A minimal T-DNA binary vector was used for Agrobacterium-mediated transfer of a chimeric T4 lysozyme gene located next to the left border, and transgenic potato plants which expressed T4 lysozyme protein were identified and further analysed. Frequent rearrangements of T4 lysozyme transgenes were detected. A vector derivative containing two matrix associated regions (MARs) flanking its multiple cloning site was constructed. In transgenic potato plants, reduced variability in gene expression due to position effects was detected. When either the donor vector contained MAR sequences, or when vector pPCV701 which contains a pBR322 fragment next to the left border were used, only relatively few rearrangements were observed. However, when the T4 lysozyme gene was driven by a CaMV 35S promoter modified by multiplied enhancer region carrying either 2 or 4 elements, frequent rearrangements were again obtained.
Plant Molecular Biology – Springer Journals
Published: Oct 6, 2004
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