Sense effect of RNAi

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Hannah2008
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Sense effect of RNAi

Post by Hannah2008 » Thu Feb 03, 2011 3:53 pm

Does anyone know the basis for why sense RNA has been shown to be effective at knocking down transcription as antisense? Thanks,
Hannah

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JackBean
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Post by JackBean » Thu Feb 03, 2011 5:21 pm

I would guess affection of transcription
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

magicsiew
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Post by magicsiew » Sun Feb 06, 2011 11:11 am

It can either block or cleave the mRNA... Can get more detail if u read on miRNA and siRNA...

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JackBean
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Post by JackBean » Sun Feb 06, 2011 12:08 pm

really? Sense RNA?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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Post by magicsiew » Mon Feb 07, 2011 4:16 pm

Sense RNA is mRNA, which can code for protein or RNA as end product. Therefore if the sense RNA (mRNA) is code of RNA as end product, its corresponding strand later will form a duplex, cut by dicer, combine with other protein and modification then form siRNA or miRNA which will knockdown transcription.

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JackBean
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Post by JackBean » Mon Feb 07, 2011 7:14 pm

form duplex with what? :roll:
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

Hannah2008
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Post by Hannah2008 » Mon Feb 07, 2011 7:49 pm

If you are introducing a sense strand of mRNA into the cell, what would it bind to form a duplex, since the endogenous mRNA would also be in the sense direction?
Unless there is double stranded contamination, which is one explanation...

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JackBean
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Post by JackBean » Mon Feb 07, 2011 7:58 pm

no, the answer should be transcription inhibition
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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Post by magicsiew » Tue Feb 08, 2011 2:22 pm

Duplex can be formed by few ways:
1. RNA dependent RNA Polymerase (RdR)
2. Single strand folded to become double strand
3. Retrotransposon

Depends on what kind of organism is it...

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Re: Sense effect of RNAi

Post by jonmoulton » Tue Feb 08, 2011 4:01 pm

As JackBean wrote, the sense RNA bound to Argonaute can affect transcription. I recall reading that Argonaute-RNA complexes can direct changes in methylation of RNA (or was it histone acetylation? It's been a few years since I read that). Either way, by changing the epigenetic state of a gene the Argonaute-RNA complex can change the transcription rate from that gene.

Other, less specific gene regulation can occur though innate immune responses to exogenous RNA:
Small interfering RNAs mediate sequence-independent gene suppression and induce immune activation by signaling through toll-like receptor 3. Kariko K, Bhuyan P, Capodici J, Weissman D. J Immunol. 2004 Jun 1;172(11):6545-9.

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