Antisense Effect of Oligodeoxynucleotides with Inverted Terminal Internucleotidic Linkages: A Minimal Modification Protecting against Nucleolytic Degradation

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Abstract
The synthesis of a new class of antisense oligonucleotide compounds with 3′-3′ and 5′-5′ end inversion (INV-oligonucleotides) is described. Besides the advantage of simplicity of synthesis, physico-chemical studies show that these compounds do not disturb Watson—Crick base-pairing. INV-oligonucleotides have a half-life of 30 h in human serum. We show that they are capable of inhibiting SV40 large T-antigen expression in COS-1 cells, both in vitro and in vivo, and by modulation of the expression of cellular oncoprotein p53 in vitro.