Abstract:
:The family of core-binding factors includes the DNA-binding subunits Runx1-3 and their common non-DNA-binding partner CBFbeta. We examined the collective role of core-binding factors in hematopoiesis with a hypomorphic Cbfb allelic series. Reducing CBFbeta levels by 3- or 6-fold caused abnormalities in bone development, megakaryocytes, granulocytes, and T cells. T-cell development was very sensitive to an incremental reduction of CBFbeta levels: mature thymocytes were decreased in number upon a 3-fold reduction in CBFbeta levels, and were virtually absent when CBFbeta levels were 6-fold lower. Partially penetrant consecutive differentiation blocks were found among early T-lineage progenitors within the CD4- CD8- double-negative 1 and downstream double-negative 2 thymocyte subsets. Our data define a critical CBFbeta threshold for normal T-cell development, and situate an essential role for core-binding factors during the earliest stages of T-cell development.
journal_name
Bloodjournal_title
Bloodauthors
Talebian L,Li Z,Guo Y,Gaudet J,Speck ME,Sugiyama D,Kaur P,Pear WS,Maillard I,Speck NAdoi
10.1182/blood-2006-05-021188subject
Has Abstractpub_date
2007-01-01 00:00:00pages
11-21issue
1eissn
0006-4971issn
1528-0020pii
blood-2006-05-021188journal_volume
109pub_type
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