What is gene silencing?

• A. A technique to amplify gene expression
• B. Methods used to inhibit gene expression or translation
• C. A process for cloning genes
• D. Strategies to enhance gene therapy outcomes

Answer: (B)

Gene silencing refers to various techniques that inhibit gene expression or translation, effectively reducing or eliminating the production of specific proteins. This process is crucial in research and therapeutic applications where controlling gene expression is necessary to study gene function or to treat diseases caused by the overexpression of certain genes, such as cancer.

Methods of gene silencing can involve mechanisms such as RNA interference (RNAi), which uses small interfering RNA (siRNA) or microRNA (miRNA) to target mRNA for degradation, preventing translation into protein. Other approaches include the use of antisense oligonucleotides or CRISPR-based techniques that can specifically target and silence genes of interest.

While amplifying gene expression, cloning genes, or enhancing gene therapy outcomes are significant concepts in genetic engineering and biotechnology, they do not align with the definition of gene silencing, which focuses specifically on the downregulation of gene activity.