Influence of homology size and polymorphism on plasmid integration in the yeast CYC1 DNA region |
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Authors: | Predrag Koren Ivan K Svetec Petar T Mitrikeski Zoran Zgaga |
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Institution: | (1) Laboratory of Biology and Microbial Genetics, Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10.000 Zagreb, Croatia e-mail: zgazo@pbf.hr Fax: 385-1-48-36 016, XX |
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Abstract: | We studied the influence of homology size and polymorphism on the integration of circular plasmids into the yeast CYC1 region. The plasmids used also contained the URA3 gene, and the proportion of Ura+ transformants resulting from plasmid integration into the CYC1 region was determined by Southern-blot analysis. A size-dependent decrease in integration into the CYC1 region was observed from 858 bp to 363 bp of homology. However, with a homology size of 321, 259 or 107 bp, about 2% of the
transformants still contained plasmid molecules integrated in the CYC1 region. A single point mutation in the 858-bp fragment decreased the proportion of integrations to the CYC1 gene, but the presence of additional mutations did not have a cumulative effect. For plasmids isolated in a single-stranded
(ss) form, the presence of two or six point mutations did not influence integration. These results were compared with those
obtained in other assays designed to study substrate requirements for homologous recombination.
Received: 18 October / 15 December 1999 |
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Keywords: | DNA homology Recombination Integrative plasmids Yeast |
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