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Improved silencing vector co-expressing GFP and small hairpin RNA
Shin-ichiro Kojima1, Danijela Vignjevic, Gary G Borisy
1Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, 303 E. Chicago Ave., Chicago, IL 60611, USA. s-kojima@northwestern.edu
Biotechniques
|January 27, 2004
Summary
We developed pG-SUPER, a novel vector for gene silencing using small interfering RNA (siRNA). This tool reliably detects gene knockdown and rescued cells, improving siRNA research applications.
Area of Science:
- Molecular Biology
- Genetics
Background:
- Small interfering RNA (siRNA) is a key technology for targeted gene expression silencing.
- Accurate assessment of gene knockdown efficiency and cell sorting remains a challenge in siRNA research.
Purpose of the Study:
- To develop an improved vector, pG-SUPER, for simultaneous co-expression of green fluorescent protein (GFP) and small hairpin RNA (shRNA).
- To establish a reliable method for detecting and isolating gene knockdown cells for further analysis.
- To evaluate the utility of pG-SUPER in assessing gene replacement strategies.
Main Methods:
- Development of the pG-SUPER vector for co-expressing GFP and shRNA.
- Utilizing GFP as a reporter for gene silencing efficiency in HeLa cells.
- Employing fluorescent-activated cell sorting (FACS) to purify cells with high knockdown levels.
- Western blotting to confirm protein depletion in sorted cell populations.
- Assessing gene replacement efficacy using siRNA-resistant rescue genes.
Main Results:
- GFP expression served as a highly reliable indicator (93%-98%) of significant lamin A/C knockdown (approx. 90%).
- FACS enabled efficient purification of knockdown cells, facilitating downstream protein analysis.
- Western blotting confirmed successful target protein depletion in purified cell populations.
- The pG-SUPER system accurately quantified gene replacement, showing a linear correlation between rescue gene expression and protein recovery.
Conclusions:
- The pG-SUPER vector provides a robust and efficient system for monitoring gene silencing via GFP co-expression.
- GFP reporter-mediated FACS significantly streamlines the analysis of siRNA-mediated knockdown.
- pG-SUPER facilitates the evaluation of gene replacement strategies, expanding the utility of plasmid-based siRNA applications.