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2'-Fluoro-modified phosphorothioate oligonucleotide can cause rapid degradation of P54nrb and PSF.

Nucleic acids research (2015-04-10)
Wen Shen, Xue-Hai Liang, Hong Sun, Stanley T Crooke
ABSTRACT

Synthetic oligonucleotides are used to regulate gene expression through different mechanisms. Chemical modifications of the backbone of the nucleic acid and/or of the 2' moiety of the ribose can increase nuclease stability and/or binding affinity of oligonucleotides to target molecules. Here we report that transfection of 2'-F-modified phosphorothioate oligonucleotides into cells can reduce the levels of P54nrb and PSF proteins through proteasome-mediated degradation. Such deleterious effects of 2'-F-modified oligonucleotides were observed in different cell types from different species, and were independent of oligonucleotide sequence, positions of the 2'-F-modified nucleotides in the oligonucleotides, method of delivery or mechanism of action of the oligonucleotides. Four 2'-F-modified nucleotides were sufficient to cause the protein reduction. P54nrb and PSF belong to Drosophila behavior/human splicing (DBHS) family. The third member of the family, PSPC1, was also reduced by the 2'-F-modified oligonucleotides. Preferential association of 2'-F-modified oligonucleotides with P54nrb was observed, which is partially responsible for the protein reduction. Consistent with the role of DBHS proteins in double-strand DNA break (DSB) repair, elevated DSBs were observed in cells treated with 2'-F-modified oligonucleotides, which contributed to severe impairment in cell proliferation. These results suggest that oligonucleotides with 2'-F modifications can cause non-specific loss of cellular protein(s).

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Anti-GAPDH antibody, Mouse monoclonal, clone GAPDH-71.1, purified from hybridoma cell culture
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Anti-γ-Tubulin antibody, Mouse monoclonal, clone GTU-88, ascites fluid
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Anti-p54nrb/NonO Antibody, clone 78-1-C6, clone 78-1-C6, Upstate®, from mouse