Human Gene Set: HOEBEKE_LYMPHOID_STEM_CELL_DN


Standard name HOEBEKE_LYMPHOID_STEM_CELL_DN
Systematic name M7435
Brief description Genes down-regulated in the common lymphoid progenitor (CLP, defined as CD34+CD38-CD7+ [GeneID=947;952;924]) compared to a multipotent cord blood cell (defined as CD34+CD38+CD7-).
Full description or abstract Hematopoietic stem cells in the bone marrow (BM) give rise to all blood cells. According to the classic model of hematopoiesis, the differentiation paths leading to the myeloid and lymphoid lineages segregate early. A candidate 'common lymphoid progenitor' (CLP) has been isolated from CD34(+)CD38(-) human cord blood cells based on CD7 expression. Here, we confirm the B- and NK-differentiation potential of CD34(+)CD38(-)CD7(+) cells and show in addition that this population has strong capacity to differentiate into T cells. As CD34(+)CD38(-)CD7(+) cells are virtually devoid of myeloid differentiation potential, these cells represent true CLPs. To unravel the molecular mechanisms underlying lymphoid commitment, we performed genome-wide gene expression profiling on sorted CD34(+)CD38(-)CD7(+) and CD34(+)CD38(-)CD7(-) cells. Interestingly, lymphoid-affiliated genes were mainly upregulated in the CD7(+) population, while myeloid-specific genes were downregulated. This supports the hypothesis that lineage commitment is accompanied by the shutdown of inappropriate gene expression and the upregulation of lineage-specific genes. In addition, we identified several highly expressed genes that have not been described in hematopoiesis before.
Collection C2: Curated
      CGP: Chemical and Genetic Perturbations
Source publication Pubmed 17170726   Authors: Hoebeke I,De Smedt M,Stolz F,Pike-Overzet K,Staal FJ,Plum J,Leclercq G
Exact source Table 1S
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Source species Homo sapiens
Contributed by Arthur Liberzon (MSigDB Team)
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identifier namespace		 AFFY_HG_U133
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Version history 3.0: First introduced

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