Bacteria gone native vs. bacteria gone awry?: Plasmidic transfer and bacterial evolution

Souza, Valeria; Eguiarte, Luis E.

doi:10.1073/pnas.94.11.5501

Cited by 45 publications

(23 citation statements)

References 22 publications

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“…The influence of plasmids has been extensively discussed in the literature from different evolutionary perspectives (20,(46)(47)(48), but only limited information about plasmid ecology and the specific roles that plasmids actively play within microbial systems in situ is available. Mosaic MGEs have often been documented in Firmicutes, reflecting a different epidemiological history of contacts with strains of the same or different species.…”

Section: An Eco-evo Perspective To Analyze Hgt In Firmicutesmentioning

confidence: 99%

The Plasmidome of Firmicutes: Impact on the Emergence and the Spread of Resistance to Antimicrobials

et al. 2015

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The phylum Firmicutes is one of the most abundant groups of prokaryotes in the microbiota of humans and animals and includes genera of outstanding relevance in biomedicine, health care, and industry. Antimicrobial drug resistance is now considered a global health security challenge of the 21st century, and this heterogeneous group of microorganisms represents a significant part of this public health issue.

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Section: An Eco-evo Perspective To Analyze Hgt In Firmicutesmentioning

confidence: 99%

The Plasmidome of Firmicutes: Impact on the Emergence and the Spread of Resistance to Antimicrobials

et al. 2015

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“…However, Wernegreen and colleagues (57) found a limited pattern of pSym transfer (48) in R. leguminosarum bv. trifolii populations associated with native Trifolium species growing in mountain meadows of California.…”

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confidence: 99%

Rhizobium etli and Rhizobium gallicum Nodulate Common Bean ( Phaseolus vulgaris ) in a Traditionally Managed Milpa Plot in Mexico: Population Genetics and Biogeographic Implications

Silva

Vinuesa

Eguiarte

et al. 2003

Appl Environ Microbiol

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The stability of the genetic structure of rhizobial populations nodulating Phaseolus vulgaris cultivated in a traditionally managed milpa plot in Mexico was studied over three consecutive years. The set of molecular markers analyzed (including partial rrs, glnII, nifH, and nodB sequences), along with host range experiments, placed the isolates examined in Rhizobium etli bv. phaseoli and Rhizobium gallicum bv. gallicum. Cluster analysis of multilocus enzyme electrophoresis and plasmid profile data separated the two species and identified numerically dominant clones within each of them. Population genetic analyses showed that there was high genetic differentiation between the two species and that there was low intrapopulation differentiation of the species over the 3 years. The results of linkage disequilibrium analyses are consistent with an epidemic genetic structure for both species, with frequent genetic exchange taking place within conspecific populations but not between the R. etli and R. gallicum populations. A subsample of isolates was selected and used for 16S ribosomal DNA PCR-restriction fragment length polymorphism analysis, nifH copy number determination, and host range experiments. Plasmid profiles and nifH hybridization patterns also revealed the occurrence of lateral plasmid transfer among distinct multilocus genotypes within species but not between species. Both species were recovered from nodules of the same plants, indicating that mechanisms other than host, spatial, or temporal isolation may account for the genetic barrier between the species. The biogeographic implications of finding an R. gallicum bv. gallicum population nodulating common bean in America are discussed.Rhizobia are soil bacteria that are capable of inducing the formation of nitrogen-fixing nodules on the roots or stems of particular legume host plants (51). Rhizobial species seem to have coevolved with their hosts at their centers of diversification (30). Common bean (Phaseolus vulgaris) originated in America; this plant was exported to the rest of the world starting in the early 16th century, and it is currently an important crop worldwide (17,18). At least five species have been reported to nodulate common bean. Rhizobium etli bv. phaseoli is the predominant P. vulgaris-nodulating species in Mexico, Colombia, and Argentina (1, 11, 42). R. etli bv. phaseoli is found in regions where common bean has been introduced, such as Spain, France, Austria, Senegal, Gambia, and Tunisia (10,21,24,33,34,44). However, in these countries other Rhizobium species also nodulate this legume. Rhizobium leguminosarum bv. phaseoli is commonly found in Europe, and it has also been reported to be present in Tunisia and Colombia (11,21,33,34). Rhizobium tropici is present in acid soils of South America (31) and has been found in France (2) and several African countries (4, 10). Rhizobium giardinii has been found only in European and Tunisian soils (3,21,34). Rhizobium gallicum has been found nodulating beans in Europe (3,21) and Tunisia (33,34), and ...

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“…They are typically composed of conserved backbone modules coding for replication, maintenance and transfer functions as well as variable accessory modules. The capture of genetic modules by plasmid backbones can increase phenotypic diversity and thereby increment the chances of responding to uncertain environmental changes or exploit an opportunity for niche expansion (Souza and Eguiarte 1997;Frost et al, 2005;Heuer et al, 2008;Norman et al, 2009). Often, antimicrobial or heavy metal resistance, or virulence factors that allow their bacterial host to adapt to changing environments are encoded by plasmids.…”

Section: Antimicrobial Resistance and Virulence Plasmidsmentioning

confidence: 99%

The Importance of Mobile Genetic Elements in the Evolution of Salmonella: Pathogenesis, Antibiotic Resistance and Host Adaptation

Wiesner¹,

Calva²

2012

Salmonella - A Diversified Superbug

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Bacteria gone native vs. bacteria gone awry?: Plasmidic transfer and bacterial evolution

Cited by 45 publications

References 22 publications

The Plasmidome of Firmicutes: Impact on the Emergence and the Spread of Resistance to Antimicrobials

The Plasmidome of Firmicutes: Impact on the Emergence and the Spread of Resistance to Antimicrobials

Rhizobium etli and Rhizobium gallicum Nodulate Common Bean ( Phaseolus vulgaris ) in a Traditionally Managed Milpa Plot in Mexico: Population Genetics and Biogeographic Implications

The Importance of Mobile Genetic Elements in the Evolution of Salmonella: Pathogenesis, Antibiotic Resistance and Host Adaptation

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