Abstract
Novel 2'-O,4'-C-ethylene nucleosides have been synthesized as building blocks for antisense and antigene oligonucleotides. 2'-O,4'-C-Ethylene-bridged nucleic acids (ENA) comprising 2'-O,4'-C-ethylene nucleosides have considerable affinity to complementary RNA and double-stranded DNA. Incorporation of 2'-O,4'-C-ethylene nucleosides into oligonucleotides dramatically increase their resistance against exonucleases. In this review, the properties of ENA oligonucleotides and some of their applications as antisense and antigene oligonucleotides are described.
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