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Replication functions of new broad host range plasmids isolated from polluted soils
Marie-Eve Gstalder1, Michel Faelen, Natacha Mine
1Laboratoire de Génétique des Procaryotes, IBMM, Université Libre de Bruxelles, rue des Prof. Jeener et Brachet, 12, 6104 Gosselies, Belgium. mgstalder@9online.fr
Research in Microbiology
|September 23, 2003
Summary
Three new broad host range plasmids from polluted soils reveal novel plasmid families. These findings highlight plasmid genetic flexibility and the need for diverse analytical techniques to track gene spread.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Broad host range plasmids play a crucial role in bacterial genetic exchange.
- Understanding plasmid replication and incompatibility is key to controlling their spread.
Purpose of the Study:
- To characterize the replicons of three novel broad host range plasmids (pMOL98, pEMT8, pEMT3).
- To investigate their evolutionary relationships and potential roles in horizontal gene transfer.
Main Methods:
- Nucleotide sequencing of plasmid replicons.
- Complementation experiments to identify origin regions and replication genes.
- Sequence comparisons and phylogenetic analysis.
- Incompatibility phenotype determination.
Main Results:
- pMOL98, pIP02T, and pSB102 share high sequence identity in their replication regions, suggesting a new Inc/Rep family distantly related to IncW plasmids.
- pEMT8 and four other unclassified plasmids may form a new family with similar Rep proteins but distinct incompatibility phenotypes.
- pEMT3 shows clear relatedness to IncP plasmids, with divergence within IncPalpha and IncPbeta subgroups, indicating ongoing evolution.
Conclusions:
- Plasmids exhibit significant genetic plasticity, facilitating adaptation and evolution.
- Novel plasmid families and evolutionary dynamics are identified, expanding our understanding of plasmid diversity.
- Integrated multi-technique approaches are essential for comprehensive plasmid analysis and understanding their role in bacterial trait dissemination.