Specific recombinogenic activity of a new polyene antibiotic

Area of Science:

• Microbiology
• Toxicology
• Mycology

Background:

• A novel antibiotic, tetrapol A159, derived from Streptomyces sp., exhibits antifungal activity and shows promise for agricultural applications in controlling plant diseases.
• The genotoxic potential of tetrapol A159 requires thorough investigation to ensure its safety for agricultural use.

Purpose of the Study:

• To assess the genotoxic effects of tetrapol A159 using a battery of in vitro and in vivo test systems.
• To determine if tetrapol A159 induces mutations, chromosomal aberrations, or aneuploidy.

Main Methods:

• Bacterial mutagenicity was evaluated using the Ames test with Salmonella strains (TA100, TA98, TA1535, TA1537).
• In vivo genotoxicity was assessed via the micronucleus test in rat bone marrow cells.
• Fungal genotoxicity was examined in Aspergillus nidulans, focusing on mitotic recombination and aneuploidy.

Main Results:

• Tetrapol A159 did not induce point mutations in Salmonella strains across concentrations of 1-4000 mg/plate.
• No significant increase in chromosomal aberrations was observed in rat bone marrow cells at concentrations of 124-600 mg/kg b.w.
• A statistically significant threefold increase in mitotic crossovers was detected in Aspergillus nidulans at concentrations of 0.5-2.5 mg/ml.

Conclusions:

• Tetrapol A159 demonstrates a lack of genotoxic activity in bacterial and mammalian systems.
• The compound exhibits genotoxic potential in fungi, specifically inducing mitotic recombination in Aspergillus nidulans.
• Further research is warranted to understand the implications of fungal genotoxicity for agricultural applications.