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◉ Science·2 min·Updated Mar 14, 2026

What is RNA Interference (RNAi)?

RNA Interference

Quick Answer

RNA interference (RNAi) is a biological process where small RNA molecules inhibit gene expression by destroying specific messenger RNA (mRNA) molecules. This process helps regulate various cellular functions and can protect cells from viral infections.

Overview

RNA interference (RNAi) is a natural mechanism used by cells to control the expression of genes. It works by using small RNA molecules, such as small interfering RNA (siRNA) and microRNA (miRNA), which bind to messenger RNA (mRNA) and prevent it from being translated into proteins. This process is crucial for regulating important cellular functions and maintaining the balance of gene expression within the cell. When a virus infects a cell, RNAi acts as a defense mechanism. The viral RNA is recognized by the cell's RNA machinery, which then produces small RNA molecules that target the viral RNA for destruction. This prevents the virus from replicating and helps protect the cell from infection, illustrating how RNAi plays a vital role in the immune response of organisms. RNA interference has significant implications in research and medicine. Scientists can use RNAi to silence specific genes, allowing them to study the function of those genes in detail. Additionally, RNAi has potential therapeutic applications, such as developing treatments for diseases caused by harmful gene expressions, including certain cancers and genetic disorders.

Frequently Asked Questions

RNA interference was discovered in the late 1990s when researchers found that introducing double-stranded RNA into cells could silence specific genes. This unexpected finding led to a deeper understanding of gene regulation and the role of small RNA molecules.
Yes, RNA interference has promising applications in medicine, particularly in developing therapies for diseases caused by overactive or mutated genes. Researchers are exploring RNAi-based treatments for conditions like cancer, viral infections, and genetic disorders.
While RNA interference holds great potential, there are risks, such as off-target effects where unintended genes may be silenced. This could lead to unexpected side effects, so careful design and testing are crucial when using RNAi in research and therapy.