What evidence suggests that RNA interference depends on mRNA...

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Key Concepts

RNA interference (RNAi)

RNA interference is a cellular process where small RNA molecules suppress gene expression by binding to complementary mRNA targets. This pathway ultimately leads to gene silencing, and the evidence for its action includes the reduction or fragmentation of mRNA, highlighting the mechanism’s reliance on mRNA degradation.

mRNA degradation

mRNA degradation is the enzymatic breakdown process of messenger RNA within the cell. Within the RNAi pathway, experimental observations such as lower levels of intact mRNA and the presence of specific cleavage products provide concrete evidence that mRNA degradation is a key consequence of RNAi.

RISC (RNA-induced silencing complex)

The RISC is a multiprotein complex that incorporates small RNA molecules and directs them to their complementary mRNA targets. By cleaving the target mRNA, RISC is central to RNAi, and its activity offers clear evidence that the suppression of gene expression relies on the degradation of mRNA.

Small interfering RNA (siRNA)

siRNAs are short double-stranded RNA molecules that guide the RNAi machinery to specific mRNA targets. Their ability to induce targeted mRNA cleavage, as observed in degradation assays, reinforces the concept that RNA interference depends on mRNA degradation for gene silencing.

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