RNA splicing in the transition from B cells to antibody secreting cells
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE113317 | GEO | 2018/04/19
REPOSITORIES: GEO
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Project description:RNA splicing in the transition from B cells to antibody secreting cells
| PRJNA450826 | ENA
Project description:Processing of Immunoglobulin heavy chain (IgH) mRNA is a paradigm for competition between splicing and polyadenylation. In plasma cells pre-mRNA is polyadenylated mainly at the promoter-proximal secretory site while B-cells utilize a cryptic 5’ splice site in the last secretory-specific exon; these are mutually exclusive events for all IgH pre-mRNAs. Transcription elongation factor ELL2, more abundant in plasma cells relative to B-cells, was down-modulated by overexpression of heterogenous ribonucleoprotein F, a condition which reduced production of secretory IgH mRNA. Transfection of B-cells with ELL2 and the IgH reporter showed an accelerated use of the secretory poly(A) site, positioned in competition with the splice to M1; a small interfering RNA to ELL2 reduced expression of IgH secretory mRNA. Co-transcription factors ELL1 and PC4 were ineffective at driving secretory-poly(A) site use. ELL2 had little effect on poly(A) site choice with reporters containing tandem-linked poly(A) sites. Shorter forms of ELL2 protein result from both internal initiation at M186 and protein processing. An alternative splicing reporter driven by IgH or non-Ig promoters revealed that ELL2 and its M186 initiated form were able to accelerate exon skipping. Therefore, ELL2 influences IgH pre-mRNA processing through facilitating skipping of the alternative splice to the membrane form.
2008-06-01 | GSE11586 | GEO
Project description:Processing of Immunoglobulin heavy chain (IgH) mRNA is a paradigm for competition between splicing and polyadenylation. In plasma cells pre-mRNA is polyadenylated mainly at the promoter-proximal secretory site while B-cells utilize a cryptic 5â?? splice site in the last secretory-specific exon; these are mutually exclusive events for all IgH pre-mRNAs. Transcription elongation factor ELL2, more abundant in plasma cells relative to B-cells, was down-modulated by overexpression of heterogenous ribonucleoprotein F, a condition which reduced production of secretory IgH mRNA. Transfection of B-cells with ELL2 and the IgH reporter showed an accelerated use of the secretory poly(A) site, positioned in competition with the splice to M1; a small interfering RNA to ELL2 reduced expression of IgH secretory mRNA. Co-transcription factors ELL1 and PC4 were ineffective at driving secretory-poly(A) site use. ELL2 had little effect on poly(A) site choice with reporters containing tandem-linked poly(A) sites. Shorter forms of ELL2 protein result from both internal initiation at M186 and protein processing. An alternative splicing reporter driven by IgH or non-Ig promoters revealed that ELL2 and its M186 initiated form were able to accelerate exon skipping. Therefore, ELL2 influences IgH pre-mRNA processing through facilitating skipping of the alternative splice to the membrane form. Experiment Overall Design: AxJ plasma cells were stably transfected to overexpress hnRNP-F, -H or empty vector. Clones showing high overexpression levels of F or H by western blot were selected. The IgH sec to mb ratios of these clones were determined. A global gene expression analysis was performed on mRNA from two clones from hnRNP-F, which demonstrated a lower sec:mb ratio, and one from each of the controls: overexpression of hnRNP-H, or transfection with empty vector, or A20 B-cells, using Affymetrix gene micro array technology.
2008-06-18 | E-GEOD-11586 | biostudies-arrayexpress
Project description:We report RNA-Seq data from MPC11 plasmacytoma cell lines transduced with either control hairpins (shGFP) or hairpins targeting the transcriptional elongation factor ELL2. ELL2 has been identified as regulating the alternative splicing and polyadenylation of immunoglobulin pre-mRNA, and is highly expressed by plasma cells but not other B cells. Notably, ELL2 drives the accumulation of transcripts encoding secreted immunoglobulin at the expense of membrane-associated transcripts. This study sought to examine the impact of ELL2 on mRNA processing at the transcriptome level, and found that ELL2 controls the alternative processing of 12% of annotated transcripts in MPC11 cells. Examination of pre-mRNA splicing patterns in either control or ELL2-depleted cells
2012-09-07 | E-GEOD-40285 | biostudies-arrayexpress
Project description:We report RNA-Seq data from MPC11 plasmacytoma cell lines transduced with either control hairpins (shGFP) or hairpins targeting the transcriptional elongation factor ELL2. ELL2 has been identified as regulating the alternative splicing and polyadenylation of immunoglobulin pre-mRNA, and is highly expressed by plasma cells but not other B cells. Notably, ELL2 drives the accumulation of transcripts encoding secreted immunoglobulin at the expense of membrane-associated transcripts. This study sought to examine the impact of ELL2 on mRNA processing at the transcriptome level, and found that ELL2 controls the alternative processing of 12% of annotated transcripts in MPC11 cells.
2012-09-07 | GSE40285 | GEO
Project description:In the transition from B cells to Ab-secreting cells (ASCs) many genes are induced, such as ELL2, Irf4, Prdm1, Xbp1, whereas other mRNAs do not change in abundance. Nonetheless, using splicing array technology and mouse splenic B cells plus or minus LPS, we found that induced and "uninduced" genes can show large differences in splicing patterns between the cell stages, which could influence ASC development. We found that ?55% of these splicing changes depend on ELL2, a transcription elongation factor that influences expression levels and splicing patterns of ASC signature genes, genes in the cell-cycle and N-glycan biosynthesis and processing pathways, and the secretory versus membrane forms of the IgH mRNA. Some of these changes occur when ELL2 binds directly to the genes encoding those mRNAs, whereas some of the changes are indirect. To attempt to account for the changes that occur in RNA splicing before or without ELL2 induction, we examined the amount of the small nuclear RNA molecules and found that they were significantly decreased within 18 h of LPS stimulation and stayed low until 72 h. Correlating with this, at 18 h after LPS, endoplasmic reticulum stress and Ire1 phosphorylation are induced. Inhibiting the regulated Ire1-dependent mRNA decay with 4u8C correlates with the reduction in small nuclear RNA and changes in the normal splicing patterns at 18 h. Thus, we conclude that the RNA splicing patterns in ASCs are shaped early by endoplasmic reticulum stress and Ire1 phosphorylation and later by ELL2 induction.
| S-EPMC6219926 | biostudies-literature
Project description:RNA expression of unstimulated γδ-T cells,γδ-TCR-stimulated γδ-T cells, unstimulated αβ-TCR transduced γδ-T cells and αβ-TCR-stimulated αβ-TCR transduced γδ-T cells.
2023-09-07 | GSE216880 | GEO
Project description:Long-lived human plasma cells (PCs) play central roles in immunity and autoimmunity and are enriched among the subpopulation of CD19neg human PCs. However, whether human CD19neg PCs are necessarily aged cells that have gradually lost CD19 expression is not known. Assessing peripheral blood samples at steady-state and during the acute response to influenza vaccination in healthy donors, we identify the presence of phenotypic CD19neg plasmablasts, the proliferative precursor state to mature PCs, and demonstrate by ELISPOT that these are Ab-secreting cells (ASCs). During the acute response to influenza vaccination, CD19pos, CD19low, and CD19neg ASCs secrete vaccine-specific Abs and show linked IGHV repertoires. To address precursor/product relationships, we use in vitro models that mimic T-dependent and T-independent differentiation, finding that the CD19neg state can be established at the plasmablast to PC transition, that CD19neg PCs increase as a percentage of surviving PCs in vitro, and that CD19neg and CD19pos PCs can be maintained independently. These data provide proof-of-principle for the view that newly generated ASCs can acquire a mature PC phenotype that is accompanied by loss of CD19 expression at an early stage of differentiation and that aging is not an obligate requirement for a CD19neg state to be established.
| S-EPMC5458329 | biostudies-literature
Project description:Alternative splicing achieves coordinated changes in post-transcriptional gene expression programs through the activities of diverse RNA binding proteins. Epithelial Splicing Regulatory Proteins 1 and 2 (ESRP1 and ESRP2) are cell type-specific regulators of transcripts that switch splicing during the Epithelial Mesenchymal Transition (EMT). To define a comprehensive program of alternative splicing that is regulated during the EMT, we identified an extensive ESRP-regulated splicing network of hundreds of alternative splicing events within numerous genes with roles in cell-cell adhesion, polarity, and migration. Loss of this global ESRP-regulated epithelial splicing program induces the phenotypic changes in cell morphology that are observed during the EMT. Components of this splicing signature provide novel molecular markers that can be used to characterize the EMT. Bioinformatics and experimental approaches revealed a high affinity ESRP binding motif and a predictive RNA map that governs their activity. This work establishes the ESRPs as coordinators of a complex alternative splicing network that adds an important post-transcriptional layer to the changes in gene expression that underlie epithelial-mesenchymal transitions during development and disease. Keywords: control / knockdown comparison and control / ectopic expression comparison
2010-08-23 | GSE22937 | GEO