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pubmed-article:11434458pubmed:abstractTextWe investigated physical distances and directions of transposition of the maize transposable element Ac in tobacco cultured cells. We introduced a T-DNA construct that carried a non-autonomous derivative of Ac (designated dAc-I-RS) that included sites for cleavage by restriction endonuclease MluI. Another cleavage site was also introduced into the T-DNA region outside of the dAc-I-RS transposable element. The tobacco cultured cell line BY-2 was transformed with the T-DNA and several transformed lines that had a single copy of the T-DNA at a different chromosomal location were isolated. These lines were co-cultured with Agrobacterium tumefaciens cells that carried a cDNA for the Ac transposase gene under the control of various promoters. Sublines of cultured cells in which dAc-I-RS had been transposed, were isolated. The genomic DNAs of these sublines were isolated and digested with MluI. Sizes of DNA segments generated by digestion were determined by pulse-field gel electrophoresis. Our results showed that 20 to 70% of transposition events had occurred within several hundreds kilo-base pairs (kb) on the same chromosome. These results demonstrate that the Ac-Ds element preferentially transposed to regions near the original site in a tobacco chromosome. In addition, the present results are an example of asymmetric transposition as demonstrated by the distance of transposition on the chromosome.lld:pubmed
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pubmed-article:11434458pubmed:pagination131-9lld:pubmed
pubmed-article:11434458pubmed:dateRevised2011-11-17lld:pubmed
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pubmed-article:11434458pubmed:year2001lld:pubmed
pubmed-article:11434458pubmed:articleTitleThe transposition pattern of the Ac element in tobacco cultured cells.lld:pubmed
pubmed-article:11434458pubmed:affiliationDivision of Biological Science, Graduate School of Science, Nagoya University, Japan.lld:pubmed
pubmed-article:11434458pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11434458pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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