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Going Beyond Terminal
Tm
In
addition to G/C content at the termini of the siRNAs, traits
that were found to be influential in defining optimal siRNA
sequences include the Tm of specific
internal domains of the siRNA, siRNA length, position of the
target sequence within the CDS (coding region) and nucleotide
content of the 3' overhangs. These findings are incorporated
into the Cenix algorithm used to design Ambion's Silencer
Pre-designed siRNAs and SilencerValidated
siRNAs as well as the Silencer
siRNA Libraries. The design process also includes a
specificity check whereby both siRNA strands are subjected to
customized homology searches to minimize risks of generating
off-target effects, and putative siRNA target sequences are
screened against the most updated single-nucleotide
polymorphism (SNP) databases to avoid variability in siRNA
efficacy. Target mRNA sequences known to mediate regulatory
processes through binding to protein factors are similarly
avoided, as are CpG motifs.
Concentrate on Your Experiments, Not on
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