What is the major advantage of using RNAi in therapeutic applications?

• A. It permanently changes the genetic makeup of cells
• B. It can specifically target and silence genes of interest
• C. It increases the production of all proteins
• D. It is a quick method with no side effects

Answer: (B)

The major advantage of using RNA interference (RNAi) in therapeutic applications lies in its ability to specifically target and silence genes of interest. RNAi functions through a natural cellular mechanism that utilizes small interfering RNA (siRNA) or microRNA (miRNA) to degrade messenger RNA (mRNA) corresponding to specific genes, effectively preventing the synthesis of the proteins those genes encode. This targeted approach makes RNAi particularly valuable in therapeutic contexts, such as treating diseases caused by the overexpression of harmful genes, viral infections, or genetic disorders.

By focusing on specific gene silencing, RNAi can reduce off-target effects, allowing for more precise interventions. This specificity differentiates RNAi from other genetic approaches that may not provide the same level of control over gene expression. The fundamental nature of RNAi as a regulatory process within the cell highlights its potential in developing therapies that need to fine-tune or knock down unwanted gene expression without altering the overall genome.

In contrast, other choices do not accurately reflect the capabilities or attributes of RNAi. For instance, permanently altering the genetic makeup of cells is characteristic of techniques like CRISPR/Cas9, which involves editing the DNA itself, rather than transiently silencing gene expression. While RNAi can be relatively