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. 1993 Dec;59(12):4289–4294. doi: 10.1128/aem.59.12.4289-4294.1993

Kinetics of the persistence of chromosomal DNA from genetically engineered Escherichia coli introduced into soil.

G Recorbet 1, C Picard 1, P Normand 1, P Simonet 1
PMCID: PMC195898  PMID: 8285718

Abstract

Investigations to quantify bacterial survival and DNA persistence of a genetically engineered population of Escherichia coli introduced into soil microcosms were carried out. The survival of E. coli was monitored by plate counting and immunofluorescence methods, whereas the persistence of the DNA was evaluated by using a most-probable-number-polymerase chain reaction method. Whereas the E. coli population density declined below the plate-counting-technique detection threshold (10(2) CFU.g-1) after 15 days, 10(3) extracellular and 5 x 10(5) total DNA target sequences were still detected after 40 days. Additionally, the E. coli cell counts fell below the detection limit of the immunofluorescence method (10(5) cells.g-1) before the end of the experiment. Colony hybridizations did not reveal gene transfer to the indigenous microflora. These results confirm the persistence of residual E. coli target sequences that could not be detected by the classical cell counting method and offer promising applications for the environmental detection of microorganisms, either engineered, pathogenic, or released for beneficial effects.

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Selected References

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