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Screening of siRNA target sequences by using fragmentized DNA
Vivi Kasim1, Kazunari Taira, Makoto Miyagishi
1Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, Hongo, Tokyo 113-8656, Japan.
The Journal of Gene Medicine
|March 15, 2006
Summary
This study introduces a novel system for selecting effective short interfering RNA (siRNA) target sequences in mammals. The method efficiently identifies potent siRNA sequences while also flagging those that may cause cytotoxicity.
Area of Science:
- Molecular Biology
- Genetics
- Biotechnology
Background:
- RNA interference (RNAi) is a key method for gene silencing.
- Short interfering RNA (siRNA) is used to induce RNAi in mammalian cells.
- siRNA efficacy is highly dependent on target sequence selection.
Purpose of the Study:
- To develop an efficient system for selecting optimal siRNA target sequences.
- To identify potent siRNA sequences for gene silencing in mammals.
- To simultaneously screen for potentially cytotoxic sequences.
Main Methods:
- Construction of parallel-type siRNA expression vector libraries.
- Utilizing fragmentized target genes for library construction.
- Employing a group selection system for screening.
- Using DsRed and GFP reporter genes as a model system.
Main Results:
- Successfully identified highly effective siRNA target sequences.
- Screened over 100 random siRNA expression plasmids per target gene.
- Discovered clones expressing dsRNAs of varying lengths.
- Identified potential cytotoxic dsRNA-expressing clones.
Conclusions:
- The developed system enables efficient screening of potent siRNA target sequences.
- The system can identify sequences for any gene, even without prior full sequence knowledge.
- It allows for the identification and avoidance of cytotoxic target sequences.
