Journal
ONCOGENE
Volume 19, Issue 30, Pages 3335-3342Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.onc.1203660
Keywords
c-Myb; knockout; definitive haemopoiesis; megakaryocytes; foetal liver
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The c-Myb transcriptional regulator is crucial to the development and functioning of haemopoietic cells, so much so that mouse embryos homozygous for an inactivated c-myb allele die from anaemia at about day 15 of gestation. BS analysing c-myb(-/-) chimaeras we show that no mature cells of any lymphoid or myeloid lineage can be detected in adult haemopoietic tissues. This demonstrates that the effects of c-myb ablation on haemopoiesis are cell autonomous and correlates with an absence in the c-myb(-/-) foetal liver of uni- and multilineage CFUs. Indeed, CFU assays performed on E8.5 yolk sac cells revealed that haemopoietic progenitors are already defective at this st-age. However, although cells expressing high levels of c-Kit were absent, we could detect a high proportion of CD34(+) CD45(+) cells in the c-myb(-/-) foetal liver. Examination of chimaeric embryos revealed that c-myb(-/-) donor-derived CD34(+)/Kit(+) cells, representing committed definitive progenitors, initially populated the foetal liver, but are unable to expand like wild type progenitors. Our results showing no megakaryocytic CFUs and a reduction in the absolute numbers of megakargocytes in the c-myb(-/-) foetal liver also refute early suggestions that megakaryopoiesis is unaffected by the absence of c-Myb.
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