Initiation of adult myelopoiesis can occur in the absence of c-Myb whereas subsequent development is strictly dependent on the transcription factor.

Abstract:

: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.

journal_name

Oncogene

journal_title

Oncogene

authors

Sumner R,Crawford A,Mucenski M,Frampton J

doi

10.1038/sj.onc.1203660

subject

Has Abstract

pub_date

2000-07-13 00:00:00

pages

3335-42

issue

30

eissn

0950-9232

issn

1476-5594

journal_volume

19

pub_type

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