Ethyl methanesulfonate

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Ethyl methanesulfonate (EMS) is a chemical compound that is widely used as a mutagen in genetic research. It is an alkylating agent that induces mutations by transferring an ethyl group to DNA, which can result in point mutations.

Chemical Properties

Ethyl methanesulfonate has the chemical formula C₃H₈O₃S and a molecular weight of 124.16 g/mol. It is a colorless liquid with a slight odor and is soluble in water and most organic solvents.

Mechanism of Action

EMS primarily induces mutations by ethylating the guanine base in DNA, which can lead to mispairing during DNA replication. This results in G:C to A:T transitions, which are a common type of point mutation. The mutagenic effects of EMS are dose-dependent and can be used to create mutant strains for genetic studies.

Applications in Research

Ethyl methanesulfonate is extensively used in mutagenesis screens to identify gene functions and to create mutant libraries. It is particularly useful in model organisms such as Drosophila melanogaster, Caenorhabditis elegans, and Arabidopsis thaliana. EMS-induced mutations have been instrumental in the discovery of numerous genes and genetic pathways.

Safety and Handling

EMS is a potent mutagen and is considered a carcinogen. Proper safety measures, including the use of personal protective equipment (PPE) and working in a fume hood, are essential when handling this chemical. It should be stored in a cool, dry place away from incompatible substances.

See Also

• Mutagen
• Alkylating agent
• Point mutation
• Genetic research
• Model organism