Genetics, Vol. 149, 633-639, June 1998, Copyright © 1998

Activation of Latent Transgenes in Arabidopsis Using a Hybrid Transcription Factor

Dave Guyera, Ann Tuttlea, Sabrina Rousea, Sandra Volratha, Marie Johnsona, Sharon Pottera, Jörn Görlacha, Steve Goffa, Lyle Crosslanda, and Eric Warda
a Novartis Agricultural Biotechnology Research, Research Triangle Park, North Carolina 27709

Corresponding author: Eric Ward, Novartis Agricultural Biotechnology Research, 3054 Cornwallis Road, P.O. Box 12257, Research Triangle Park, NC 27709, eric.ward{at}cp.novartis.com (E-mail).

Communicating editor: D. PREUSS

A hybrid transcription factor comprising a fusion of the DNA-binding domain of Saccharomyces cerevisiae GAL4 and the transcription activation domain of maize C1 was expressed in stably transformed Arabidopsis. Additional transgenic lines were created containing test genes controlled by a synthetic promoter consisting of concatemeric copies of the cis-acting site recognized by GAL4 (UASG) fused to a minimal promoter. The GAL4/C1 effector line was crossed to two lines containing a synthetic promoter/GUS fusion. Both histochemical staining and GUS activity assays indicate strong activation of GUS expression was achieved only after crossing. The GAL4/C1 effector line was also crossed to 15 lines containing a synthetic promoter/antisense adenylosuccinate synthetase gene. Severely retarded growth, and in some cases lethality, was observed in 40% of the F1 lines. This system of activation by crossing is generally useful for activating expression of test transgenes.





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