What Is the Bacterial Reverse Mutation (Ames) Test?

The Bacterial Reverse Mutation Test, commonly known as the Ames Test, is one of the fundamental genotoxicity tests conducted to evaluate a substance’s potential to cause mutations in genetic material. Conducted in accordance with the OECD TG 471 guideline, this study plays a critical role in the safety assessments of pharmaceuticals, medical devices, biocidal products, cosmetic raw materials, industrial chemicals, and various newly developed substances.

The Ames test enables the early assessment of potential genetic risks by determining a substance’s potential to induce mutations in DNA. For this reason, it is recognized as one of the first and most important steps in genetic toxicology studies.

At NanoTox, within our Genetic Toxicology Unit, we offer Ames Test services that comply with GLP (Good Laboratory Practice) principles and meet international standards.

Purpose of the Bacterial Reverse Mutation (Ames) Test

The Ames Test aims to determine whether the tested substance causes gene mutations in bacterial cells.

Through these studies:

• Mutagenic potential is assessed,
• Genetic safety data is obtained,
• Product development processes are supported,
• Regulatory requirements are met,
• Contributions are made to human health risk assessments.

The results obtained play a significant role in determining the product’s genotoxic risk profile.

Why Is the Ames Test Important?

Genetic mutations can be linked to the development of cancer and various genetic diseases in the long term. Therefore, evaluating the mutagenic potential of newly developed products is one of the fundamental components of safety studies.

Studies Conducted in Accordance with OECD TG 471

Ames Tests conducted at NanoTox are carried out in accordance with OECD Test Guideline 471 – Bacterial Reverse Mutation Test.

Under this guideline:

• Appropriate bacterial strains are used,
• Positive and negative controls are evaluated,
• Metabolically activated and non-activated systems are applied,
• The dose-response relationship is analyzed.

The OECD TG 471 standard is one of the fundamental genotoxicity methods accepted by regulatory authorities worldwide.

Test Principle

In the Ames test, specific bacterial strains that cannot synthesize histidine or tryptophan are used. The test substance is brought into contact with the bacteria, and colonies that regain the ability to proliferate as a result of mutation are evaluated.

Strains frequently used in studies include:

• Salmonella typhimurium TA98
• Salmonella typhimurium TA100
• Salmonella typhimurium TA1535
• Salmonella typhimurium TA1537
• Escherichia coli WP2 uvrA

Additionally, the S9 metabolic activation system may be used to mimic mammalian metabolism.

Parameters Evaluated Within the Scope of the Test

Within the scope of the Bacterial Reverse Mutation Test:

• Number of revertant colonies,
• Dose-response relationship,
• Assessment of mutagenic activity,
• Cytotoxicity observations,
• Effects of metabolic activation,
• Statistical analyses

are evaluated.

These data enable a scientific assessment of the mutagenic potential of the tested substance.

Reliable Genetic Toxicology Studies with NanoTox

NanoTox conducts Ames Tests in accordance with OECD TG 471 and international quality standards, supported by a team of expert genetic toxicologists and modern laboratory infrastructure. We provide the reliable genotoxicity data required in the development processes of pharmaceuticals, medical devices, biocidal products, and chemical substances.

Please contact NanoTox for detailed information about the Bacterial Reverse Mutation (Ames) Test and our other genetic toxicology services.