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Single-cell RNA-sequencing of mouse double-negative developing thymocytes

ABSTRACT: Single-cell RNA-sequencing of mouse double-negative developing thymocytes

PROVIDER: PRJNA485118 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7659080.fastq.gz	Fastqsanger.gz
	SRR7659073.fastq.gz	Fastqsanger.gz
	SRR7659074.fastq.gz	Fastqsanger.gz
	SRR7659075.fastq.gz	Fastqsanger.gz
	SRR7659076.fastq.gz	Fastqsanger.gz

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Development of Double-positive Thymocytes at Single-cell Resolution

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Project description:We applied single-cell sequencing to mouse thymocytes and analyzed the transcriptome data using Seurat. By applying unsupervised clustering, we defined thymocyte subtypes and validated DP cell subtypes by flow cytometry. We classified the cell cycle phases of each cell according to expression of cell cycle phase-specific genes. For immune synapse detection, we used immunofluorescent staining and ImageStream-based flow cytometry. We studied and integrated human thymocyte data to verify the conservation of our findings and also performed cross-species comparisons to examine species-specific gene regulation. We classified blast, rearrangement and selection subtypes of DP thymocytes and used the surface markers CD2 and Ly6d to identify these subtypes by flow cytometry. Based on this new classification, we found that the proliferation of blast DP cells is quite different from that of double-positive cells and other cell types, which tend to exit the cell cycle after a single round. At the DP cell selection stage, we observed that CD8-associated immune synapses formed between thymocytes, indicating that CD8sp selection occurred among thymocytes themselves. Moreover, cross-species comparison revealed species-specific transcription factors (TFs) that contribute to the transcriptional differences of thymocytes from humans and mice. Our study classified DP thymocyte subtypes of different developmental stages and provided new insight into the development of DP thymocytes at single-cell resolution, furthering our knowledge of the fundamental immunological process of thymopoiesis.

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