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The difference between siRNA vs miRNA?

The difference between siRNA vs miRNA? - RNAi and SiRNA Forum

The difference between siRNA vs miRNA? - Discuss and Post Questions in this forum about RNA interference and siRNA. RNAi and siRNA transfection, inhibition of endogenous genes, and miRNA and shRNA.


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Old 11-02-2012, 05:17 PM
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Default The difference between siRNA vs miRNA?



I know that siRNAs silences the gene that produces it and can shut off undesirable genetic elements but what cab miRNAs do like what is the MAIN difference
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Old 11-05-2012, 04:09 PM
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Default Re: The difference between siRNA vs miRNA?

The terms are not very tightly defined; there is disagreement about their usage. I think this is a useful rule-of-thumb distinction: siRNA is exogenous (introduced by researchers), miRNA is endogenous (produced naturally by the cells). In general, an siRNA is completely complementary to its intended target while an miRNA is partially complementary to the mRNAs it regulates. A sequence associated with RISC which is completely complementary to an mRNA usually induces cleavage of the mRNA by the argonaute protein in RISC, while the translation of a partially-complementary target can by altered (usually suppressed) by RISC. A complementary miRNA might, in addition to cleaving its target, also alter translation of other, partially-complementary mRNAs; this leads to the widespread of-target gene regulation typically seen with siRNA. While endogenous miRNAs also regulate expression of many mRNAs, their long history ensures that this regulation has been tuned by selection pressure and the cell is well-adapted to the complex regulation of the miRNA. An siRNA, on the other hand, when introduced to a cell may have catastrophic effects because unexpected off-target interactions have not been experienced by the cell over evolutionary time.
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Last edited by Jon Moulton; 11-05-2012 at 04:10 PM. Reason: Tense change of verb
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