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BLIMP1 controls GC B cell expansion and exit through regulating cell cycle progression and key transcription factors BCL6 and IRF4.

ABSTRACT: BLIMP1 controls GC B cell expansion and exit through regulating cell cycle progression and key transcription factors BCL6 and IRF4.

PROVIDER: PRJNA1275040 | ENA |

REPOSITORIES: ENA

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BLIMP1 controls GC B cell expansion and exit through regulating cell cycle progression and key transcription factors BCL6 and IRF4

Project description:In B cells BLIMP1 is required for plasma cell differentiation. BLIMP1 is also expressed in some dark zone (DZ) germinal center (GC) B cells (GCBCs), yet the role of BLIMP1 in GCBCs is not understood. Here we generated mixed bone marrow (BM) chimeric mice using Prdm1+/+ CD19Cre and Prdm1fl/fl CD19Cre BM, allowing us to examine the cell-intrinsic functions of BLIMP1 in GCBC, independent of antibody or antigen levels. Strikingly, BLIMP1-deficient B cells quickly dominate GCs and persist for a much longer time compared to the wild type cells. BLIMP1 deficiency promotes positive selection of GCBC and enhances cell-cycle progression. In addition, BLIMP1 deficiency enhanced class-switching. Mechanistically, BLIMP1-deficient GCBC fail to downregulate BCL6 and to upregulate IRF4, indicating that BLIMP1 controls the expression of these transcription factors that mediate exit from the GC. These studies revealed unique functions of BLIMP1 in regulating GCBC responses that impact long-lived immune compartments.

2024-03-28 | GSE249811 | GEO

BLIMP1 controls GC B cell expansion and exit through regulating cell cycle progression and key transcription factors BCL6 and IRF4.

2025-08-15 | GSE299594 | GEO

BLIMP1 controls GC B cell expansion and exit through regulating cell cycle progression and key transcription factors BCL6 and IRF4

Project description:BLIMP1 controls GC B cell expansion and exit through regulating cell cycle progression and key transcription factors BCL6 and IRF4

| PRJNA1050777 | ENA

Population gene expression of anti-viral CD4 T cells in Bcl6 and Blimp1 deficient conditions

Project description:Population gene expression of effector CD4+ T cells WT, Bcl6-deficient , Blimp1-deficient or Bcl6 Blimp1-deficient was determined by RNAseq after LCMV Armstrong infection

2021-11-05 | GSE149597 | GEO

Single-cell gene expression of anti-viral CD4 T cells in Bcl6 and Blimp1 deficient conditions

Project description:Single-cell gene expression of effector CD4+ T cells WT, Bcl6-deficient , Blimp1-deficient or Bcl6 Blimp1-deficient was determined by scRNAseq after LCMV Armstrong infection

2021-11-05 | GSE149912 | GEO

Translocations Activating IRF4 Identify a Subtype of Germinal-Center-Derived B-cell Lymphoma Affecting Predominantly Children and Young Adults

Project description:Background: Germinal center B-cell (GCB) lymphomas are common in children and adults. The prognosis strongly depends on age. Subgroups of GCB-lymphomas are characterized by chromosomal translocations affecting immunoglobulin (IG) loci leading to oncogene deregulation. Methods: Novel IG translocation partners were cloned within the network “Molecular Mechanisms in Malignant Lymphomas” (MMML) by long-distance inverse polymerase chain reaction. Mature aggressive B-cell lymphomas from the MMML as well as pediatric and adult lymphoma trials were analyzed by fluorescence in situ hybridization (FISH) and immunhistochemistry. Data from 438 MMML cases characterized by gene expression profiling were mined. Results: Cloning of unknown IG partners identified a t(6;14)(p25;q32) juxtaposing the IRF4 oncogene with the IGH-locus as novel recurrent aberration in GCB lymphoma. FISH analyses of 427 mature B-cell lymphomas for IRF4 translocations revealed 20 IG/IRF4 positive lymphomas (17 IGH/IRF4, 2 IGL/IRF4, 1 IGΚ/IRF4). IG/IRF4-positive lymphomas were predominantly GCB-type diffuse large B-cell lymphomas (DLBCL) or follicular lymphoma grade 3, shared overexpression of IRF4/MUM1 and BCL6 and lacked PRDM1/BLIMP1 expression and t(14;18)/BCL2 breaks. BCL6 aberrations were common. The gene expression profile of IG/IRF4-positive lymphomas was different from other subtypes of DLBCL and a classifier for IG/IRF4 positivity containing 27 genes allowed prediction of 3 additional MMML IG/IRF4-positive cases subsequently proven by FISH. IG/IRF4-positivity was associated with a favorable outcome likely due to significant enrichment of IG/IRF4-positive lymphomas in childhood and young adulthood. Conclusions: Our results suggest IRF4 translocations to be primary genetic alterations in a novel molecularly defined subset of GC-derived lymphomas predominantly affecting children. 271 diffuse large B-Cell lymphoma samples were hybridized to HGU133A Affymetrix GeneChips.

2011-06-24 | E-GEOD-22470 | biostudies-arrayexpress

Single-cell chromatin accessibility of anti-viral CD4 T cells in Bcl6 and Blimp1 deficient conditions

Project description:Single-cell chromatin accessibility of effector CD4+ T cells WT or Bcl6 Blimp1-deficient was determined by scATACseq after LCMV Armstrong infection

2021-11-05 | GSE149913 | GEO

Dependence on Bcl6 and Blimp1 identifies distinct mechanisms driving memory and follicular helper CD4+ T cell differentiation [scATAC-Seq]

Project description:During the immune response, CD4+ T cells differentiate into distinct effector subtypes, including follicular helper T (Tfh) cells that help B cells, and into memory cells. Tfh and memory cells are required for long-term immunity; both depend on the transcription factor Bcl6, raising the question of whether they differentiate through similar mechanisms. Here, using notably single-cell RNA and ATAC sequencing, we show that virus-responding CD4+ T cells lacking both Bcl6 and Blimp1 can differentiate into cells with transcriptomic, chromatin accessibility and function attributes of memory cells, but not of Tfh cells. Thus, Bcl6 promotes memory cell differentiation primarily through its repression of Blimp1. These findings demonstrate that distinct mechanisms underpin the differentiation of memory and Tfh CD4+ cell and define the Bcl6-Blimp1 axis as a potential target for promoting long-term memory T cell differentiation.

2021-11-14 | GSE184846 | GEO

Dependence on Bcl6 and Blimp1 identifies distinct mechanisms driving memory and follicular helper CD4+ T cell differentiation [scRNA-Seq]

2021-11-14 | GSE184847 | GEO

Translocations Activating IRF4 Identify a Subtype of Germinal-Center-Derived B-cell Lymphoma Affecting Predominantly Children and Young Adults

2011-06-24 | GSE22470 | GEO