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Single Alkyl Phosphonate Modification of the siRNA Backbone in the Seed Region Enhances Specificity and Therapeutic Profile

GSE285764 Homo sapiens; Mus musculus Expression profiling by high throughput sequencing 110 samples Submitted 2025/01/15 Platform GPL24676Platform GPL24247
Summary
We evaluated the effect of alkyl phosphonate linkages in enhancing the specificity and therapeutic profile of siRNA when incorporated into the seed region. Modified siRNAs with a single alkyl phosphonate linkage demonstrated improved specificity, particularly when positioned at the internucleotide linkage between positions 6 and 7 from the 5'-end of the guide strand. These modifications maintained robust on-target activity both in vitro and in vivo while significantly reducing off-target effects, as shown by differential gene expression analysis. Additionally, we observed enhanced safety in mice, as evidenced by reduced ALT/AST elevation and the absence of histopathological changes.
Published in
Single alkyl phosphonate modification of the siRNA backbone in the seed region enhances specificity and therapeutic profile
Nikan M, Li Q, Tanowitz M et al. · Nucleic acids research 2025 · PMID 40737088 · doi:10.1093/nar/gkaf692
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Also filed as BioProject PRJNA1205781 and SRA study SRP555014. Searching any of these in the dataset finder brings you back here.

Study design
40 conditions, each sampled once — no replicated groups

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