The antisense approach is use of nucleic acids to reduce the expression of a specific target gene. As shown in Figure 58.2, a small piece of DNA, an oligodeoxynu-cleotide that is in the reverse orientation (antisense) to a portion of a target messenger RNA (mRNA) species, is introduced into a cell and a DNA-RNA duplex is formed by complementary Watson-Crick base pairing. Cessation of protein synthesis then may result from the rapid

Antisense Oligomer

Sense mRNA

Antisense mRNA

RNA = RNA duplex

DNA = RNA I duplex

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