Oligonucleotide analogs having one or more substitute linkages of the formula 2'/3'--S--CH.sub.2 --CH.dbd.5' or 2'/3'--O--CH.sub.2 --CH.dbd.5' between adjacent nucleomonomers are disclosed. The substitute linkage replace the usual phosphodiester linkage found in unmodified nucleic acids. The oligonucleotide analogs are easy to synthesize, stable in vivo, resistant to endogenous nucleases and are able to hybridize to target nucleic acid sequences in a sequence specific manner.
披露了一种寡核苷酸类似物,具有一个或多个相邻核苷单体之间的2'/3'-S-
CH2-CH═5'或2'/3'-O- -CH═5'替代连接。这些替代连接取代了未修饰核酸中常见的
磷酯键连接。这些寡核苷酸类似物易于合成,在体内稳定,对内源
核酸酶具有抗性,并且能够以序列特异性的方式与目标核酸序列杂交。