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The Ets family of transcription factors characterized by an evolutionarily-conserved DNA-binding domain regulates expression of a variety of viral and cellular genes by binding to a purine-rich GGAA/T core sequence in cooperation with other transcriptional factors and co-factors. Most Ets family proteins are nuclear targets for activation of Ras-MAP kinase signaling pathway and some of them affect...
The Wilms' tumor gene Wt1 encodes a zinc finger protein, which is required for normal formation of the genitourinary system and mesothelial tissues. Our recent findings indicate that Wt1 also plays a critical role in the development of ganglion cells in the vertebrate retina. Here we show that the POU-domain factor Pou4f2 (formerly Brn-3b), which is necessary for retinal ganglion cell survival, is...
Skeletal muscle differentiation has been shown to be dependent on the expression of Rb and p300. We recently cloned a novel inhibitor of muscle differentiation called EID-1, which interacted with both of these factors. In a database search for related molecules, we have cloned and characterized a new EID-1 family member, EID-2. This 28-kDa protein encodes a 236-amino-acid protein with significant...
Here we describe the cloning and characterization of a novel murine gene named m4mbt that encodes a homolog of the lethal (3) malignant brain tumor (l(3)mbt) and Scm proteins. It is localized on mouse chromosome 15E2 and is organized into 17 exons. As demonstrated by Northern blot analysis, m4mbt mRNA is expressed in virtually all tested tissues and cell lines with the exception of stomach and muscle...
Using avian B lymphoma-derived DT40 cells, we disrupted a gene encoding the transcription factor PU.1. The mutant mRNA codes for a protein incapable of functioning as a transcription factor because of the deletion of the protein's DNA-binding domain. The absence of a functional PU.1 protein in the mutant cells was confirmed by Western blotting and electrophoretic mobility shift assay, thereby demonstrating...
Granulocytic differentiation of myeloid NB4 cells was noted to transactivate the genomic human growth hormone (hGH) reporter construct in the absence of a driving test promoter. Such spurious hGH transactivation also occurred upon co-transfection of plasmids expressing the transactivators c-Myb and C/EBPα into undifferentiated NB4 cells. Modifications to the reporter gene and the vector resulted...
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