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Expression of the tobacco Tnt1 retrotransposon promoter in heterologous species

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Abstract

The expression of the tobacco (Nicotiana tabacum) retrotransposon Tntl has previously been shown to be strongly regulated and driven from the 5′ long terminal repeat (LTR). We report here that the Tntl LTR can promote activity of the β-glucuronidase (GUS) reporter gene in two heterologous species of the Brassicaceae family, namely rapessed (Brassica napus) and Arabidopsis thaliana. The translational LTR-GUS fusion was active in transient expression studies performed with tobacco and rapeseed protoplasts, indicating that the LTR sequences are recognized in heterologous species. Our results also showed that Tntl LTR-promoted GUS expression in transgenic Arabidopsis is strongly regulated, and that, in contrast to tobacco, hormonal activation plays a significant role in the expression of the Tntl LTR in Arabidopsis. LTR sequences were shown to be more effective than the CaMV 35S enhancer region in transient expression studies performed with tobacco or rapessed protoplasts; and substitution of the LTR sequences upstream from the major transcriptional start with the CaMV 35S enhancer region gave high levels of expression in transgenic tobacco and Arabidopsis leaves, suggesting that a Tntl element with similar substitutions in its 5′ LTR might be suited for gene-tagging experiments in heterologous species.

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Author notes

  1. Peter K. Pauls

    Present address: Department of Crop Science, University of Guelph, N1G2WI, Guelph, Ontario, Canada

  2. Karl Kunert

    Present address: Research Development Department, AECI Limited, P.O., 1645, Modderfontein, South Africa

  3. Eric Huttner

    Present address: Biosem Pacific, Research school of Biological sciences, The Australian National University, GPO Box 475, 2601, Canberra, ACT, Australia

Authors and Affiliations

  1. Laboratoire de Biologie Cellulaire, INRA-Versailles, F-78026, Versailles Cédex, France

    Peter K. Pauls, Karl Kunert, Eric Huttner & Marie-Angèle Grandbastien

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  1. Peter K. Pauls
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  2. Karl Kunert
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  3. Eric Huttner
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  4. Marie-Angèle Grandbastien
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Pauls, P.K., Kunert, K., Huttner, E. et al. Expression of the tobacco Tnt1 retrotransposon promoter in heterologous species. Plant Mol Biol 26, 393–402 (1994). https://doi.org/10.1007/BF00039548

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  • DOI: https://doi.org/10.1007/BF00039548

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