title: Target gene abundance contributes to the efficiency of siRNA-mediated gene silencing.
abstract: The gene-silencing activity of a small interfering RNA (siRNA) is determined by various factors. Considering that RNA interference (RNAi) is an unparalleled technology in both basic research and therapeutic applications, thorough understanding of the factors determining RNAi activity is critical. This report presents observations that siRNAs targeting KRT7 show cell-line-dependent activity, which correlates with the expression level of KRT7 mRNA. By modulating the target mRNA level, it was confirmed that highly expressed genes are more susceptible to siRNA-mediated gene silencing. Finally, several genes that show different expression levels in a cell-line dependent manner were tested, which verified the expression-level-dependent siRNA activities. These results strongly suggest that the abundance of target mRNA is a critical factor that determines the efficiency of the siRNA-mediated gene silencing in a given cellular context. This report should provide practical guidelines for designing RNAi experiments and for selecting targetable genes in RNAi therapeutics studies.
authors: 1 Global Research Laboratory for RNAi Medicine, Department of Chemistry, Sungkyunkwan University , Suwon, Korea.
authors: Sun Woo
authors: SW
authors: Hong
authors: Yuanyuan
authors: Y
authors: Jiang
authors: Soyoun
authors: S
authors: Kim
authors: Chiang J
authors: CJ
authors: Li
authors: Dong-ki
authors: DK
authors: Lee
mesh_terms: D045744:Cell Line, Tumor; D018628:Gene Dosage; D005786:Gene Expression Regulation; D020868:Gene Silencing; D017930:Genes, Reporter; D006801:Humans; D053552:Keratin-7 / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000378:metabolism; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D009928:Organ Specificity; D012333:RNA, Messenger / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000378:metabolism; D034741:RNA, Small Interfering / Q000235:genetics* / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: C507497:KRT7 protein, human; D053552:Keratin-7; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D011993:Recombinant Fusion Proteins; D008156:Luciferases