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Transcriptional profiling of mouse germinal center B cells (B220+, GL7+, CD95+) isolated from GC-specific (Cg1-Cre) DAF-TM transgenic or control mice

ABSTRACT: Transcriptional profiling of mouse germinal center B cells (B220+, GL7+, CD95+) isolated from GC-specific (Cg1-Cre) DAF-TM transgenic or control mice

PROVIDER: PRJNA625050 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR11540617.fastq.gz	Fastqsanger.gz
	SRR11540618.fastq.gz	Fastqsanger.gz
	SRR11540619.fastq.gz	Fastqsanger.gz
	SRR11540620.fastq.gz	Fastqsanger.gz
	SRR11540621.fastq.gz	Fastqsanger.gz

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Transcriptional profiling of mouse germinal center B cells (B220+, GL7+, CD95+) isolated from GC-specific (Cg1-Cre) DAF-TM transgenic or control mice

Project description:Germinal centers (GCs) support diversification and affinity maturation of antibody repertoires through iterative cycles of T-cell-dependent positive selection, B cell clonal expansion and antigen-receptor hypermutation. Positive selection is critical for efficient affinity maturation and depends on only partially understood signaling processes. We show that BCL6-dependent physiological repression of decay accelerating factor (DAF/CD55) on GC B cells is critical for effective positive selection and affinity maturation during GC responses. Absence of DAF on GC B cells lifts restraint on local complement activation, yielding autocrine C3a/C5a-receptor signaling that is indispensable for CD40-dependent mTOR pathway activation during positive selection. Genetic disruption of this pathway causes premature GC collapse and impairs affinity maturation. These results identify previously undiscerned targets to therapeutically manipulate protective and potentially injurious humoral immune responses.

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