. In particular, the RNA-binding proteins QKI and RBFOX1 were necessary and sufficient to promote EMT and stem-like states. Among the transcripts cooperatively regulated by both factors, we found that alternative splicing of the actin-binding protein FLNB plays an essential role in the regulation of EMT. The skipping of FLNB exon 30 and the elevated expression of QKI were strongly associated with EMT gene signatures in both basal B subtype breast cancer cell lines and basal-like breast cancer patient samples. These observations demonstrate that alternative splicing regulated by QKI and RBFOX1 plays an active role in promoting EMT in basal-like breast cancers.

ORGANISM(S): Homo sapiens

PROVIDER: GSE98209 | GEO | 2018/04/25

REPOSITORIES: GEO

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RNA-sequencing in immortalized human mammary epithelial cells

Project description:The epithelial-to-mesenchymal transition (EMT) contributes to tumor heterogeneity and has been implicated in tumor initiation and metastasis. To systematically identify genes involved in EMT, we performed a genome-scale expression screen in human mammary epithelial cells and found a striking enrichment in RNA splicing factors. In particular, the RNA-binding proteins QKI and RBFOX1 were necessary and sufficient to promote EMT and stem-like states. Among the transcripts cooperatively regulated by both factors, we found that alternative splicing of the actin-binding protein FLNB plays an essential role in the regulation of EMT. The skipping of FLNB exon 30 and the elevated expression of QKI were strongly associated with EMT gene signatures in both basal B subtype breast cancer cell lines and basal-like breast cancer patient samples. These observations demonstrate that alternative splicing regulated by QKI and RBFOX1 plays an active role in promoting EMT in basal-like breast cancers.

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Transcriptome-wide HITS-CLIP of Quaking (QKI) in TGF-Beta-treated HMLE (Mesenchymal-like) cells

Project description:Members of the miR-200 family are critical gatekeepers of the epithelial state, restraining expression of pro-mesenchymal genes that drive epithelial-mesenchymal transition (EMT) and contribute to metastatic cancer progression. Here, we show that miR-200c and another epithelial-enriched miRNA, miR-375, exert widespread control of alternative splicing in cancer cells. This is achieved by their strong suppression of the RNA binding protein Quaking (QKI), which is required to mediate the splicing changes regulated by these miRNAs. During EMT, QKI-5 directly binds to and regulates hundreds of alternative splicing events and exerts pleiotropic effects, such as increasing cell migration and invasion and restraining tumour growth, without appreciably affecting mRNA levels. QKI-5 is both necessary and sufficient to direct EMT alternative splicing changes, and this splicing signature is broadly conserved across many epithelial-derived cancer types. Importantly, several actin cytoskeleton-associated genes are directly targeted both by QKI and miR-200c, revealing coordinated control of alternative splicing and mRNA abundance during EMT. These findings demonstrate the existence of a miR-200/miR-375/QKI axis that impacts cancer-associated epithelial cell plasticity through widespread control of alternative splicing. The purpose of the CLIP experiment was to determine direct targets of QKI.

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The landscape of alternative polyadenylation during EMT and its regulation by the RNA-binding protein Quaking [PAT-seq]

Project description:Epithelial-mesenchymal transition (EMT) plays important roles in tumour progression and is orchestrated by dynamic changes in gene expression. While it is well established that post-transcriptional regulation plays a significant role in EMT, the extent of alternative polyadenylation (APA) during EMT has not yet been explored. Using 3’ end anchored RNA sequencing, we mapped the alternative polyadenylation landscape (APA) following TGF-β-mediated induction of EMT in human mammary epithelial cells and found APA generally causes 3’UTR lengthening during this cell state transition. Investigation of potential mediators of APA indicated the RNA-binding protein Quaking (QKI), a splicing factor induced during EMT, regulates a small subset of events including the length of its own transcript. Analysis of QKI CLIP-seq data identified the binding of QKI within 3’UTRs was enriched near cleavage and polyadenylation sites. Following QKI knockdown, APA of many transcripts are altered to produce predominantly shorter 3’UTRs associated with reduced gene expression. These findings reveal the changes in APA that occur during EMT and identify a potential role for QKI in this process.

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The landscape of alternative polyadenylation during EMT and its regulation by the RNA-binding protein Quaking [PANQKI_HITS-CLIP]

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An EMT-driven alternative splicing program occurs in human breast cancer and modulates cellular phenotype.

Project description:Regulation of cell-cell junction formation and regulation of cell migration were enriched among EMT (Epithelial-Mesenchymal Transition)-associated alternatively splicing events. Our analysis suggested that most EMT-associated alternative splicing events are regulated by one or more members of the RBFOX, MBNL, CELF, hnRNP or ESRP classes of splicing factors. The EMT alternative splicing signature was confirmed in human breast cancer cell lines, which could be classified into basal and luminal subtypes based exclusively on their EMTassociated splicing pattern. Expression of EMT-associated alternative mRNA transcripts was also observed in primary breast cancer samples, indicating that EMT-dependent splicing changes occur commonly in human tumors. The functional significance of EMT-associated alternative splicing was tested by expression of the epithelial-specific splicing factor ESRP1 or depletion of RBFOX2 in mesenchymal cells, both of which elicited significant changes in cell morphology and motility towards an epithelial phenotype, suggesting that splicing regulation alone can drive critical aspects of EMT-associated phenotypic changes. The molecular description obtained here may aid in the development of new diagnostic and prognostic markers for analysis of breast cancer progression. Examination of transcriptomes of HMLE/Twist-ER before and after induction of EMT by tamoxifen

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2019-12-11 | GSE139074 | GEO

Expression and alternative splicing data from 1-month-old Rbfox1 KO brain

Project description:Rbfox1 regulates the alternative splicing of many transcripts in neurons. We have characterized the Rbfox1-dependent changes in expression and alternative splicing by comparing Rbfox1-KO brain to WT brain. In this dataset, we include the splicing and expression data obtained from dissected WT and Rbfox1 KO mouse brains. 6 total samples were analyzed: brains from 3 WT male mice and 3 Rbfox1 KO male mice, all 1 month of age.

2011-05-16 | E-GEOD-28421 | biostudies-arrayexpress

The splicing regulator Rbfox1 (A2BP1) controls neuronal excitation in the mammalian brain

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Filamin B extensively regulates the transcription and alternative splicing and is associated with apoptosis in HeLa cells

Project description:Post-transcriptional mechanisms is an important means for the body to fight against cancer, and it may also be hijacked by tumor cells to help them adapt to local microenvironment. Filamin B (FLNB), an actin-binding protein and providing crucial scaffolds for cell motility and signaling, was also identified as one of RNA binding proteins (RBPs). Recent works showed that FLNB might play important role not only in skeletal development but also in the regulation of tumorigenesis. However, the effects of dysregulated expression of FLNB at a molecular level are unclear. In this study, we used RNA-seq to analyze the global transcriptional level changes and alternative splicing between the knocked-down FLNB and the control in Hela cells. Reduced levels of FLNB led to a significant decrease in cell apoptosis, compared with control cells. FLNB knockdown extensively regulated the expression of genes in cell apoptosis, tumorigenesis, metastases, transmembrane transport, cartilage and nerve development. Moreover, FLNB regulated alternative splicing of a large number of genes enriched in cell death and apoptotic process. Meanwhile, some genes and alternative splicing related to skeletal development were enriched and regulated by FLNB. Quantitative RT-PCR confirmed the FLNB-regulated transcription and alternative splicing. This study provides the first transcriptome-wide analysis of FLNB. Our findings indicated that FLNB may play an important regulatory role in cancer cell apoptosis via the regulation of alternative splicing and potentially transcription, which greatly expands the current understanding of the mechanisms of FLNB mediated gene regulation.

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