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Transcriptome-wide mapping of human Staufen1 binding sites

ABSTRACT: Purpose: We performed RNA-Immunoprecipitation in Tandem (RIPiT) experiments against human Staufen1 (Stau1) to identify its precise RNA binding sites in a transcriptome-wide manner. To monitor the consequences of Stau1 binding in terms of target mRNA levels and ribosome occupancy, we modified the levels of endogenous Stau1 in cells by siRNA or overexpression and performed RNA-sequencing and ribosome-footprinting experiments. Staufen1 (Stau1) is a double-stranded RNA (dsRNA) binding protein implicated in mRNA transport, regulation of translation, mRNA decay and stress granule homeostasis. Here we combined RNA-Immunoprecipitation in Tandem (RIPiT) with RNase footprinting, formaldehyde crosslinking, sonication-mediated RNA fragmentation and deep sequencing to map Staufen1 binding sites transcriptome-wide. We find that Stau1 binds complex secondary structures containing multiple short helices, many of which are formed by inverted Alu elements in annotated 3'UTRs or in "strongly distal" 3'UTRs extending far beyond the canonical polyadenylation signal. Stau1 also interacts with both actively translating ribosomes and with mRNA coding sequences (CDS) and 3'UTRs in proportion to their GC-content and internal secondary structure-forming propensity. On mRNAs with high CDS GC-content, higher Stau1 levels lead to greater ribosome densities, suggesting a general role for Stau1 in modulating the ability of ribosomes to elongate through secondary structures located in CDS regions.

ORGANISM(S): Homo sapiens

PROVIDER: GSE52447 | GEO | 2013/11/25

SECONDARY ACCESSION(S): PRJNA229103

REPOSITORIES: GEO

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Transcriptome-wide mapping of human Staufen1 binding sites

Project description:Purpose: We performed RNA-Immunoprecipitation in Tandem (RIPiT) experiments against human Staufen1 (Stau1) to identify its precise RNA binding sites in a transcriptome-wide manner. To monitor the consequences of Stau1 binding in terms of target mRNA levels and ribosome occupancy, we modified the levels of endogenous Stau1 in cells by siRNA or overexpression and performed RNA-sequencing and ribosome-footprinting experiments. Staufen1 (Stau1) is a double-stranded RNA (dsRNA) binding protein implicated in mRNA transport, regulation of translation, mRNA decay and stress granule homeostasis. Here we combined RNA-Immunoprecipitation in Tandem (RIPiT) with RNase footprinting, formaldehyde crosslinking, sonication-mediated RNA fragmentation and deep sequencing to map Staufen1 binding sites transcriptome-wide. We find that Stau1 binds complex secondary structures containing multiple short helices, many of which are formed by inverted Alu elements in annotated 3'UTRs or in "strongly distal" 3'UTRs extending far beyond the canonical polyadenylation signal. Stau1 also interacts with both actively translating ribosomes and with mRNA coding sequences (CDS) and 3'UTRs in proportion to their GC-content and internal secondary structure-forming propensity. On mRNAs with high CDS GC-content, higher Stau1 levels lead to greater ribosome densities, suggesting a general role for Stau1 in modulating the ability of ribosomes to elongate through secondary structures located in CDS regions. We used HEK293 cells expressing near endogenous levels of wild-type Flag-Stau1 (65KDa isoform with an N-Terminal Flag tag). As a control we used a mutant version of Stau1 that is not functional for dsRNA binding. Formaldehyde crosslinking experiments and RNase footprinting experiments were done in two biological replicates. All RNASeq, Ribosome footprinting and PAS-Seq were done in two biological replicates.

2013-11-25 | E-GEOD-52447 | biostudies-arrayexpress

IP Staufen1

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2008-06-16 | E-GEOD-8438 | biostudies-arrayexpress

Staufen1 regulates a variety of mammalian transcripts

Project description:It is currently unknown how extensively the double-stranded RNA binding protein Staufen (Stau)1 is utilized by mammalian cells to regulate gene expression. To date, Stau1 binding to the 3’ untranslated region (3’UTR) of ARF1 mRNA has been shown to target ARF1 mRNA for Stau1-mediated mRNA decay (SMD). ARF1 SMD depends on translation and recruitment of the nonsense-mediated mRNA decay factor Upf1 to the ARF1 3’UTR by Stau1. Here, we use microarray analyses to examine changes in the abundance of cellular mRNAs that occur when Stau1 is depleted. Results indicate that 1.1% and 1.0% of the 11,569 HeLa-cell transcripts that were analyzed are, respectively, upregulated and downregulated at least two-fold in three independently performed experiments. Additionally, we localize the Stau1 binding site to the 3’UTR of four mRNAs that we define as natural SMD targets. Together, these and substantiating results suggest that Stau1 influences the expression of a wide variety of physiologic transcripts and metabolic pathways. Keywords: Staufen1-mediated mRNA decay; Stau1 downregulation by siRNA.

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3'READS+RIP defines differential Staufen1 binding to alternative 3'UTR isoforms and reveals structures and sequence motifs influencing binding and polysome association

Project description:Using 3ʹ region extraction and deep sequencing coupled to ribonucleoprotein immunoprecipitation (3’READS+RIP), together with reanalyzing previous STAU1 binding and RNA structure data, we delineate STAU1 interactions transcriptome-wide, including binding differences between alternative polyadenylation (APA) isoforms. Consistent with previous reports, RNA structures are dominant features for STAU1 binding to CDSs and 3ʹUTRs. Overall, relative to short 3ʹUTR counterparts, longer 3ʹUTR isoforms of genes have stronger STAU1 binding, most likely due to a higher frequency of RNA structures, including specialized IRAlus. However, a sizable fraction of genes express transcripts showing the opposite trend, attributable to AU-rich sequences in their alternative 3'UTRs, possibly recruiting antagonistic RBPs and/or destabilizing STAU1-binding RNA structures. Using STAU1-knockout cells, we show that strong STAU1 binding to mRNA 3'UTRs generally enhances polysome association. However, IRAlus have little impact on STAU1-mediated polysome association despite having strong interactions with the protein.

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Transcriptome-wide analysis of RNA structure in MCF7 cells with and without inhibition of eIF4A by hippuristanol treatment

Project description:Translational dysregulation is an emerging hallmark of cancer, and increased activity of the mRNA helicase eIF4A is associated with poor survival in malignancies. This is believed to be due to the unwinding of secondary structures within the 5’UTRs of oncogenic mRNAs, with studies showing that in general eIF4A-dependent mRNAs have longer 5’UTRs with more stable secondary structures, yet our ability to predict eIF4A-dependency from 5’UTR properties alone remains poor. We therefore used Structure-seq 2 to measure transcriptome-wide changes in RNA structure in MCF7 cells, following eIF4A inhibition with hippuristanol. This technique measures the single-strandedness of RNA by specific and rapid methylation of single-stranded adenosines and cytosines with Dimethyl Sulphate (DMS). When paired with polysome profiling data to identify which mRNAs are most translationally repressed, we can identify the structural determinants of eIF4A-dependency. Upon eIF4A inhibition, both 5’UTRs and CDSs become generally more structured, while overall this was not observed for 3’UTRs. This was most pronounced in CDSs, supporting recent findings that the ribosome sculpts RNA structure in this region. 5’UTRs are generally more structured at their 5’ ends and highly translated mRNAs are less structured just upstream of the CDS. Following eIF4A inhibition, the 5’UTR is remodelled. eIF4A-dependent mRNAs have greater localised gains of structure. The degree of these structural changes is strongly correlated with 5’UTR length, explaining why eIF4A-dependent mRNAs have longer 5’UTRs. Crucially, in eIF4A-dependent mRNAs these highly-structured elements are located predominantly at the 3’ end of the 5’UTR, suggesting that increased structure just upstream of the CDS is most inhibitory to translation following eIF4A inhibition and is a key determinant of eIF4A-dependency.

2019-11-26 | GSE134865 | GEO

m6A in mRNA coding regions promotes translation via the RNA helicase-containing YTHDC2

Project description:Dynamic mRNA modification in the form of N6-methyladenosine (m6A) adds considerable richness and sophistication to gene regulation. The m6A mark is asymmetrically distributed along mature mRNAs, with a strong preference around the stop codon and 3’UTR. Nevertheless, approximately 35% of m6A residues are located within the coding region (CDS). It has been suggested that methylation in CDS slows down translation elongation by interfering the decoding process. However, neither the decoding feature of endogenous mRNAs nor the physiological significance of CDS m6A has been clearly defined. By integrating Ribo-seq and m6A-seq data sets, we found that CDS m6A methylation leads to ribosome pausing in a codon-specific manner. Unexpectedly, removing CDS m6A modification from these transcripts results in a further decrease of translation. A systemic analysis of RNA structural datasets revealed that CDS m6A methylation positively regulates translation by resolving mRNA secondary structures. We further demonstrate that the elongation-promoting effect of CDS methylation requires the RNA helicase-containing m6A reader YTHDC2. Our findings established the physiological significance of CDS methylation and uncovered non-overlapping function of m6A reader proteins.

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Staufen1 Represses the FOXA1-Regulated Transcriptome by Destabilizing FOXA1 mRNA in Colorectal Cancer Cells

Project description:Transcription factors play key roles in development and diseases by controlling gene expression. Forkhead Box A1 (FOXA1) is a pioneer transcription factor essential for mouse development that plays important roles in prostate and breast cancer. In colorectal cancer (CRC), we have found that FOXA1 is significantly downregulated, suggesting potential tumor suppressive functions. However, the mechanism(s) by which FOXA1 is downregulated in CRC cells remain largely unclear. We investigated the regulation of FOXA1 expression in CRC, focusing on well-differentiated CRC cells where it is robustly expressed. Genome-wide stability assays identified FOXA1 as an unstable mRNA in CRC cells. We validated FOXA1 mRNA instability in multiple CRC lines and patient-derived CRC organoids and found FOXA1 mRNA is degraded via its 3’UTR. Through FOXA1 3’UTR RNA pulldowns, we identified Staufen1 (STAU1) as a potential regulator of FOXA1. Indeed, knockdown of STAU1 results in increased expression of FOXA1 mRNA and protein due to increased FOXA1 mRNA stability. A subset of the STAU1-regulated transcriptome is enriched for FOXA1 targets, whose expression also increases upon STAU1 knockdown. Collectively, this study uncovers the molecular mechanism by which FOXA1 is regulated in CRC and provides insights into our understanding of the complex mechanisms of gene regulation in cancer.

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Knockout of Staufen1 impairs the localization of specific subsets of mRNAs on the mitotic spindle of colorectal cancer cells

Project description:Staufen1 (STAU1) is an RNA-binding protein involved in maturation, localization, translation and decay of mRNAs. STAU1 expression is modulated during the cell cycle and decreases during mitosis. In prometaphase, STAU155 binds specific classes of mRNAs that code for proteins implicated in transcription and cell cycle regulation. In this paper, we report that STAU155 co-localizes with microtubules on the mitotic spindle in human colorectal cancer cell line HCT116, and map the molecular determinant required for this association within the N-terminal 88 amino acids (aa 25-37). Interestingly, STAU1 co-purifies with ribosomal proteins and co-localizes with active sites of translation on the mitotic spindle. To characterize STAU1-dependent mRNA transport and localization on the spindle, we used RNAseq analysis to identify spindle-associated mRNAs on purified spindles of wild-type and STAU1-KO CRISPR cell lines. Our datasets identify 161 protein-coding transcripts that are less abundant on the mitotic spindle of STAU1-KO cells compared to WT, and 660 that are more abundant. Altogether, these data demonstrate that STAU1 controls the transport and the localization of specific sub-populations of mRNAs to the mitotic spindle of cancer cells and suggest that at least some spindle-localized mRNAs undergo local translation during mitosis.

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Impact of STAU1 depletion on the protein expression profile of rhabdomyosarcoma cell lines

Project description:Two human rhabdomyosarcoma cell lines (RD, RH36, RH30, and RH18) and one none-transformed skeletal muscle cell line (HSMM-C3) cell line were studied for the impact of Staufen1 depletion on their protein expression profile. Proteomics was performed for control and Staufen1 knockdown cells (n=3). For this, we generated STAU1 knockdown cell lines using a mixture of three independent STAU1-targeting lentiviral-shRNA constructs. cells were cultured for 72 hours and then protein extraction was performed as follow: Cells were lysed in 1X RIPA buffer (20 mM Tris-HCl (pH 7.5), 150mM NaCl, 1mM Na2- EDTA, 1mM EGTA, 1% NP-40, 1% sodium deoxycholate, 2.5 mM sodium pyrophosphate, 1mM β-glycerophosphate, 1mM Na3 VO4, 1µg/ml leupeptin). Protein concentration was tested according to the BCA assay protocol (Thermofisher Scientific) and samples were used in proteomics experiment.

2023-10-22 | PXD042156 | Pride

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