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Summary

The reliability of Tn 5 as labelling tool was investigated in soil microcosm. The occurence of a selective in soil microcosm. The occurence of resistances encoded by Tn 5 nptII gene was assesed by kanamycin and neomycin amendment. The bioassay developed to monitor the persistence of the soil-added kanamycin did not detect the antibiotic activity in soil extract. A nptII-engineered Escherichia coli strain showed no enhanced survival in aminoglycoside amended soil. Tn 5-marker properties were investigated within indigenous bacteria to determine the specificity of labelling to follow the fate of recombinant DNA. Kanamycin and neomycin resistant population levels made Tn 5 aminoglycoside-resistance phenotype non-sensitive enough to select a soil dissemination of the labelled DNA. The unexpected occurrence of homologous sequences among soil organisms also prevented Tn 5 from being a specific DNA marker. By contrast, colony hybridization did not reveal homology to nptII suggesting its use as a reliable gene transfer indicator.

Kanamycin, Neomycin, Escherichia coli, Population dynamics, nptII Gene, Colony-hybridization

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© 1992 Federation of European Microbiological Societies
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