Intermolecular homologous recombination in plants - PubMed (original) (raw)
Intermolecular homologous recombination in plants
M Baur et al. Mol Cell Biol. 1990 Feb.
Abstract
To study DNA topological requirements for homologous recombination in plants, we have constructed pairs of plasmids that contain nonoverlapping deletions in the neomycin phosphotransferase gene [APH(3')II], which, when intact, confers kanamycin resistance to plant cells. Protoplasts isolated from Nicotiana tabacum were cotransformed with complementary pairs of plasmids containing these truncated gene constructs. Homologous recombination or gene conversion within the homologous sequences (6 to 405 base pairs) of the protein-coding region of the truncated genes led to the restoration of the functional APH(3')II gene, rendering these cells resistant to kanamycin. Circular plasmid DNAs recombined very inefficiently, independent of the length of the homologous region. A double-strand break in one molecule only slightly increased the recombination frequency. The most favorable substrates for recombination were linear molecules. In this case, the recombination frequency was positively correlated with the length of the homologous regions. The recombination frequency of plasmids linearized at sites proximal to the deletion-homology junction was significantly higher than when linearization was distal to the homologous region. Vector homology within cotransformed plasmid sequences also increased the recombination frequency.
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