OECD Guidelines for the Testing of Chemicals, Section 4

Health Effects

2074-5788 (online)
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The OECD Guidelines for the Testing of Chemicals is a collection of about 100 of the most relevant internationally agreed testing methods used by government, industry and independent laboratories to identify and characterise potential hazards of new and existing chemical substances, chemical preparations and chemical mixtures. They are a set of tools for professionals, used primarily in regulatory safety testing and subsequent chemical and chemical product notification and chemical registration. They can also be used for the selection and ranking of candidate chemicals during the development of new chemicals and products and in toxicology research. This group of tests covers health effects.

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Test No. 484: Genetic Toxicology: Mouse Spot Test

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Publication Date :
23 Oct 1986
Pages :
9789264071483 (PDF)

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The mouse spot test detects presumed somatic mutations in fetal cells following transplacental absorption of the test substance.

This is an in vivo test in mice in which developing embryos are exposed to a chemical (solid, liquid, vapour or gaseous). The target cells in the developing embryos are melanoblasts, and the target genes are those which control the pigmentation of the coat hairs. A mutation of such a gene in a melanoblast results in changed colour spot in the coat of the resulting mouse. The mice are coded and scored for spots between three and four weeks after birth. The frequency of spots of genetic relevance in treated groups is compared with their frequency in the control group. Sufficient pregnant females are treated (by oral intubation or intraperitoneal injection) to provide an appropriate number of surviving mice at each dose level used. At least two appropriately spaced dose levels are used including one producing signs of toxicity or reduced litter size. There are several criteria for determining a positive result. A test substance producing, neither a statistically significant dose-related increase in the frequency of genetically relevant spots, nor a statistically significant positive response at any of the test points is considered non-mutagenic in this system.

NB. This Test Guideline will be deleted on 2nd April 2014.

Also available in: French