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BCR repertoire analyis of class-switched and non-switched thymic B cells

ABSTRACT: We report that a large percentage of thymic B cells undergo class switching intrathymically. Thymic B cell class switching requires cognate T-B interaction. To determine whether B cell specificity was also important for thymic B cell class-switching, we sorted class-switched thymic B cells (CD19+B220+IgM-IgD-), unswitched B cells (CD19+B220+IgM+IgD+) and bulk splenic B cells in 3H9 heavy chain-fixed mice and performed high throughput sequencing analysis of the light chain of these populations. Results of this analysis indicated that class-switched thymic B cells have a distinct repertoire compared with unswitched thymic B cells and splenic B cells. Further reactivity tests indicated that a large part of BCRs enriched in class-switched thymic B cells are autoreactive. These data suggest that autoreactive B cells are selected into class-switched population and expanded in the thymus.

ORGANISM(S): Mus musculus

PROVIDER: GSE85366 | GEO | 2016/08/10

SECONDARY ACCESSION(S): PRJNA338285

REPOSITORIES: GEO

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BCR repertoire analyis of class-switched and non-switched thymic B cells

Project description:We report that a large percentage of thymic B cells undergo class switching intrathymically. Thymic B cell class switching requires cognate T-B interaction. To determine whether B cell specificity was also important for thymic B cell class-switching, we sorted class-switched thymic B cells (CD19+B220+IgM-IgD-), unswitched B cells (CD19+B220+IgM+IgD+) and bulk splenic B cells in 3H9 heavy chain-fixed mice and performed high throughput sequencing analysis of the light chain of these populations. Results of this analysis indicated that class-switched thymic B cells have a distinct repertoire compared with unswitched thymic B cells and splenic B cells. Further reactivity tests indicated that a large part of BCRs enriched in class-switched thymic B cells are autoreactive. These data suggest that autoreactive B cells are selected into class-switched population and expanded in the thymus. Light chain repertoire profiles of class-switched thymic B cells, unswithced thymic B cells and splenic B cells from 3H9 mice were generated by deep sequencing.

2016-08-10 | E-GEOD-85366 | biostudies-arrayexpress

Effect of B cell receptor class-switching on lymphoma cells

Project description:Although immunoglobulin class-switching from IgM to IgG enhances B cell receptor (BCR) signalling and antibody responses, certain subsets of B cell lymphomas retain unswitched IgM BCRs despite signs of class-switching in the immunoglobulin heavy chain loci. This suggests that expression of the IgG BCR suppresses progression of specific lymphoma subsets. We found that inducing BCR class switching from IgM to IgG1 or IgG4 inhibits proliferation of B EZB DLBCL lymphoma cell lines. To understand changes associated with class-switching we compared transcritional profiles of isogenic WSU-FSCCL cell lines artificially class-switched to express IgM and IgG BCRs.

2024-05-15 | GSE267440 | GEO

Murine bone marrow immature B cells: autoreactive versus non-autoreactive

Project description:Transcriptional profiling of mouse bone marrow B220+CD23–CD43–IgD– autoreactive immature B cells from 3-83Igi,Rag1-/-,H-2b mice relative to non-autoreactive immature B cells from 3-83Igi,H-2d mice. Goal was to determine genes that potentially mediate negative and positive selection of immature B cells. Biological replicates: 2 autoreactive replicate against, 2 non-autoreactive replicates

2010-08-31 | E-GEOD-22802 | biostudies-arrayexpress

Murine bone marrow immature B cells: autoreactive versus non-autoreactive

2010-08-31 | GSE22802 | GEO

Mus musculus

Project description:BCR repertoire analyis of class-switched and non-switched thymic B cells

| PRJNA338285 | ENA

Shared transcriptional profiles at the single cell level of atypical memory B cells suggest common drivers of expansion and function in malaria, HIV and autoimmune diseases [Malaria VDJ+GEX scRNA-seq]

Project description:Human chronic infectious diseases have been shown to alter the composition and phenotype of the B cell compartment, which, in part, can attribute to failure to acquire protective immunity. However, the extent of such alterations is poorly understood. Here, using a combination of bulk and single cell RNA-sequencing (scRNA-seq) of B cells in individuals living in malaria-endemic Africa, we characterized changes in naïve B cell, classical memory B cell (MBC) and atypical MBC subsets. Of particular interest were unswitched atypical MBCs that expanded in children upon the onset of febrile malaria. This subpopulation expressed IgD but only low levels of IgM (IgD+IgMlo), high levels of the atypical MBC markers, Tbet and CD11c, as well as the intrinsically autoreactive VH4-34. IgD+IgMlo atypical MBCs were distinguished functionally by their acquisition of high antigen-affinity thresholds for activation, suggesting the IgD+IgMlo atypical MBC expansion during febrile malaria may reduce responses to low affinity self-antigens during acute malaria

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Chronic Malaria drives functional heterogenity in B cell subpopilations and expansion of unswitched atypical memory B cells [Malaria scRNA-seq]

2020-09-30 | GSE149728 | GEO

Chronic Malaria drives functional heterogenity in B cell subpopulations and expansion of unswitched atypical memory B cells [Malaria bulkRNA-seq]

2020-09-30 | GSE149727 | GEO

Gene expression profiling of human Ig class switched memory B cells

Project description:We purified 4 Ig class switched memory B cell populations from human adults to compare their gene expression profiles with each other and with those of human naive and IgM memory B cells generated in a previous experiment (E-MEXP-3767).

2015-07-07 | E-MTAB-3637 | biostudies-arrayexpress

Single-cell RNA and BCR sequencing of naive B cells cultured in IgG class-switching polarising conditions

Project description:Naive B cells (CD27-IgD+) were obtained from 3 healthy controls and cultured in vitro under anti-IgM, CD40L and IFN-gamma to polarise class-switching towards IgG isotypes. Single-cell RNA and BCR sequencing libraries were prepared at Day 0 (before addition of stimuli), Day 3 and Day 6 of the cell culture time-course. This is intended as a dataset to validate a new computational method sciCSR in enumerating productive and sterile immunoglobulin transcripts as indicators of B cell class switching and maturation dynamics.

2023-07-01 | E-MTAB-13050 | biostudies-arrayexpress

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