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Published on: June 4, 2012
Specific interference with gene expression induced by long, double-stranded RNA in mouse embryonal teratocarcinoma
1Friedrich Miescher Institute for Biomedical Research, P.O. Box 2543, 4002 Basel, Switzerland.
Summary
Long double-stranded RNA effectively triggers RNA interference (RNAi) in mouse cells, mediated by small interfering RNAs (siRNAs). This study demonstrates RNAi induction in embryonal carcinoma and stem cells, bypassing nonspecific effects.
Area of Science:
- Molecular Biology
- Gene Expression Regulation
- RNA Interference
Background:
- Double-stranded RNA (dsRNA) induces sequence-specific gene silencing via RNA interference (RNAi) in eukaryotes.
- While short interfering RNAs (siRNAs) are effective in mammalian cells, long dsRNA studies are hindered by nonspecific effects from PKR and RNase L.
- RNAi mechanisms in invertebrates differ from those in mammals, necessitating further investigation in mammalian systems.
Purpose of the Study:
- To investigate the efficacy of long dsRNA in inducing RNA interference in undifferentiated mouse cells.
- To characterize the mechanism of dsRNA-mediated gene silencing in mouse embryonal carcinoma (EC) and stem cells.
- To determine the role of siRNAs and Dicer in dsRNA-induced RNAi in these cell types.
Main Methods:
- Transfection of long dsRNA into mouse EC cell lines (P19, F9) and embryonic stem cells.
- Analysis of protein levels for sequence-specific gene expression inhibition.
- Biochemical assays using cell extracts to study dsRNA processing by Dicer.
- Localization studies of Dicer in EC and HeLa cells.
Main Results:
- Long dsRNA effectively induced sequence-specific gene silencing in cultured mouse EC and embryonic stem cells.
- The RNAi response was mediated by siRNAs generated through Dicer processing of dsRNA.
- Cell extracts demonstrated Dicer's ability to cleave dsRNA into approximately 23-nt fragments, and Dicer was localized to the cytoplasm.
Conclusions:
- Long dsRNA can effectively induce RNA interference in undifferentiated mouse cells, offering a viable tool for gene silencing studies.
- The mechanism involves Dicer-mediated processing of dsRNA into siRNAs, similar to pathways observed in other systems.
- This finding overcomes previous limitations associated with nonspecific effects, enabling robust RNAi applications in mammalian cell culture.
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