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Genotoxicity of the phosphoramidate agent tabun (GA)
B W Wilson1, T G Kawakami, N Cone
1Department of Avian Sciences, University of California, Davis 95616-5224.
Toxicology
|January 26, 1994
Summary
Agent GA (Tabun) showed mutagenic effects in some tests, acting as a weak mutagen. Further research is needed to understand its full toxicological profile for safe demilitarization.
Area of Science:
- Toxicology
- Genetics
- Chemical Warfare Agents
Background:
- Agent GA (Tabun) is a chemical warfare agent targeted for demilitarization.
- Understanding its mutagenic potential is crucial for risk assessment and safe handling.
Purpose of the Study:
- To evaluate the mutagenicity of Agent GA (Tabun) using a battery of five assays.
- To determine the genotoxic profile of Agent GA for demilitarization safety protocols.
Main Methods:
- Agent GA was tested in Salmonella spp. assays (with and without S-9 activation).
- Mutagenicity was assessed in mouse lymphoma cells and via unscheduled DNA synthesis in rat hepatocytes.
- Sister chromatid exchanges were analyzed in mouse cells both in vitro and in vivo.
Main Results:
- Agent GA demonstrated mutagenicity in Salmonella spp. assays and acted as a direct mutagen in mouse lymphoma cells.
- It induced sister chromatid exchanges in mouse cells (in vitro and in vivo).
- Agent GA did not promote unscheduled DNA synthesis in rat hepatocytes, indicating limited DNA repair induction.
Conclusions:
- Agent GA is classified as a weakly acting mutagen, confirmed by positive results in three of five assays.
- Observed mutagenic effects were often less than 2-fold increases over controls and occurred near toxic concentrations.
- These findings support the need for careful handling during the demilitarization of Agent GA.
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