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Effect of SRSF2 over-expression in a human lung carcinoma cell line

ABSTRACT: We showed that the over-expression of the SR protein SRSF2 led to the regulation of transcript abundance of many genes. H358 cell line with 6 samples with SRSF2 over-expression and 6 samples as control.

ORGANISM(S): Homo sapiens

SUBMITTER: Laurent Corcos

PROVIDER: E-GEOD-50467 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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A dedicated microarray for in-depth analysis of pre-mRNA splicing events: application to the study of genes involved in the response to targeted anticancer therapies.

Pesson Marine M Eymin Béatrice B De La Grange Pierre P Simon Brigitte B Corcos Laurent L

Molecular cancer 20140115

Alternative pre-mRNA splicing (AS) widely expands proteome diversity through the combinatorial assembly of exons. The analysis of AS on a large scale, by using splice-sensitive microarrays, is a highly efficient method to detect the majority of known and predicted alternative transcripts for a given gene. The response to targeted anticancer therapies cannot easily be anticipated without prior knowledge of the expression, by the tumor, of target proteins or genes. To analyze, in depth, transcript ...[more]

PMID: 24428911

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SRSF2 is essential for hematopoiesis and its myelodysplastic syndromes-related mutations dysregulate alternative pre-mRNA splicing

Project description:We report the biological function of Srsf2 in hematopoiesis in conditional knockout mouse models. Ablation of Srsf2 in the hematopoietic lineage caused embryonic lethality, and Srsf2-deficient fetal liver cells showed significantly enhanced apoptosis and decreased hematopoietic stem/progenitor cells. Induced ablation of Srsf2 in adult Mx1Cre/ Srsf2flox/flox mice upon polyinosinic:polycytidylic acid injection demonstrated a significant decrease in lineage-/Sca+/cKit+ cells in bone marrow. To reveal the functional impact of MDS-associated mutations in SRSF2, we profiled global splicing responses on an MDS-L cell line using RASL-seq, and found that the P95H missense mutation and P95 to R102 in-frame 8 amino-acid deletion caused significant changes in alternative splicing. The affected genes were enriched in cancer development and apoptosis. These findings suggest that intact Srsf2 is essential for the functional integrity of the hematopoietic system, and its mutations are likely key driver events to MDS. MDS-L cells (in triplicate) were transfected by srsf2 shRNA only, or pTRIPZ vectors containing both srsf2 shRNA and srsf2 mutants cDNA including P95H and P95 8 amino acid deletion as well as wild-type construct, followed by Dox induction. Total RNAs were extracted and been analyzed by RASL-seq.

2015-03-01 | E-GEOD-61052 | biostudies-arrayexpress

Genome-wide Analysis Reveals SR Protein Cooperation and Competition in Regulated Splicing

Project description:SR proteins are well-characterized RNA binding proteins that promote exon inclusion by binding to exonic splicing enhancers (ESEs). However, it has been unclear whether regulatory rules deduced on model genes apply generally to activities of SR proteins in the cell. Here, we report global analyses of two prototypical SR proteins SRSF1 (SF2/ASF) and SRSF2 (SC35) using splicing-sensitive arrays and CLIP-seq on mouse embryo fibroblasts (MEFs). Unexpectedly, we find that these SR proteins promote both inclusion and skipping of exons in vivo, but their binding patterns do not explain such opposite responses. Further analyses reveal that loss of one SR protein is accompanied by coordinated loss or compensatory gain in the interaction of other SR proteins at the affected exons. Therefore, specific effects on regulated splicing by one SR protein actually depend on a complex set of relationships with multiple other SR proteins in mammalian genomes. SRSF1 and SRSF2 CLIP-seq

2013-04-05 | E-GEOD-44591 | biostudies-arrayexpress

Comparison of gene expression in control and BRG1-knockdown H358 cell lines

Project description:Transcription was assessed in the human H358 NSCLC cell line after knockdown of BRG1, one of the mutually exclusive subunits of the SWI/SNF chromatin remodeling complex, by 2 different shRNAs. One biolgical replicate of each treatment; 4 technical replicates of each treatment.

2014-09-23 | E-GEOD-58542 | biostudies-arrayexpress

SR Proteins Collaborate with 7SK and Promoter-Associated Nascent RNA to Release Paused Polymerase

Project description:RNAP II is frequently paused near gene promoters in mammals and its transition to productive elongation requires active recruitment of P-TEFb, a cyclin-dependent kinase for RNAP II and other key transcription elongation factors. A fraction of P-TEFb is sequestered in an inhibitory complex containing the 7SK noncoding RNA, but it has been unclear how P-TEFb is switched from the 7SK complex to RNAP II during transcription activation. We report that SRSF2 (also known as SC35, an SR splicing factor) is part of the 7SK complex assembled at gene promoters and plays a direct role in transcription pause release. We demonstrate RNA-dependent, coordinated release of SRSF2 and P-TEFb from the 7SK complex and transcription activation via SRSF2 binding to promoter-associated nascent RNA. These findings reveal an unanticipated SR protein function, a role for promoter-proximal nascent RNA in gene activation, and an analogous mechanism to HIV Tat/TAR for activating cellular genes. SR ChIP-seq, Pol II ChIP-seq, and Gro-seq

2013-05-09 | E-GEOD-45517 | biostudies-arrayexpress

SRSF2 mutations impair hematopoiesis and alter exon recognition

Project description:Mutations within genes encoding spliceosomal proteins are the most common class of mutations in patients with myelodysplastic syndromes, yet it is currently not well understood how these mutations impact hematopoiesis or RNA splicing. Here we report that mutations affecting the splicing factor SRSF2 alter its normal RNA recognition activity, resulting in impaired hematopoietic differentiation and myelodysplasia. Commonly occurring SRSF2 mutations impaired wildtype SRSF2’s normal RNA-binding avidity and preference for specific exonic splicing enhancer RNA motifs. Integration of murine and human transcriptome data identified recurrent mis-splicing of key transcriptional regulators in the presence of mutant SRSF2, including promotion of a highly conserved “poison” exon of EZH2 that results in nonsense-mediated decay and contributes to impaired hematopoiesis. These data provide a mechanistic basis for the enrichment of specific mutations in spliceosomal proteins in myelodysplasia, and suggest that altered RNA recognition activity is a novel mechanism of leukemogenesis. mRNA profiles of murine model and K562 cells expressing SRSF2 WT, mutants and knockdown of SRSF2 in TF-1 cells generated by deep sequencing.

2015-05-12 | E-GEOD-65349 | biostudies-arrayexpress

Targeting mitophagy in SRSF2 mutant hematologic malignancies

Project description:Recurrent Glycogen synthase kinase-3 (GSK-3) phosphorylates multiple splicing factors, including SRSF2, and regulates the splicing of a broad range of mRNAs in human cells. Inhibition of GSK-3 disrupts splicing and promotes cell death in hematopoietic cells with heterozygous mutations in SRSF2 and not in cells with wild-type splicing factors. To characterize how GSK-3 inhibition alters the cellular proteome in SRSF2-P95H/+ cells, we have performed quantitative mass spectrometry (qMS) on K562 cells with SRSF2P95H/+ knocked into the endogenous locus (PMID 30799057) and parental K562 cells, treated with the GSK-3 inhibitor CHIR99021. We focused on the mitochondrial proteome using human proteome (UniprotKB) and mitochondrial (MitoCarta 3.0) databases for protein identification, identifying 163 mitochondrial proteins whose levels are affected by SRSF2 mutation.

2024-06-22 | PXD043213 | Pride

Targeting Focal Adhesion Kinase overcomes erlotinib resistance in smoke induced lung cancer by altering phosphorylation of Epidermal Growth Factor Receptor

Project description:Cigarette smoking is the leading cause for non-small cell lung carcinoma (NSCLC). Tyrosine kinase inhibitors (TKIs) targeting EGFR are in clinical practice and has benefitted patients with EGFR mutations. However, EGFR based targeted therapies have shown limited success in smokers. Identification of alternate signaling mechanism(s) leading to TKI resistance in smokers is critical for developing novel therapies for lung cancer. We observed increased resistance to erlotinib in H358 lung cancer cells exposed to cigarette smoke (H358-S) compared to parental cells. To systematically identify signaling pathways that could potentially confer resistance to erlotinib, we carried out stable isotope labeling by amino acids in cell culture (SILAC)-based phosphotyrosine analysis of H358-S and parental cells. We identified 238 unique phosphosites, of which 111 phosphosites were hyperphosphorylated (≥ 2-fold¬¬¬¬¬¬) in H358 -S cells. Importantly, we observed hyperphosphorylation of EGFR at Y1197 and non-receptor tyrosine kinases, including FAK and FRK in H358-S cells. Inhibition of FAK with its inhibitor PF-562271 led to decreased cellular proliferation and invasive ability of the smoke exposed cells. Further, we observed that treatment with PF-562271 could restore dependency of H358-S cells on EGFR signaling.

2018-03-21 | PXD006705 | Pride

Disease-associated mutation in SRSF2 misregulates splicing by altering RNA binding affinities

Project description:SRSF2 is an RNA binding protein that plays important roles in splicing of mRNA precursors. Mutations in SRSF2 are frequently found in patients with myelodysplastic syndromes and certain leukemias, but how they affect SRSF2 function has only begun to be examined. Here we used CRISPR/Cas9 to introduce the P95H mutation to SRSF2 in K562 leukemia cells, generating an isogenic model so that splicing alterations can be attributed solely to mutant SRSF2. We found that SRSF2 (P95H) misregulates 548 splicing events (<1% of total). Of these, 374 involve the inclusion of cassette exons, and the inclusion was either increased (206) or decreased (168). We detected a specific motif (UCCA/UG) enriched in the more included exons and a distinct motif (UGGA/UG) in the more excluded exons. RNA gel shift assays showed that a mutant SRSF2 derivative bound more tightly than its wild-type counterpart to RNA sites containing UCCAG, but less tightly to UGGAG sites. The pattern of exon inclusion or exclusion thus correlated in most cases with stronger or weaker RNA binding, respectively. We further show that the P95H mutation does not affect other functions of SRSF2, i.e., protein-protein interactions with key splicing factors. Our results thus demonstrate that the P95H mutation positively or negatively alters the binding affinity of SRSF2 for cognate RNA sites in target transcripts, leading to misregulation of exon inclusion. Our findings not only shed light on the mechanism of the disease-associated SRSF2 mutation in splicing regulation, but also reveal a group of mis-spliced mRNA isoforms for potential therapeutic targeting. Examination of differentially spliced events in K562 CRISPR cell clones (with wild-type or mutant SRSF2) by RNA sequencing

2015-08-10 | E-GEOD-71299 | biostudies-arrayexpress

Next-generation sequencing analysis of 7-month-old SRSF2 flox/flox and SRSF2-PKO mice pancreatic islet transcriptome

Project description:We report insulin secretion defects in SRSF2 Ins2-Cre mice, in which SRSF2 is ablated in pancreatic β cells.

2024-04-28 | GSE175969 | GEO

SRSF2 is required for mRNA splicing and spermatogenesis [LACE-seq]

Project description:Serine/arginine-rich splicing factor 2 (SRSF2), also known as SC35, is a member of a SRs protein family, which plays significant roles in numerous fundamental biological activities. However, the roles and underlying mechanisms of SRSF2 remain largely unclear during spermatogenesis. Here, we report that SRSF2 is involved in alternative splicing and that male germ cell-specific deletion of Srsf2 by Stra8-GFPCre causes absolute infertility and defective spermatogenesis. Further analyses revealed that deletion of Srsf2 in the male germ cells had harmful influences on the differentiation of spermatogonia and meiosis initiation. Mechanistically, by combining RNA-seq data with LACE-seq data, we showed that spermatogenesis, meiotic cell cycle, male gamete generation, reproductive development, and male sex differentiation were involved in the SRSF2 regulatory networks. Furthermore, SRSF2 affects expression and AS of Stra8, Stag3 and Atr in a direct manner, which were critical factors during spermatogenesis. Taken together, our results demonstrate that SRSF2 has important functions in spermatogenesis and male fertility by regulating alternative splicing.

2023-08-18 | GSE206536 | GEO

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