Human Gene Set: LIU_TARGETS_OF_VMYB_VS_CMYB_UP


Standard name LIU_TARGETS_OF_VMYB_VS_CMYB_UP
Systematic name M3389
Brief description Genes regulated in the opposite directions by v-MYB (UP) and c-MYB (DN) variants of CMYB [GeneID=4602] overexpressed in primary monocyte cultures off adenoviral vectors.
Full description or abstract The v-Myb oncoprotein encoded by Avian Myeloblastosis Virus is highly oncogenic, induces leukemias in chickens and mice and transforms immature hematopoietic cells in vitro. The v-Myb protein is a mutated and truncated version of c-Myb, a DNA-binding transcription factor expressed in many cell types that is essential for normal hematopoiesis. Previous studies suggested that two types of differences, DNA binding domain mutations and the deletion of a C-terminal negative regulatory domain were important for increasing the transforming activity of v-Myb. Here, we combined structure-function studies of the v-Myb and c-Myb proteins with unbiased microarray-based transcription assays to compare the transcriptional specificities of the two proteins. In human cells, the v-Myb and c-Myb proteins displayed strikingly different activities and regulated overlapping, but largely distinct sets of target genes. Each type of mutation that distinguished v-Myb from c-Myb, including the N- and C-terminal deletions, DNA binding domain changes and mutations in the transcriptional activation domain, affected different sets of target genes and contributed to the different activities of c-Myb and v-Myb. The results suggest that v-Myb is not just a de-repressed version of c-Myb. Instead, it is a distinct transcriptional regulator with a unique set of activities.
Collection C2: Curated
      CGP: Chemical and Genetic Perturbations
Source publication Pubmed 16205643   Authors: Liu F,Lei W,O'Rourke JP,Ness SA
Exact source Table 4S: Heat Map Order 1-27
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Source species Homo sapiens
Contributed by Arthur Liberzon (MSigDB Team)
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identifier namespace		 AFFY_HG_U133
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Version history 3.0: First introduced

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