| First Author | Sumner R | Year | 2000 |
| Journal | Oncogene | Volume | 19 |
| Issue | 30 | Pages | 3335-42 |
| PubMed ID | 10918590 | Mgi Jnum | J:63787 |
| Mgi Id | MGI:1861575 | Doi | 10.1038/sj.onc.1203660 |
| Citation | Sumner R, et al. (2000) Initiation of adult myelopoiesis can occur in the absence of c-Myb whereas subsequent development is strictly dependent on the transcription factor. Oncogene 19(30):3335-42 |
| abstractText | 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. By 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 stage. 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 megakaryocytes in the c-myb(-/-) foetal liver also refute early suggestions that megakaryopoiesis is unaffected by the absence of c-Myb. |
