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In vitro experimental study demonstrates multipotent differentiation of embryonic CD34(+)c-kit(+) cells in mouse aorta-gonad-mesonephros, indicating early multilineage gene coactivation.
Herein, we show that CD34, c-kit double-positive (CD34(+)c-kit(+)) cells from the aorta-gonad-mesonephros (AGM) region of the developing mouse are multipotent in vitro and can undergo both B-lymphoid and multimyeloid differentiation. Molecular analysis of individual CD34(+)c-kit(+) cells by single-cell reverse transcriptase-polymerase chain reaction (RT-PCR) shows coactivation of erythroid (beta-globin) and myeloid (myeloperoxidase [MPO]) but not lymphoid-affiliated (CD3, Thy-1, and lambda5) genes. Additionally, most cells coexpress the stem cell-associated transcriptional regulators AML-1, PU.1, GATA-2 and Lmo2, as well as the granulocyte colony-stimulating factor receptor (G-CSF-R). These results show that the CD34(+)c-kit(+) population from the AGM represents a highly enriched source of multipotent hematopoietic cells, and suggest that limited coactivation of distinct lineage-affiliated genes is an early event in the generation of hematopoietic stem and progenitor cells during ontogeny.
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Delassus et al. (1999) studied this question.
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