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SEC Validation
The Silencer Express Kits have been used to
create SECs targeting to GAPDH, c-fos, cyclophilin, PKC-alpha, -actin,
and Green Fluorescent Protein (GFP). In all cases, SECs were able to reduce
target gene expression. Figures 14 and 6 show several examples. Furthermore,
SECs targeting GAPDH were functional in HeLa, 293, Cos7, Du145, HepG2,
NIH3T3, MCF7 and A549 cells, confirming that PCR products can be transfected
and transcribed in different cell types. Because they are simple to prepare,
SECs provide an ideal way to screen potential siRNA sequences for the
best siRNA sequence-promoter combination for DNA-based RNAi experiments
in diverse cell lines. For additional information and data, click here.
Figure 6. Effectiveness
of RNA Pol III Promoters with Altered 3' Ends. siRNA
Expression Cassettes featuring the human U6 (Hu-U6) and human H1 (Hu-H1)
promoters and expressing Negative Control (scrambled), GAPDH-, and cyclophilin-specific
hairpin siRNAs were transfected into 293 cells. 72 hours post-transfection,
the cells were processed to recover total RNA. Approximately 500 ng of
total RNA from each sample was assessed by Northern analysis. Radiolabeled
RNA probes targeting 28S rRNA, GAPDH, and cyclophilin were used to detect
target genes and normalize levels of input RNA. Films were exposed to
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