Abstract:
:BCL11 genes play crucial roles in lymphopoiesis and have been associated with hematopoietic malignancies. Specifically, disruption of the BCL11B (B-cell chronic lymphocytic leukemia/lymphoma 11B) locus is linked to T-cell acute lymphoblastic leukemia, and the loss of heterozygosity in mice results in T-cell lymphoma. BCL11 proteins are related C2H2 zinc-finger transcription factors that act as transcriptional repressors. Here, we demonstrate the association of the endogenous BCL11B with the nucleosome remodeling and histone deacetylase (NuRD) complex, one of the major transcriptional corepressor complexes in mammalian cells. BCL11B complexes from T lymphocytes possess trichostatin A-sensitive histone deacetylase activity, confirming the functionality of the complexes. Analysis of the BCL11B-NuRD association demonstrated that BCL11B directly interacted with the metastasis-associated proteins MTA1 and MTA2 through the amino-terminal region. We provide evidence for the functional requirement of MTA1 in transcriptional repression mediated by BCL11B through the following: (1) overexpression of MTA1 enhanced the transcriptional repression mediated by BCL11B, (2) knockdown of MTA1 expression by small interfering RNA inhibited BCL11B transcriptional repression activity and (3) MTA1 was specifically recruited to a BCL11B targeted promoter. Taken together, these data support the hypothesis that the NuRD complex mediates transcriptional repression function of BCL11B.
journal_name
Oncogenejournal_title
Oncogeneauthors
Cismasiu VB,Adamo K,Gecewicz J,Duque J,Lin Q,Avram Ddoi
10.1038/sj.onc.1208904subject
Has Abstractpub_date
2005-10-13 00:00:00pages
6753-64issue
45eissn
0950-9232issn
1476-5594pii
1208904journal_volume
24pub_type
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