High-throughput RNAi screening in vitro: from cell lines to primary cells

Area of Science:

• Molecular Biology
• Cell Biology
• Genomics

Background:

• Small interfering RNAs (siRNAs) are crucial tools for sequence-specific gene silencing in mammalian cells.
• siRNA libraries are used to identify genes involved in specific cellular functions.
• Efficient delivery of siRNAs to diverse cell types is essential for large-scale screening.

Purpose of the Study:

• To develop and optimize high-throughput siRNA delivery methods for both immortalized and primary cells.
• To enable genome-scale gene function analysis through efficient siRNA library screening.

Main Methods:

• Adapted chemical reverse transfection for immortalized adherent cell lines in a 96-well format.
• Developed electropermeabilization (electroporation) conditions for primary and recalcitrant cell types.
• Created a novel 96-well electroporation device for high-throughput screening of primary cells.

Main Results:

• Chemical reverse transfection proved fast, robust, and effective for many immortalized cell types.
• Electroporation facilitated efficient siRNA delivery to a broad range of primary and immortalized cells, including T-cells, hMSC, and HUVEC.
• The combined methods enable high-throughput siRNA delivery to virtually any cell type.

Conclusions:

• High-throughput chemical reverse transfection and electroporation significantly advance the capability for genome-scale gene function discovery.
• These optimized delivery methods facilitate comprehensive analysis of gene function across diverse cellular models.