Specificity of Short Interfering RNA Determined Through Gene Expression Signatures

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2003 May 15

PMID 12746500

Citations 161

Authors

Dimitri Semizarov

Leigh Frost

Aparna Sarthy

Paul Kroeger

Donald N Halbert

Stephen W Fesik

Affiliations

Soon will be listed here.

Abstract

Short interfering RNA (siRNA) is widely used for studying gene function and holds great promise as a tool for validating drug targets and treating disease. A critical assumption in these applications is that the effect of siRNA on cells is specific, i.e., limited to the specific knockdown of the target gene. In this article, we characterize the specificity of siRNA by applying gene expression profiling. Several siRNAs were designed against different regions of the same target gene for three different targets. Their effects on cells were compared by using DNA microarrays to generate gene expression signatures. When the siRNA design and transfection conditions were optimized, the signatures for different siRNAs against the same target were shown to correlate very closely, whereas the signatures for different genes revealed no correlation. These results indicate that siRNA is a highly specific tool for targeted gene knockdown, establishing siRNA-mediated gene silencing as a reliable approach for large-scale screening of gene function and drug target validation.

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