Loss of CD44 dim Expression from Early Progenitor Cells Marks T-Cell Lineage Commitment in the Human Thymus
Human T-cell development is less well studied than its murine counterpart due to the lack of genetic tools and the difficulty of obtaining cells and tissues. Here, we report the transcriptional landscape of 11 immature, consecutive human T-cell developmental stages. The changes in gene expression of...
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Veröffentlicht in: | Frontiers in immunology 2017, Vol.8, p.32 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Human T-cell development is less well studied than its murine counterpart due to the lack of genetic tools and the difficulty of obtaining cells and tissues. Here, we report the transcriptional landscape of 11 immature, consecutive human T-cell developmental stages. The changes in gene expression of cultured stem cells on OP9-DL1 match those of
isolated murine and human thymocytes. These analyses led us to define evolutionary conserved gene signatures that represent pre- and post-αβ T-cell commitment stages. We found that loss of dim expression of CD44 marks human T-cell commitment in early CD7
CD5
CD45
cells, before the acquisition of CD1a surface expression. The CD44
CD1a
post-committed thymocytes have initiated in frame T-cell receptor rearrangements that are accompanied by loss of capacity to differentiate toward myeloid, B- and NK-lineages, unlike uncommitted CD44
CD1a
thymocytes. Therefore, loss of CD44 represents a previously unrecognized human thymocyte stage that defines the earliest committed T-cell population in the thymus. |
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ISSN: | 1664-3224 1664-3224 |