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Single-cell genomics reveals the peritoneal B1 cell development pathway and uncovers its BCR repertoire evolution in aging

ABSTRACT: Single-cell genomics reveals the peritoneal B1 cell development pathway and uncovers its BCR repertoire evolution in aging

PROVIDER: PRJEB43088 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR5293900_1.fastq.gz	Fastqsanger.gz
	ERR5293900_2.fastq.gz	Fastqsanger.gz
	ERR5293910_1.fastq.gz	Fastqsanger.gz
	ERR5293910_2.fastq.gz	Fastqsanger.gz
	ERR5293920_1.fastq.gz	Fastqsanger.gz

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Single-cell genomics reveals the peritoneal B1 cell development pathway and uncovers its BCR repertoire evolution in aging

Project description:To understand B1 cell heterogeneity, we sequenced 8.1 weeks old and 64.4 weeks old mice.

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BCR repertoire analysis of wild-type and Cic-null B-1a cells

Project description:Purpose: B-1a cells have a distinct BCR repertoire compared with that of B-2 cells. To examine whether CIC loss affects the BCR repertoire in B-1a cells, we analyzed mRNA sequences of immunoglobulin heavy (Igh) and light (Igk and Igl) chain genes in B-1a cells from 12-week-old control and Cicf/f;Cd19-Cre mice. Methods: Peritoneal cavity B-1a cells (IgM+, CD19+, CD5+, CD43+) were sorted by a MoFlo-XDP (Beckman Coulter). Total RNA was extracted using TRIzol Reagent (GeneAll), according to the manufacturer’s instructions. Long Read iR-Profile Reagent System (iRepertoire) was used to generate NGS libraries covering BCR chains including Igh, Igk, and Igl. Briefly, nested inside and outside primers selectively amplified all V- and C- regions and incorporated communal adaptors. Following clean up, only target amplicons, which contain 5’ and 3’ communal adaptors, were exponentially amplified. Amplified libraries were multiplexed for sequencing on the Illumina Miseq platform. Sequence reads were de-multiplexed according to the barcode sequences. Results: Trimmed reads were mapped to germline V, D and J reference sequences downloaded from the IMGT database. IgH diversity and the usage of variable (V) segments in heavy (Ighv) chain and light (Igkv and Iglv) chain genes were comparable between control and Cic-null B-1a cells. Analysis of non-templated (N)-nucleotide addition at V(D)J junctions revealed that Cic-null B-1a cells have a higher proportion of zero to two N-nucleotides-containing-BCRs than control cells. Conclusions: Our study presents the first comparative BCR repertoire analysis of wild-type and Cic-null B-1a cells. We concluded that CIC deficiency does not dramatically alter the BCR repertoire in B-1a cells.

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Project description:The SARS-CoV-2 pandemic has had a widespread and severe impact on society, yet there have also been instances of remarkable recovery, even in critically ill patients. In this study, we used single-cell RNA sequencing to analyze the immune responses in recovered and deceased COVID-19 patients during moderate and critical stages. The study included three unvaccinated patients from each outcome category. Although expanded T cell receptor (TCR) clones were predominantly SARS-CoV-2-specific, they represented only a small fraction of the total repertoire in all patients. In contrast, while deceased patients exhibited monoclonal B cell receptor (BCR) expansions without COVID-19 specificity, survivors demonstrated diverse and specific BCR clones. These findings suggest that neither TCR diversity nor BCR monoclonal expansions are sufficient for viral clearance and subsequent recovery. Differential gene expression analysis revealed that protein biosynthetic processes were enriched in survivors, but that potentially damaging mitochondrial ATP metabolism was activated in the deceased. This study underscores that BCR repertoire diversity, but not TCR diversity, correlates with favorable outcomes in COVID-19.

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Transcriptional analysis of murine CXCR3+ vs. CXCR3- peritoneal cavity B cells 8 days following infection with Ehrlichia muris.

Project description:We performed bulk RNA sequencing on murine CXCR3+ and CXCR3-negative live singlet IgM+ IgD-neg CD19+ CD138-neg (B1 B cell-like) peritoneal cavity B cells to compare the transcriptomes of the two populations following i.p. infection with the intracellular bacterium Ehrlichia muris. Total RNA was extracted and sequenced, followed by pseudoalignment, quality assessment, normalization, and analysis of differential gene expression. The CXCR3+ B1 B cell-like population was highly enriched for genes involved in proliferation, metabolism, and cell division, whereas the CXCR3- B1 B cell-like population transcriptionally resembled canonical B1 B cells and did not appear to be proliferative. These results suggest local proliferation of CXCR3+ B cells occurs in the peritoneal cavity during acute infection with an intracellular bacterium.

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