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A new technique for activation tagging in Arabidopsis.

Gene 2008 May 16
We have created and applied to Arabidopsis thaliana a new system of two vectors. The first vector (pEnLox) is intended for activation tagging and contains a multimerized transcriptional enhancer from the cauliflower mosaic virus (CaMV) 35S gene in T-DNA flanked by two loxP-sites and the second vector (pCre) contains the cre gene. Using pEnLox we have generated more than a hundred mutants resistant to the herbicide ammonium glufosinate, and about ten helper-lines resistant to the antibiotic hygromycin obtained with the use of pCre vector and also more than ten double mutants resistant to both selective markers. In at least 3 cases among 40 mutant lines that have been analyzed we observed constitutive ectopic expression of the genes adjacent to the T-DNA insertion that causes development of the mutant phenotype. Also, reversion of the mutants to the wild-type phenotype after removing the CaMV enhancer has been demonstrated. The system presented here provides a new and easier way to analyze A. thaliana gain-of-function mutants.

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