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Therapeutic potential of siRNA-mediated transcriptional gene silencing

Morris, K.V.

Biotechniques Suppl: 7-13

2006

ISSN/ISBN: 0736-6205
PMID: 16629382
Document Number: 595263
RNA interference (RNAi) and specifically the use of small interfering RNAs (siRNAs) represents a potentially new paradigm in gene knockout technology. Clearly siRNAs call be used to knockdown the expression of a targeted transcript in what has been termed posttranscriptional gene silencing (PTGS). While there are a plethora of reports applying siRNA-mediated PTGS the limitation of the duration of the effect remains. Recently, in human cells, siRNAs have been shown, similar to plants and Schizosaccharomyces pombe, to mediate transcriptional gene silencing (TGS). The observation that siRNAs can function in a TGS manner in human cells suggests that, similar to plants, human genes may also be able to be silenced more permanently via epigenetic modifications. The ramifications of siRNA-mediated TGS in humans suggest that longer term suppression of gene function can be obtained via siRNA-directed chromatin modifications. Undoubtedly the potential to employ siRNA technology is broader than once envisioned in human cells and suggests that siRNA-mediated TGS is not simply limited to PTGS. The potential to utilize siRNAs to direct epigenetic changes in local chromatin structure offers a new therapeutic avenue that could prove remarkably robust and of immeasurable therapeutic value in the directed control of target gene expression.

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