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. 1990 Jun;56(6):1818–1824. doi: 10.1128/aem.56.6.1818-1824.1990

Detection of Horizontal Gene Transfer by Natural Transformation in Native and Introduced Species of Bacteria in Marine and Synthetic Sediments

Gregory J Stewart 1,*, Christopher D Sinigalliano 1
PMCID: PMC184516  PMID: 16348222

Abstract

Both naturally occurring marine sediments and artificial sediments were used as supports for natural transformation of marine bacteria. While transformation of Pseudomonas stutzeri ZoBell suspended in artificial seawater was not detected when recipient cells and rifampin resistance DNA were loaded onto sterile sediment columns, transformation could be detected at frequencies 4 to 20 times that of spontaneous resistance when recipient cells and rifampin resistance DNA were loaded onto sterile sediment columns. Treatment of these columns with DNase I reduced transformation frequencies to levels comparable to those of spontaneous-resistance frequencies. Sediments with higher organic contents supported higher frequencies of transformation than did those with lower amounts of organic matter. Transformation was also detected when recipient cells and DNA were loaded on columns prepared from nonsterile sediments, although the frequencies of transformation were lower than when sterile sediments were used. Finally, nonsterilized sediments that were not supplemented with laboratory strains did not support detectable levels of transformation in sediment columns, but when these same sediments were transferred to filters and placed on complex media, transformation was detected at a frequency three times that for spontaneous resistance. This transformation frequency was partially reduced to levels near that for spontaneous resistance by the addition of DNase I to sediment filters. These results indicate that marine sediments facilitate the uptake and expression of exogenous DNA by transformable marine bacteria and that sediments are a more likely niche for natural transformation than the water column in the marine environment.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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