DNA-directed RNA interference
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DNA-directed RNA interference (ddRNAi) is a gene-silencing technique that utilizes DNA constructs to activate an animal cell's endogenous RNA interference (RNAi) pathways. DNA constructs are designed to express self-complementary double-stranded RNAs, typically short-hairpin RNAs, that bring about the silencing of a target gene or genes once processed.[1] Any RNA, including endogenous messenger RNA (mRNAs) or viral RNAs, can be silenced by designing constructs to express double-stranded RNA complementary to the desired mRNA target.
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This mechanism has been demonstrated to work as a novel therapeutic technique to silence disease-causing genes across a range of disease models, including viral diseases such as HIV,[2] hepatitis B[3] or hepatitis C,[4] or diseases associated with altered expression of endogenous genes such as drug-resistant lung cancer,[5] neuropathic pain,[6] advanced cancer,[7] and retinitis pigmentosa.[8]