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Homo sapiens

ABSTRACT: Identification of KMT2D regulated genes in germinal center B cells

PROVIDER: PRJNA280081 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1949880.fastq.gz	Fastqsanger.gz
	SRR1949881.fastq.gz	Fastqsanger.gz
	SRR1949874.fastq.gz	Fastqsanger.gz
	SRR1949875.fastq.gz	Fastqsanger.gz
	SRR1949876.fastq.gz	Fastqsanger.gz

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Project description:Somatic mutations of the KMT2D methyltransferase gene represent a common genetic lesion in multiple cancer types. In diffuse large B cell lymphoma (DLBCL) and follicular lymphoma (FL), these mutations are highly recurrent and occur early during tumorigenesis, suggesting a central role in transformation. Here we show that FL/DLBCL-associated KMT2D mutations impair its enzymatic activity and lead to diminished global H3K4 methylation in germinal center (GC) B cells and DLBCL, consistent with the enrichment of KMT2D binding at enhancer and promoter regions marked by mono- and tri-methylation. Conditional deletion of Kmt2d early during B cell development, but not after initiation of the GC reaction, leads to an increase in GC B cells, whose transcriptional profile is enriched in cell-cycle regulatory and B-cell receptor signaling genes. Consistently, Kmt2d-deficient B cells exhibit proliferative advantage ex vivo. Loss of Kmt2d combined with BCL2 deregulation, mimicking FL/DLBCL pathogenesis, leads to an increased incidence of clonal lymphoproliferations resembling the features of the human tumors. These findings suggest that early KMT2D loss facilitates lymphomagenesis by remodeling the epigenetic landscape of the cancer precursor cells. Eradication of KMT2D-deficient cells may represent a rational therapeutic approach targeting early tumorigenic events.

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