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Identification of mesenchymal progenitors in the early limb bud

ABSTRACT: Identification of mesenchymal progenitors in the early limb bud

PROVIDER: PRJNA477311 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7406040.fastq.gz	Fastqsanger.gz
	SRR7406041.fastq.gz	Fastqsanger.gz
	SRR7406042.fastq.gz	Fastqsanger.gz
	SRR7406043.fastq.gz	Fastqsanger.gz
	SRR7406044.fastq.gz	Fastqsanger.gz

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Identification of mesenchymal progenitors in the early limb bud

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Direct Reprogramming of Non-limb Fibroblasts to Cells with Properties of Limb Progenitors [scRNA-seq]

Project description:The early limb bud consists of mesenchymal progenitors (limb progenitors) derived from the lateral plate mesoderm (LPM) that produce most of the tissues of the mature limb bud. The LPM also gives rise to the mesodermal components of the trunk, flank and neck. However, the mesenchymal cells generated at these other axial levels cannot produce the variety of cell types found in the limb bud, nor can they be directed to form a patterned appendage-like structure, even when placed in the context of the signals responsible for organizing the limb bud. Here, by taking advantage of a direct reprogramming approach, we find a set of factors (Prdm16, Zbtb16, and Lin28) normally expressed in the early limb bud, that are capable of imparting limb progenitor-like properties to non-limb fibroblasts. Cells reprogrammed by these factors show similar gene expression profiles, and can differentiate into similar cell types, as endogenous limb progenitors. The further addition of Lin41 potentiates proliferation of the reprogrammed cells while suppressing differentiation. These results suggest that these same four key factors may play pivotal roles in the specification of endogenous limb progenitors.

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Project description:Shh signal mediated by Gli family of transcription factors regulates digit growth and patterning in early limb development. Shh expression in the posterior margin of the limb bud defines the zone of polarizing activity. However, much less is know about downstream targets that mediate Shh signal functions. In this dataset, we include the expression data obtained from dissected anterior and posterior halves of mouse limb bud respectively. These data are used to obtain 889 transcripts that were upregulated 1.3 fold or more in the posterior limb bud, and 1189 transcripts that were enriched in the anterior limb bud at 1.3 fold or more. Two samples were analyzed. We generate pairwise comparisons between anterior and posterior limb tissues. Genes with a fold-change ≥1.3 were selected.

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Project description:Here, we introduce a novel chemically induced dedifferentiation approach that reverses the cellular development from a differentiated state to progenitor state, conferring the generation of limb bud progenitors from human adult mesenchymal stromal cells and dermal fibroblasts. These chemically induced limb bud cells (hCiLB cells) show a high degree of transcriptomic similarity to human embryonic limb bud cells. We found that hCiLB cells can undergo extensive expansion, while maintaining population homogeneity and long-term self-renewal capacity. Moreover, hCiLB cells exhibit increased osteochondrogenic differentiation ability than their parental cells, providing a new platform for the development of authentic articular cartilage. These results also highlight a potential therapeutic approach for the repair of damaged human tissues through reversal of developmental pathways from mature cells to expandable progenitor cells.

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Project description:Here, we introduce a novel chemically induced dedifferentiation approach that reverses the cellular development from a differentiated state to progenitor state with reduced senescence features, conferring the generation of limb bud progenitors from human adult mesenchymal stromal cells and dermal fibroblasts. These chemically induced limb bud cells (hCiLB cells) show a high degree of transcriptomic similarity to human embryonic limb bud cells. We found that hCiLB cells can undergo extensive expansion, while maintaining population homogeneity and long-term self-renewal capacity. Moreover, hCiLB cells exhibit increased osteochondrogenic differentiation ability than their parental cells, providing a new platform for the development of authentic articular cartilage. These results also highlight a potential therapeutic approach for the repair of damaged human tissues through reversal of developmental pathways from mature cells to expandable progenitor cells.

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