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2014 ; 15
(ä): 192
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Online GESS: prediction of miRNA-like off-target effects in large-scale RNAi
screen data by seed region analysis
#MMPMID24934636
Yilmazel B
; Hu Y
; Sigoillot F
; Smith JA
; Shamu CE
; Perrimon N
; Mohr SE
BMC Bioinformatics
2014[Jun]; 15
(ä): 192
PMID24934636
show ga
BACKGROUND: RNA interference (RNAi) is an effective and important tool used to
study gene function. For large-scale screens, RNAi is used to systematically
down-regulate genes of interest and analyze their roles in a biological process.
However, RNAi is associated with off-target effects (OTEs), including microRNA
(miRNA)-like OTEs. The contribution of reagent-specific OTEs to RNAi screen data
sets can be significant. In addition, the post-screen validation process is time
and labor intensive. Thus, the availability of robust approaches to identify
candidate off-targeted transcripts would be beneficial. RESULTS: Significant
efforts have been made to eliminate false positive results attributable to
sequence-specific OTEs associated with RNAi. These approaches have included
improved algorithms for RNAi reagent design, incorporation of chemical
modifications into siRNAs, and the use of various bioinformatics strategies to
identify possible OTEs in screen results. Genome-wide Enrichment of Seed Sequence
matches (GESS) was developed to identify potential off-targeted transcripts in
large-scale screen data by seed-region analysis. Here, we introduce a
user-friendly web application that provides researchers a relatively quick and
easy way to perform GESS analysis on data from human or mouse cell-based screens
using short interfering RNAs (siRNAs) or short hairpin RNAs (shRNAs), as well as
for Drosophila screens using shRNAs. Online GESS relies on up-to-date transcript
sequence annotations for human and mouse genes extracted from NCBI Reference
Sequence (RefSeq) and Drosophila genes from FlyBase. The tool also accommodates
analysis with user-provided reference sequence files. CONCLUSION: Online GESS
provides a straightforward user interface for genome-wide seed region analysis
for human, mouse and Drosophila RNAi screen data. With the tool, users can either
use a built-in database or provide a database of transcripts for analysis. This
makes it possible to analyze RNAi data from any organism for which the user can
provide transcript sequences.