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Nucleic Acids Research, 2002, Vol. 30, No. 16 e80
© 2002 Oxford University Press

A functional screening assay for the isolation of transcription factors

Christoph Wiesner, Martina Hoeth, Bernd R. Binder and Rainer de Martin*

Department of Vascular Biology and Thrombosis Research, University of Vienna, and BMT—Biomolecular Therapeutics GmbH, Brunnerstraße 59, A-1235 Vienna, Austria

*To whom correspondence should be addressed. Tel: +431 4277 62571; Fax: +431 4277 62550; Email: rainer.de.martin{at}univie.ac.at
The authors wish it to be known that, in their opinion, the first two authors should be regarded as joint First Authors

Transcription factors (TFs) have been difficult to identify by bioinformatics, due to the heterogenous nature of the domains they are composed of. Therefore, we have developed a simple and generally applicable screening system for the identification of transcriptional activators, based on the presence of a functional transactivation domain (TAD). The system utilizes a retroviral vector to express a cDNA library as fusion genes with the yeast gal4 DNA-binding domain. This retroviral library is transduced into a murine NIH3T3-based reporter cell line carrying a stable integrated gal4 promoter–green fluorescent protein reporter gene. cDNA inserts encoding a functional TAD reconstitute a chimeric TF that activates the reporter gene. After fluorescence activated cell sorting (FACS) and expansion of GFP-positive cells, the responsible cDNA inserts are retrieved. From a cDNA library of cytokine-stimulated human umbilical vein endothelial cells (HUVEC), a number of known as well as potentially novel TFs were isolated, demonstrating the suitability of the system. The identification of other factors that are currently not associated with transcriptional regulation suggest additional functions for these proteins. Moreover, our results have focused attention on signaling pathways that have not been recognized previously in the context of endothelial cell biology.


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