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Mouse prostate organoid metabolism

ABSTRACT: Mouse prostate organoid metabolism

PROVIDER: PRJNA912592 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR22746500.fastq.gz	Fastqsanger.gz
	SRR22746501.fastq.gz	Fastqsanger.gz
	SRR22746502.fastq.gz	Fastqsanger.gz
	SRR22746503.fastq.gz	Fastqsanger.gz
	SRR22746504.fastq.gz	Fastqsanger.gz

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Genomic analyses of primary mouse prostate organoid culture with overexpression of FOXA1

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Genomic analyses of primary mouse prostate organoid culture with overexpression of FOXA1

Project description:Mutations in the FOXA1 transcription factor define a unique subset of prostate cancers but the functional consequences of these mutations and whether they confer gain or loss of function is unknown. By annotating the FOXA1 mutation landscape from 3086 human prostate cancers, we define two hotspots in the forkhead domain: Wing2 (~50% of all mutations) and R219 (~5%), a highly conserved DNA contact residue. Clinically, Wing2 mutations are seen in adenocarcinomas at all stages, whereas R219 mutations are enriched in metastatic tumors with neuroendocrine histology. Interrogation of the biologic properties of FOXA1WT and 14 FOXA1 mutants revealed gain-of-function in mouse prostate organoid proliferation assays. ATAC-seq of FOXA1WT and representative Wing2 and R219 mutants revealed dramatic, mutant-specific changes in open chromatin at thousands of genomic loci, together with novel sites of FOXA1 binding and associated increases in gene expression. Of note, peaks in R219 mutant expressing cells lack the canonical core FOXA1 binding motifs (GTAAAC/T) but are enriched for a related motif (GTAAAG/A), which is preferentially activated by R219 mutant FOXA1 in reporter assays. Thus, FOXA1 mutations alter its normal pioneering function and promote oncogenesis through perturbation of normal luminal epithelial differentiation programs, providing further support to the role of lineage plasticity in cancer progression.

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