What Is the In Vitro Mammalian Chromosomal Aberration Test?

The In Vitro Mammalian Chromosomal Aberration Test is one of the key genotoxicity tests conducted to assess a substance’s potential to cause structural chromosomal damage in mammalian cells. Conducted in accordance with the OECD TG 473 guideline, this study is used to determine whether the substances being tested cause breaks, deletions, translocations, and other structural abnormalities in chromosomes.

Widely used in safety assessments of pharmaceuticals, biocidal products, medical devices, chemicals, and various industrial products, this test is recognized as a fundamental component of genetic toxicology studies.

At NanoTox, within our Genetic Toxicology Unit, we offer reliable In Vitro Mammalian Chromosomal Aberration Test services that comply with international standards.

Purpose of the In Vitro Mammalian Chromosomal Aberration Test

This test aims to determine a substance’s potential to disrupt the chromosomal structure and cause genetic damage in mammalian cells.

Through these studies:

• The risk of chromosomal damage 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 help establish the product’s genotoxic risk profile.

What Is Chromosomal Aberration?

Chromosomal aberrations are changes in the structure of chromosomes that occur during cell division. These changes may indicate a disruption in DNA integrity and can be associated with various health risks in the long term.

Chromosomal aberrations may include:

• Chromosome breaks,
• Chromatid breaks,
• Deletions,
• Translocations,
• Dicentric chromosome formations,
• and circular chromosomes.

For this reason, chromosomal aberration analysis is used as an important biomarker in genotoxicity assessments.

Studies Conducted in Accordance with OECD TG 473

Studies conducted at NanoTox are carried out in accordance with OECD Test Guideline 473 – In Vitro Mammalian Chromosomal Aberration Test.

Under this guideline:

• Appropriate mammalian cell lines are used,
• Metabolically activated and non-activated systems are evaluated,
• positive and negative controls are applied,
• and cytotoxicity and chromosomal damage analyses are performed together.

OECD TG 473 is one of the fundamental genotoxicity tests accepted by regulatory authorities worldwide.

Test Principle

During the test, mammalian cells are exposed to the test substance at different concentrations. Following exposure, the cells are examined in the metaphase stage, and changes in the chromosomal structure are evaluated microscopically.

Cell types frequently used in studies:

• Human peripheral blood lymphocytes,
• CHO cells,
• CHL cells,
• V79 cells

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

Parameters Evaluated Within the Test Scope

Within the scope of the In Vitro Mammalian Chromosomal Aberration Test:

• Structural chromosomal aberrations,
• Chromatid and chromosome breaks,
• Cell proliferation,
• Cytotoxicity assessments,
• Dose-response relationships,
• Metabolic activation effects

These evaluations scientifically demonstrate the tested substance’s potential to cause chromosomal damage.

Reliable Genetic Toxicology Studies with NanoTox

NanoTox conducts In Vitro Mammalian Chromosomal Aberration Tests in accordance with OECD TG 473 and international quality standards, leveraging its expert genetic toxicology team and advanced laboratory infrastructure. We ensure the generation of reliable genotoxicity data required for product safety and regulatory processes.

Please contact NanoTox for detailed information about the In Vitro Mammalian Chromosomal Aberration Test and our other genetic toxicology services.