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Tracking microorganisms and genes in the environment.

R M Atlas¹, G S Sayler

¹Department of Biology, University of Louisville, Kentucky 40292.

Basic Life Sciences

|January 1, 1988

Summary

Detecting genetically modified organisms (GMOs) in the environment requires reliable methods. Direct DNA extraction and gene probing offer sensitive and precise detection, even for non-culturable GMOs.

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Area of Science:

Environmental microbiology
Molecular biology
Biotechnology

Background:

Intentional release of genetically modified organisms (GMOs) into the environment requires robust tracking methodologies.
Assessing the environmental fate of GMOs and their genetic material is crucial for risk assessment.

Purpose of the Study:

To evaluate the sensitivity and limitations of different methods for detecting genetically modified organisms (GMOs) and their genes in environmental samples.
To identify optimal methodologies for tracing GMOs and their genetic elements post-release.

Main Methods:

Selective viable plate counts for culturable organism detection.
Colony hybridization using specific gene probes to identify introduced genes.
Direct DNA extraction from environmental samples followed by dot blot or solution hybridization with gene probes.

Main Results:

Plate counts are sensitive but limited by mutations, indigenous organisms, and culturability requirements.
Colony hybridization improves accuracy but remains dependent on plating sensitivity.
Direct DNA extraction coupled with hybridization offers high sensitivity and precision without culturing, detecting genes in various scenarios.

Conclusions:

Direct DNA extraction and gene probing are superior methods for detecting GMOs and their genes in diverse environmental matrices.
These molecular methods overcome limitations of traditional culturing techniques for environmental monitoring of GMOs.
The developed methods ensure accurate tracking of introduced genes, regardless of organism viability or horizontal gene transfer.

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