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Gene expression of thymic settling progenitors from embryos at E13 compared to E18

ABSTRACT: We used whole genome transcriptome as gene discovery to further understand the differential behaviour of the first (embryonic) and second waves of thymic settling progenitors in the murine embryo.

ORGANISM(S): Mus musculus

PROVIDER: GSE50910 | GEO | 2013/09/17

SECONDARY ACCESSION(S): PRJNA219355

REPOSITORIES: GEO

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Gene expression of thymic settling progenitors from embryos at E13 compared to E18

Project description:We used whole genome transcriptome as gene discovery to further understand the differential behaviour of the first (embryonic) and second waves of thymic settling progenitors in the murine embryo. Mouse embryos at days 13 and 18 of gestation were isolated and the thymic lobes were dissected. Single cell suspension was prepared and treated with biotinilated antibodies to CD3, CD4, CD8, TER119, Gr1, CD25, CD19, NK1.1 and CD11c. Cell suspensions were then incubated with streptavidin Miltenyi Macs beads. Lineage negative thymocytes were recovered in Macs columns. Cell suspensions were then incubated with antibodies against CD135, CD117, CD44, CD24 and Streptavidin bound to PECy7. Lin-, CD117+, CD44+, CD24low, CD135+ cells were then isolated by cell sorting. 3 biological replicates of each sample were isolated with 104-3x104 cells

2013-09-17 | E-GEOD-50910 | biostudies-arrayexpress

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Project description:Human T lymphogenesis includes emergence, migration and thymus-seeding of T lymphoid precursor, followed by T-lymphocytes commitment in thymus, which are largely unknown. Here, we perform single-cell RNA sequencing using cells isolated from human hemogenic/hematopoietic sites such as aorto-gonad-mesonephros (AGM), liver, and thymic primordia spanning embryonic and fetal stages. The transcriptional atlas of thymic primordia illustrates the cellular trajectory of early T-lymphocyte development. Further, thymic seeding progenitors in liver and unique T lymphoid progenitors in AGM at CS14, are first unveiled. We also reveal the stepwise-specification of thymic epithelial cells，and the potential cell-cell interactions between T-lymphocyte progenitors and stromal cells during thymus organogenesis. Our data provide new insights into T lymphogenesis, which prospectively directs the efficient regeneration of T- lymphocytes from pluripotent stem cells

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Project description:T cell development in the thymus is essential for cellular immunity and depends on the organotypic thymic epithelial microenvironment. Compared to other organs, the size and cellular composition of the thymus is unusually dynamic, exemplified by rapid growth and high T cell output during early stages of development, followed by a gradual loss of functional thymic epithelial cells and diminished naïve T cell production with age. Single-cell RNA sequencing (scRNA-seq) has uncovered an unexpected heterogeneity of cell types in the thymic epithelium of young and aged adult mice; however, the identities and developmental dynamics of putative pre- and postnatal epithelial progenitors have remained unresolved. Here, we combine scRNA-seq and a novel CRISPR/Cas9-based cellular barcoding system in mice to determine qualitative and quantitative changes in the thymic epithelium over time. This dual approach enabled us to identify two principal progenitor populations: an early bi-potent progenitor type biased towards cortical epithelium, and a postnatal bi-potent progenitor population biased towards medullary epithelium. We further demonstrate that continuous autocrine provision of Fgf7 leads to sustained expansion of thymic microenvironments without exhausting the epithelial progenitor pools, suggesting a strategy to modulate the extent of thymopoietic activity.

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Project description:We report the identification of immature thymic CD4(-),CD8(-) double-negative (DN)1e cells with the NKT cell lineage potential. We also analyzed the gene expression profiles of DN1e thymocytes compared with those of mature thymic NKT cell developmental stages termed NKT stage-1, 2, and -3, which are characterized by differential expression levels of NK1.1 and CD44 antigens in C57BL/6 mouse strain. Next generation sequencing of total transcriptomes using total RNA isolated from FACS sorted ex vivo thymic DN1eP (Lin-/CD44+/CD25-/CD24low/CD5+/CD27+/Ly108-/CXCR3+) fraction, and mature thymic alphaGalCer-loaded CD1d dimer+TCRbeta+ NKT cell developmental stage-1 (CD44-/NK1.1-), stage-2 (CD44+/NK1.1-), and stage-3 (CD44+/NK1.1+) cells.

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