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A foamy virus vector system for stable and efficient RNAi expression in mammalian cells
Magdalini Papadaki1, Elena Konstantina Siapati, George Vassilopoulos
1Division of Genetics and Gene Therapy, Center for Basic Research II, Biomedical Research Foundation of the Academy of Athens, Athens, Greece.
Human Gene Therapy
|April 5, 2011
Summary
Foamy virus (FV) vectors enable stable RNA interference (RNAi) for efficient gene silencing. The H1 promoter demonstrated superior performance in human cells, while both promoters showed efficacy in mouse hematopoietic stem cells (HSCs) in vivo.
Area of Science:
- Molecular Biology
- Gene Therapy
- Virology
Background:
- RNA interference (RNAi) is crucial for gene silencing, but its efficiency and stability depend on the vector system.
- Foamy virus (FV) vectors offer a safe alternative for viral gene transfer.
- RNA polymerase III (Pol III) promoters are essential for expressing small interfering RNAs (siRNAs) used in RNAi.
Purpose of the Study:
- To develop and evaluate foamy virus (FV) vectors for stable RNA interference (RNAi).
- To compare the efficiency of mouse U6 (mU6) and human H1 Pol III promoters in FV vectors for gene silencing.
- To assess the in vitro and in vivo performance of these vectors in human cell lines and mouse hematopoietic stem cells (HSCs).
Main Methods:
- Development of FV vectors utilizing mU6 and H1 Pol III promoters to express short hairpin RNA (shRNA).
- Transduction of human cell lines and mouse HSCs with FV vectors.
- Evaluation of gene silencing efficiency using green fluorescent protein as a target gene.
- Assessment of vector stability and efficacy in vivo following bone marrow transplantation in mice.
- Silencing of BCR-ABL in K562 cells to confirm vector functionality.
Main Results:
- Both mU6 and H1 FV vectors achieved highly efficient gene silencing, even at low vector copy numbers.
- FV vectors with the H1 promoter showed better cell survival in human cell lines compared to mU6 vectors.
- mU6 FV vectors demonstrated efficient and stable gene silencing in mouse HSCs post-bone marrow transplantation.
- The H1 FV vectors successfully silenced the BCR-ABL oncogene in K562 cells.
Conclusions:
- FV vectors are effective for stable RNAi-mediated gene silencing.
- The choice of Pol III promoter (mU6 vs. H1) influences RNAi outcomes in different cellular contexts.
- FV vectors, particularly those using the H1 promoter, represent a promising tool for gene therapy applications, including in HSCs.
- This study provides the first in vivo validation of RNAi gene silencing in HSCs using FV vectors.
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