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Volume 17, Number 11, Issue of June 1, 1997 pp. 4159-4169
Copyright ©1997 Society for NeuroscienceCloning and Functional Characterization of Roaz, a Zinc Finger Protein that Interacts with O/E-1 to Regulate Gene Expression: Implications for Olfactory Neuronal Development
Received Jan. 22, 1997; revised March 12, 1997; accepted March 19, 1997.
Robert Y. L. Tsai and Randall R. Reed The Howard Hughes Medical Institute, Department of Molecular Biology and Genetics, and Department of Neuroscience, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
We have identified a protein, Rat O/E-1-associated zinc finger protein (Roaz), that plays a role in regulating the temporal and spatial pattern of olfactory neuronal-specific gene expression. This protein functions by interacting with the olfactory factor O/E-1 and modulating its transcriptional activity. Roaz, isolated via a yeast two-hybrid screen, encoded a protein containing 29 C2H2 zinc fingers of the TFIIIA type. The Roaz mRNA was found in brain, eye, olfactory epithelium, spleen, and heart. In situ hybridization data indicated that Roaz was expressed in the basal layer, consisting of neural precursor cells and immature sensory neurons of the olfactory epithelium, but not in the mature receptor cells. We showed that the Roaz protein bound specifically to O/E-1 by using the yeast two-hybrid system. The two proteins formed a stable complex in coimmunoprecipitation and in vitro binding assays. Introduction of Roaz and O/E-1 into cells containing an olfactory promoter-driven luciferase reporter demonstrated that Roaz abolished O/E-1-mediated transcriptional activation. We propose that the function of Roaz is to modulate negatively the transactivational activity of O/E-1 and to act as a switch protein in the coordination of olfactory sensory neuron differentiation.
Key words: coregulator; sensory neuron; zinc finger; transcription factors; neurodevelopment; olfactory epithelium
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