title: Population dynamics of transgenic strain Escherichia coli Z905/pPHL7 in freshwater and saline lake water microcosms with differing microbial community structures.
abstract: Populations of Escherichia coli Z905/pPHL7, a transgenic microorganism, were heterogenic in the expression of plasmid genes when adapting to the conditions of water microcosms of various mineralization levels and structure of microbial community. This TM has formed two subpopulations (ampicillin-resistant and ampicillin-sensitive) in every microcosm. Irrespective of mineralization level of a microcosm, when E. coli Z905/pPHL7 alone was introduced, the ampicillin-resistant subpopulation prevailed, while introduction of the TM together with indigenous bacteria led to the dominance of the ampicillin-sensitive subpopulation. A high level of lux gene expression maintained longer in the freshwater microcosms than in sterile saline lake water microcosms. A horizontal gene transfer has been revealed between the jointly introduced TM and Micrococcus sp. 9/pSH1 in microcosms with the Lake Shira sterile water.
authors.affiliation: Laboratory of Controlled Heterotroph Biosynthesis, Institute of Biophysics, Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russian Federation. lubg@ibp.ru
authors.forename: L Yu
authors.initials: LY
authors.lastname: Popova
authors.forename: T V
authors.initials: TV
authors.lastname: Kargatova
authors.forename: E E
authors.initials: EE
authors.lastname: Ganusova
authors.forename: T I
authors.initials: TI
authors.lastname: Lobova
authors.forename: A N
authors.initials: AN
authors.lastname: Boyandin
authors.forename: O A
authors.initials: OA
authors.lastname: Mogilnaya
authors.forename: N S
authors.initials: NS
authors.lastname: Pechurkin
mesh_terms: D000668:Ampicillin Resistance / Q000235:genetics; D017753:Ecosystem; D004783:Environmental Microbiology; D004926:Escherichia coli / Q000235:genetics* / Q000254:growth & development*; D005618:Fresh Water; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D008837:Micrococcus / Q000235:genetics / Q000254:growth & development; D030781:Organisms, Genetically Modified; D010957:Plasmids / Q000235:genetics; D011157:Population Dynamics; D012492:Salts; D014871:Water Microbiology
chemical_list: D012492:Salts; C017082:brine