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Self-organization and symmetry breaking in intestinal organoid development [bulk RNA-Seq]

ABSTRACT: Self-organization and symmetry breaking in intestinal organoid development [bulk RNA-Seq]

PROVIDER: PRJNA476589 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7358090.fastq.gz	Fastqsanger.gz
	SRR7358100.fastq.gz	Fastqsanger.gz
	SRR7358091.fastq.gz	Fastqsanger.gz
	SRR7358101.fastq.gz	Fastqsanger.gz
	SRR7358092.fastq.gz	Fastqsanger.gz

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Self-organization and symmetry breaking in intestinal organoid development

Project description:Self-organization and symmetry breaking in intestinal organoid development

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Self-organization and symmetry breaking in intestinal organoid development [scRNA-Seq]

Project description:Intestinal organoids are complex three-dimensional structures that mimic cell type composition and tissue organization of the intestine by recapitulating the self-organizing capacity of cell populations derived from a single stem cell. Crucial in this process is a first symmetry-breaking event, in which only a fraction of identical cells in a symmetrical cyst differentiate into Paneth cells, which in turn generates the stem cell niche and leads to asymmetric structures such as crypts and villi. We here combine a quantitative single-cell gene expression and imaging approach to characterize the development of intestinal organoids from a single cell. We show that intestinal organoid development follows a regeneration process driven by transient Yap1 activation. Cell-to-cell variability in Yap1, emerging in symmetrical cysts, initiates a Notch/Dll1 lateral inhibition event driving the symmetry-breaking event and the formation of the first Paneth cell. Our findings reveal how single cells exposed to a uniform growth-promoting environment have the intrinsic ability to generate emergent, self-organized behavior resulting in the formation of complex multicellular asymmetric structures.

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Self-organization and symmetry breaking in intestinal organoid development [scRNA-Seq]

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Controlling organoid symmetry breaking uncovers an excitable system underlying human axial elongation

Project description:The human embryo breaks symmetry to form the anterior-posterior axis of the body. As the embryo elongates along this axis, progenitors in the tailbud give rise to tissues that generate the spinal cord, skeleton, and musculature. This raises the question of how the embryo achieves axial elongation and patterning. While ethics necessitate in vitro studies, the variability of organoid systems has hindered mechanistic insights. Here we developed a bioengineering and machine learning framework that optimizes symmetry breaking by tuning the spatial coupling between human stem cell-derived organoids. This framework enabled the reproducible generation of axially elongating organoids, each possessing a tailbud and neural tube. We discovered that an excitable system composed of WNT/FGF signaling drives elongation through induction of a neuromesodermal progenitor (NMP)-like signaling center. We discovered that instabilities in the excitable system are suppressed by secreted WNT inhibitors. Absence of these inhibitors led to ectopic tailbuds and branches. Our results identify mechanisms governing stable human axial elongation.

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Project description:Axial development of mammals is a dynamic process involving several coordinated morphogenetic events, including axial elongation, somitogenesis, and neural tube formation. To gain insight into the signals control the dynamics of human axial morphogenesis, we generated hundreds of axially elongating organoids by inducing anteroposterior symmetry breaking of spatially coupled epithelial cysts derived from human pluripotent stem cells. Each organoid was composed of a neural tube flanked by presomitic mesoderm sequentially segmented into somites. Periodic activation of the somite differentiation gene MESP2 coincided in space and time with anteriorly traveling segmentation clock waves in the presomitic mesoderm of the organoids, recapitulating critical aspects of somitogenesis. Through timed perturbations of organoids, we demonstrated that FGF and WNT signaling play distinct roles in axial elongation and somitogenesis and that FGF signaling gradients drive the segmentation clock waves. By generating and perturbing organoids that robustly recapitulate the architecture and dynamics of multiple axial tissues in human embryos, this work offers a means to dissect complex mechanisms underlying human embryogenesis.

2022-12-12 | GSE220563 | GEO

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