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A cell atlas of human thymic development defines T cell repertoire formation

ABSTRACT: A cell atlas of human thymic development defines T cell repertoire formation

PROVIDER: PRJEB36131 | ENA |

REPOSITORIES: ENA

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A cell atlas of human thymic development defines T cell repertoire formation

Project description:We performed single-cell RNA-sequencing to create a cell census of the human thymus during development, early childhood and adult life. We sampled 15 embryonic and fetal thymi spanning thymic developmental stages between 7 post-conception weeks (PCW) to 17 PCW, and 9 postnatal thymi from paediatric and adult samples. We compared the cellular composition and T cell differentiation within human and mouse thymus using newly generated and repository mouse datasets. Finally, we investigated the bias in the recombination and selection of human versus mouse TCR repertoires.

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A cell atlas of human thymic development defines T cell repertoire formation.

Project description:The thymus provides a nurturing environment for the differentiation and selection of T cells, a process orchestrated by their interaction with multiple thymic cell types. We used single-cell RNA sequencing to create a cell census of the human thymus across the life span and to reconstruct T cell differentiation trajectories and T cell receptor (TCR) recombination kinetics. Using this approach, we identified and located in situ CD8αα+ T cell populations, thymic fibroblast subtypes, and activated dendritic cell states. In addition, we reveal a bias in TCR recombination and selection, which is attributed to genomic position and the kinetics of lineage commitment. Taken together, our data provide a comprehensive atlas of the human thymus across the life span with new insights into human T cell development.

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