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A novel gene tag for identifying microorganisms released into the environment
1Department of Plant Pathology, University of Illinois at Urbana-Champaign 61801.
Applied and Environmental Microbiology
|March 1, 1994
Summary
A new method uses the mannityl opine catabolism (moc) gene region to tag genetically modified bacteria like Pseudomonas fluorescens. This allows for selective recovery and sensitive detection using PCR, even in complex environmental samples.
Area of Science:
- Microbiology
- Molecular Biology
- Environmental Science
Background:
- Genetically modified microorganisms (GMMs) require reliable tracking methods for environmental release.
- Existing detection methods may lack specificity or sensitivity in complex environments.
Purpose of the Study:
- To develop and validate a novel gene tag system for identifying and tracking genetically modified Pseudomonas fluorescens in the environment.
- To enable selective recovery and sensitive detection of the modified strain.
Main Methods:
- Utilized the mannityl opine catabolism (moc) region from Agrobacterium tumefaciens Ti plasmid.
- Constructed modified Pseudomonas fluorescens strains via marker exchange with moc or moc::nptII.
- Developed nucleic acid-based detection strategies using PCR amplification of unique DNA fusion regions.
Main Results:
- Modified strains gained the ability to utilize agropine (AGR) as a sole carbon source.
- Selective recovery of marked strains from mixed populations was achieved through AGR catabolism.
- PCR detection of fused DNA demonstrated high sensitivity and specificity, comparable to existing gene tags.
Conclusions:
- The moc gene region serves as an effective tag for genetically modified microorganisms.
- The developed system allows for selective recovery and sensitive, specific detection via PCR.
- This strategy enhances the monitoring of GMMs released into the environment.