Role of RNase H in Hybrid-Arrested Translation by Antisense Oligonucleotides

The mechanism of hybrid-arrested translation by antisense oligodeoxynucleotides has been investigated with the rabbit reticulocyte lysate system. The oligonucleotides studied were directed against different regions of mouse α - or β -globin mRNAs. Freshly prepared reticulocyte lysates were found to contain 1-2% of the level of RNase H in nucleated cells. This level of activity was sufficient to cleave nearly 100% of the targeted mRNA at the site of hybridization with a complementary oligodeoxynucleotide in 1 hr under conditions of active translation. Using poly(rA)· oligo(dT) as a competitive inhibitor of the enzyme, hybrid arrest by oligodeoxynucleotides complementary to the sequence spanning the initiation codon or to a sequence in the coding region was found to be due entirely to cleavage of mRNA by RNase H. Hybridization of oligodeoxynucleotides adjacent to the cap site of β -globin mRNA, but not the α -globin mRNA, also inhibited protein synthesis directly. Even in this case, however, cleavage of the mRNA by RNase H was the predominant pathway of inhibition.