Nucleic Acids Research, 1989, Vol. 17, No. 11 4255-4273
© 1989
MOLECULAR BIOLOGY |
Comparative inhibition of rabbit globin mRNA translation by modified antisense oligodeoxynucleotides
1Centre de Biophysique Moléculaire CNRS, F-5071 Orléans cedex, France 2Medicine Branch, National Cancer Institute NIH, Bethesda, MD 20892, USA Laboratoire de Biophysique INSERM U201, CNRS UA 481, Muséum National d'Histoire Naturelle, 43 rue Cuvier, F-75231 Pans cedex 5
Received February 28, 1989. Revised May 8, 1989. Accepted May 8, 1989.
We have studied the translation of rabbit globin mRNA in cell free systems (reticulocyte lysate and wheat germ extract) and in microinjected Xenopus oocytes in the presence of anti-sense oligodeoxynucleotides. Results obtained with the unmodified all-oxygen compounds were compared with those obtained when phosphorothioate or
-DNA was used. In the wheat germ system a 17-mer sequence targeted to the coding region of ß-globin mRNA was specifically inhibitory when either the unmodified phosphodiester oligonucleotide or its phosphorothioate analogue were used. In contrast no effect was observed with the
-oligomer. These results were ascribed to the fact that phosphorothioate oligomers elicit an RNase-H activity comparable to the all-oxygen congeners, while
-DNA/mRNA hybrids were a poor substrate. Microinjected Xenopus oocytes followed a similar pattern. The phosphorothioate oligomer was more efficient to prevent translation than the unmodified 17-mer. Inhibition of ß-globin synthesis was observed in the nanomolar concentration range. This result can be ascribed to the nuclease resistance of phosphorothioates as compared to natural phosphodiester linkages,
-oligomers were devoid of any inhibitory effect up to 30 µM. Phosphorothioate oligodeoxyribonucleotides were shown to be non-specific inhibitors of protein translation, at concentrations in the micromolar range, in both cell-free systems and oocytes. Non-specific inhibition of translation was dependent on the length of the phosphorothioate oligomer. These non-specific effects were not observed with the unmodified or the
-oligonucleotides.
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