A probability-based approach for the analysis of large-scale RNAi screens

Nat Methods. 2007 Oct;4(10):847-9. doi: 10.1038/nmeth1089. Epub 2007 Sep 9.


We describe a statistical analysis methodology designed to minimize the impact of off-target activities upon large-scale RNA interference (RNAi) screens in mammalian cells. Application of this approach enhances reconfirmation rates and facilitates the experimental validation of new gene activities through the probability-based identification of multiple distinct and active small interfering RNAs (siRNAs) targeting the same gene. We further extend this approach to establish that the optimal redundancy for efficacious RNAi collections is between 4-6 siRNAs per gene.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Probability
  • RNA Interference*
  • RNA, Small Interfering / genetics*


  • RNA, Small Interfering