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An organoid screening framework to engineer intestinal epithelial composition

ABSTRACT: An organoid screening framework to engineer intestinal epithelial composition

PROVIDER: PRJNA624878 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR11539233_1.fastq.gz	Fastqsanger.gz
	SRR11539233_2.fastq.gz	Fastqsanger.gz
	SRR11539234_1.fastq.gz	Fastqsanger.gz
	SRR11539234_2.fastq.gz	Fastqsanger.gz
	SRR11539235_1.fastq.gz	Fastqsanger.gz

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An organoid screening framework to engineer intestinal epithelial composition

Project description:Barrier epithelia are essential to organismal homeostasis, and changes in their cellular composition are observed in human diseases. Within the small intestine, adult stem cells establish tissue cellularity, and may provide a means to control the abundance and quality of specialized epithelial cells. Nevertheless, we lack suitable approaches to identify biological targets and small molecules to modulate them. Here, we develop an extendable framework utilizing a physiologically-inspired organoid model to identify unknown, druggable regulators of intestinal stem cell differentiation that translate to intended manipulations in vivo. Specifically, we miniaturize and adapt an organoid model of Paneth cell differentiation to enable multiplexed phenotypic screening on the scale of thousands of samples, and employ longitudinal single-cell RNA-sequencing to understand hit biology. Strikingly, we identify that inhibitors of the nuclear exporter XPO1 modulate stem cell fate commitment, significantly increasing the abundance of Paneth cells independent of known differentiation cues. Our framework elucidates small molecules which modulate tissue stem cell biology and their underlying targets without the need for a priori knowledge of in vivo pathway biology.

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Project description:The cellular composition of barrier epithelia is essential to organismal homoeostasis. In particular, within the small intestine, adult stem cells establish tissue cellularity, and may provide a means to control the abundance and quality of specialized epithelial cells. Yet, methods for the identification of biological targets regulating epithelial composition and function, and of small molecules modulating them, are lacking. Here we show that druggable biological targets and small-molecule regulators of intestinal stem cell differentiation can be identified via multiplexed phenotypic screening using thousands of miniaturized organoid models of intestinal stem cell differentiation into Paneth cells, and validated via longitudinal single-cell RNA-sequencing. We found that inhibitors of the nuclear exporter Exportin 1 modulate the fate of intestinal stem cells, independently of known differentiation cues, significantly increasing the abundance of Paneth cells in the organoids and in wild-type mice. Physiological organoid models of the differentiation of intestinal stem cells could find broader utility for the screening of biological targets and small molecules that can modulate the composition and function of other barrier epithelia.

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