Mutagen

5-Chlorouracil

A Mutagen is a physical or chemical agent that changes the genetic material, usually DNA, of an organism and thus increases the frequency of mutations above the natural background level. As many mutations can cause cancer, mutagens are therefore also likely to be carcinogens, although not always necessarily so. Not all mutations are caused by mutagens: so-called "spontaneous mutations" occur due to spontaneous hydrolysis, errors in DNA replication, repair and recombination.

Types of Mutagens

Mutagens can be classified into two broad categories: physical mutagens and chemical mutagens.

Physical Mutagens

Physical mutagens are sources of energy that can cause changes in the DNA structure. Examples include ultraviolet (UV) light and ionizing radiation.

Chemical Mutagens

Chemical mutagens are substances that can interact with DNA to cause a mutation. Examples include nitrous acid, base analogs, alkylating agents, and intercalating agents.

Effects of Mutagens

Mutagens can cause changes in the DNA sequence, such as point mutations, insertions, and deletions. These changes can lead to genetic disorders, cancer, and other diseases.

Detection and Prevention of Mutagens

There are several methods to detect mutagens, including the Ames test, the mouse lymphoma assay, and the comet assay. Prevention of exposure to mutagens is an important aspect of public health.

See Also

• Carcinogen
• Genotoxicity
• Teratogen