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• W2051542027 abstract "ObjectiveStudy the effect of loss of expression of Pitx2, a homeodomain gene preferentially expressed in murine hematopoietic stem/progenitor cells, on hematopoietic stem cells (HSCs).MethodsWe examined the fetal livers of mouse embryos with homozygous disruption of the Pitx2 gene, using flow cytometry immunophenotyping analysis, as well as immunohistochemistry techniques. We further investigated the role of Pitx2 in HSCs using a chimeric mouse model system. Pitx2 null embryonic stem (ES) cell clones were generated from embryonic day 3.5 blastocysts of Pitx2 null embryos. The Pitx2 null donor ES cell contribution to the adult hematopoietic system was confirmed by identifying donor-specific glucose-phosphate isomerase isotype in the erythrocytes using cellulose acetate eletrophoresis, and by demonstrating donor-specific major histocompatibility complex antigen allotype on the granulocytes/monocytes and T and B lymphocytes of the chimeric mice using flow cytometry analysis.ResultsPitx2 homozygous null fetal livers are decreased in size and overall cellularity. The erythroid cell component of these livers is further reduced as compared to that of their wild-type and heterozygous littermates. Detailed quantitative analysis of the chimeric mice revealed contribution of Pitx2 null ES cells to erythroid, myeloid, lymphoid, and megakaryocytic lineages. The quantitative level of ES cell contribution to the peripheral hematopoietic cells was proportional to the level of general chimerism as determined by coat color.ConclusionAlthough the fetal livers of Pitx2 null embryos displayed signs of impaired erythropoiesis, Pitx2 gene disrupted HSCs can contribute to hematopoiesis under physiological conditions. Study the effect of loss of expression of Pitx2, a homeodomain gene preferentially expressed in murine hematopoietic stem/progenitor cells, on hematopoietic stem cells (HSCs). We examined the fetal livers of mouse embryos with homozygous disruption of the Pitx2 gene, using flow cytometry immunophenotyping analysis, as well as immunohistochemistry techniques. We further investigated the role of Pitx2 in HSCs using a chimeric mouse model system. Pitx2 null embryonic stem (ES) cell clones were generated from embryonic day 3.5 blastocysts of Pitx2 null embryos. The Pitx2 null donor ES cell contribution to the adult hematopoietic system was confirmed by identifying donor-specific glucose-phosphate isomerase isotype in the erythrocytes using cellulose acetate eletrophoresis, and by demonstrating donor-specific major histocompatibility complex antigen allotype on the granulocytes/monocytes and T and B lymphocytes of the chimeric mice using flow cytometry analysis. Pitx2 homozygous null fetal livers are decreased in size and overall cellularity. The erythroid cell component of these livers is further reduced as compared to that of their wild-type and heterozygous littermates. Detailed quantitative analysis of the chimeric mice revealed contribution of Pitx2 null ES cells to erythroid, myeloid, lymphoid, and megakaryocytic lineages. The quantitative level of ES cell contribution to the peripheral hematopoietic cells was proportional to the level of general chimerism as determined by coat color. Although the fetal livers of Pitx2 null embryos displayed signs of impaired erythropoiesis, Pitx2 gene disrupted HSCs can contribute to hematopoiesis under physiological conditions." @default.
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• W2051542027 date "2006-02-01" @default.
• W2051542027 modified "2023-10-17" @default.
• W2051542027 title "Hematopoiesis following disruption of the Pitx2 homeodomain gene" @default.
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• W2051542027 doi "https://doi.org/10.1016/j.exphem.2005.11.002" @default.
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