A human postnatal lymphoid progenitor capable of circulating and seeding the thymus |
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Authors: | Six Emmanuelle M Bonhomme Delphine Monteiro Marta Beldjord Kheira Jurkowska Monika Cordier-Garcia Corinne Garrigue Alexandrine Dal Cortivo Liliane Rocha Benedita Fischer Alain Cavazzana-Calvo Marina André-Schmutz Isabelle |
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Affiliation: | Emmanuelle M. Six, Delphine Bonhomme, Marta Monteiro, Kheira Beldjord, Monika Jurkowska, Corinne Cordier-Garcia, Alexandrine Garrigue, Liliane Dal Cortivo, Benedita Rocha, Alain Fischer, Marina Cavazzana-Calvo, and Isabelle André-Schmutz |
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Abstract: | Identification of a thymus-seeding progenitor originating from human bone marrow (BM) constitutes a key milestone in understanding the mechanisms of T cell development and provides new potential for correcting T cell deficiencies. We report the characterization of a novel lymphoid-restricted subset, which is part of the lineage-negative CD34+CD10+ progenitor population and which is distinct from B cell–committed precursors (in view of the absence of CD24 expression). We demonstrate that these Lin−CD34+CD10+CD24− progenitors have a very low myeloid potential but can generate B, T, and natural killer lymphocytes and coexpress recombination activating gene 1, terminal deoxynucleotide transferase, PAX5, interleukin 7 receptor α, and CD3ε. These progenitors are present in the cord blood and in the BM but can also be found in the blood throughout life. Moreover, they belong to the most immature thymocyte population. Collectively, these findings unravel the existence of a postnatal lymphoid-polarized population that is capable of migrating from the BM to the thymus. |
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