Studies on the effects of a flanking repetitive sequence on the expression of single-copy transgenes in Nicotiana sylvestris and in ... View Full Text


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Article Info

DATE

2003-05

AUTHORS

Christian Kunz, Jarunya Narangajavana, Johannes Jakowitsch, Young-Doo Park, T. René Delon, Ales Kovarik, Blazena Koukalová, Johannes van der Winden, Eduardo Moscone, Werner Aufsatz, M. Florian Mette, Marjori Matzke, Antonius J.M. Matzke

ABSTRACT

To test the influence of a Nicotiana tomentosiformis repetitive sequence (R8.3) on transgene expression in N. sylvestris and in N. sylvestris-N. tomentosiformis hybrids, the R8.3 sequence was placed upstream of a nopaline synthase promoter (NOSpro)-NPTII reporter gene in a T-DNA construct. A number of transgenic N. sylvestris lines were produced and in most, the NPTII gene was expressed. In one line, however, the NPTII gene became silenced and methylated in the NOSpro region. The silenced locus was able to trans-inactivate and induce methylation of two stably expressed transgene loci comprising a similar construct. Nucleotide sequence analyses of the three transgene loci revealed that they each contained a single incomplete copy of the T-DNA, which had sustained deletions of varying sizes in the R8.3 region. Paradoxically, the R8.3 DNA upstream of the two active, unmethylated NOSpro-NPTII genes was highly methylated, whereas the R8.3 DNA upstream of the silenced, methylated NOSpro-NPTII gene was less methylated. The methylated portions of the R8.3 sequence corresponded to retroelement remnants. An active NOSpro-NPTII gene downstream of a nearly intact R8.3 sequence did not become methylated in N. sylvestris-N. tomentosiformis hybrids. Thus, methylation in the R8.3 sequence did not spread into adjoining transgene promoters and the effect of the R8.3 dispersed repeat family on transgene expression was negligible. The silencing phenomena observed with the three single-copy transgene loci are discussed in the context of other possible triggers of silencing. More... »

PAGES

203-215

References to SciGraph publications

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  • Identifiers

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    http://scigraph.springernature.com/pub.10.1023/a:1023937006311

    DOI

    http://dx.doi.org/10.1023/a:1023937006311

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1047175860

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/12825700


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