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Abstract
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Tissue-Specific Expression of as-1 in Transgenic Tobacco.

G. Neuhaus, G. Neuhaus-Url, F. Katagiri, K. Seipel, N. H. Chua
G. Neuhaus
Institute for Plant Sciences, Eidgenossische Technische Hochschule-Zurich, Zurich, Switzerland.
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G. Neuhaus-Url
Institute for Plant Sciences, Eidgenossische Technische Hochschule-Zurich, Zurich, Switzerland.
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F. Katagiri
Institute for Plant Sciences, Eidgenossische Technische Hochschule-Zurich, Zurich, Switzerland.
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K. Seipel
Institute for Plant Sciences, Eidgenossische Technische Hochschule-Zurich, Zurich, Switzerland.
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N. H. Chua
Institute for Plant Sciences, Eidgenossische Technische Hochschule-Zurich, Zurich, Switzerland.
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Published June 1994. DOI: https://doi.org/10.1105/tpc.6.6.827

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Abstract

When integrated as a transgene in one or a few copies, the -90 35S promoter of cauliflower mosaic virus confers expression in roots with little or no expression in cotyledons and leaves. The responsible cis element, activation sequence-1 (as-1), can bind to the nuclear factor ASF-1 as well as to the transcription factor TGA1a. Here, we show that microinjection of 104 molecules of TGA1a per cotyledon cell activated transgenes containing as-1-linked promoters. Transgenes with promoters linked to the octopine synthase (ocs) element, which also binds TGA1a, responded similarly. The acidic, N-terminal segment of TGA1a is important for transcription activation in vivo because a deletion mutant without the first 80 amino acids was inactive. Finally, we show that the -90 35S-[beta]-glucuronidase (GUS) fusion gene conferred GUS expression in cotyledon cells when injected at 50,000 copies per cell. Collectively, these results provide support for the hypothesis that the undetectable expression of the as-1-linked transgene in cotyledon cells is most likely a result of its inability to compete for a limiting amount of its cognate transcription factor(s), presumably TGA1a or related proteins.

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Tissue-Specific Expression of as-1 in Transgenic Tobacco.
G. Neuhaus, G. Neuhaus-Url, F. Katagiri, K. Seipel, N. H. Chua
The Plant Cell Jun 1994, 6 (6) 827-834; DOI: 10.1105/tpc.6.6.827

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Tissue-Specific Expression of as-1 in Transgenic Tobacco.
G. Neuhaus, G. Neuhaus-Url, F. Katagiri, K. Seipel, N. H. Chua
The Plant Cell Jun 1994, 6 (6) 827-834; DOI: 10.1105/tpc.6.6.827
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The Plant Cell
Vol. 6, Issue 6
Jun 1994
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