What does mutagen mean?
A mutagen is any substance, physical agent, or biological process that causes a change in genetic material. Its name comes from the same Latin root associated with changing or exchanging something, reflecting the way mutagens alter DNA or RNA. In biology and medicine, mutagens are studied for their effects on cells, genes, and heredity. Some are naturally occurring, while others are industrial chemicals, components of tobacco smoke, or forms of radiation such as ultraviolet light. The word does not automatically mean that something causes cancer: a mutagen creates genetic changes, and the health consequences depend on the type of exposure, the affected cells, and the body’s response. The related adjective “mutagenic” is commonly used to describe a substance or effect.
nounA substance, physical agent, or biological process that causes mutations in the genetic material of cells. Mutagens can alter DNA or RNA and may contribute to the development of cancer or genetic damage.
- A substance, agent, or process that causes mutations in DNA or other genetic material.
"Radiation is a powerful mutagen that can damage DNA."
"The researchers identified a chemical in the smoke that acted as a strong mutagen."
"Ultraviolet light is a mutagen that can damage the DNA of skin cells."
Used when referring to more than one mutagen or to different types of mutagen.
"The study compared several common mutagens in human cells."
The word mutagen literally means “mutation-producing,” and some everyday substances—including tobacco smoke and certain pesticides—are familiar examples.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does mutagen come from?
The word mutagen was formed in the 20th century from the Latin root mutare, meaning “to change,” together with the suffix -gen, meaning “producing” or “producer.” Its development follows the earlier noun mutation, which had long been used in biology for a change in genetic material. The same Latin root appears in words such as mutable and mutiny, although those have developed in separate semantic directions.
Related word forms
How mutagen is actually used
The term is primarily used in biology, medicine, toxicology, and environmental science. It is more technical than the everyday expression “mutation-causing substance,” and it does not by itself mean that the agent is necessarily a poison or a carcinogen.
Easily confused with mutagen
A mutagen causes genetic mutations, whereas a carcinogen is capable of causing cancer; many carcinogens, but not all, act as mutagens.