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. 1997 Mar;63(3):888–895. doi: 10.1128/aem.63.3.888-895.1997

Plasmids isolated from marine sediment microbial communities contain replication and incompatibility regions unrelated to those of known plasmid groups.

P A Sobecky 1, T J Mincer 1, M C Chang 1, D R Helinski 1
PMCID: PMC168381  PMID: 9055407

Abstract

Two hundred ninety-seven bacteria carrying plasmids that range in size from 5 to 250 kb were identified from more than 1,000 aerobic heterotrophic bacteria isolated from coastal California marine sediments. While some isolates contained numerous (three to five) small (5- to 10-kb) plasmids, the majority of the natural isolates typically contained one large (40- to 100-kb) plasmid. By the method of plasmid isolation used in this study, the frequency of plasmid incidence ranged from 24 to 28% depending on the samples examined. Diversity of the plasmids occurring in the marine sediment bacterial populations was examined at the molecular level by hybridization with 14 different DNA probes specific for the incompatibility and replication (inc/rep) regions of a number of well-characterized plasmid incompatibility groups (repB/O, FIA, FII, FIB, HI1, HI2, I1, L/M, X, N, P, Q, W, and U). Interestingly, we found no DNA homology between the plasmids isolated from the culturable bacterial population of marine sediments and the replicon probes specific for numerous incompatibility groups developed by Couturier et al. (M. F. Couturier, F. Bex, P. L. Bergquist, and W. K. Maas, Microbiol. Rev. 52:375-395, 1988). Our findings suggest that plasmids in marine sediment microbial communities contain novel, as-yet-uncharacterized, incompatibility and replication regions and that the present replicon typing system, based primarily on plasmids derived from clinical isolates, may not be representative of the plasmid diversity occurring in some marine environments. Since the vast majority of marine bacteria are not culturable under laboratory conditions, we also screened microbial community DNA for the presence of broad- and narrow-host-range plasmid replication sequences. Although the replication origin of the conjugally promiscuous broad-host-range plasmid RK2 (incP) was not detectable in any of the plasmid-containing culturable marine isolates, DNA extracted from the microbial community and amplified by PCR yielded a positive signal for RK2 oriV replication sequences. The strength of the signal suggests the presence of a low level of the incP replicon within the marine microbial community. In contrast, replication sequences specific for the narrow-host-range plasmid F were not detectable in DNA extracted from marine sediment microbial communities. With the possible exception of mercuric chloride, phenotypic analysis of the 297 plasmid-bearing isolates did not demonstrate a correlation between plasmid content and antibiotic or heavy metal resistance traits.

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Selected References

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