Enhancer Mutations and Chemical Enhancers
An enhancer mutation can be defined as a second mutation that intensifies the phenotype caused by the first mutation. Enhancement may result from various types of genetic interactions. For instance, two genes may function redundantly. Otherwise, mutations in two genes that are both required for the same function. Genes encoding either components of a protein complex or proteins responsible for sequential steps in a signal transduction pathway or in a biosynthesis pathway are examples.