The photocleavable cyclic oligonucleotide according to the invention is the one that possesses a base sequence having the hybridization ability toward DNA or RNA to targeted, and is further provided with the structure cyclized by a photocleavable group. Accordingly, the photocleavable cyclic oligonucleotide according to the invention, after having been introduced in vivo, is hardly susceptible to the nuclease decomposition reaction owing to its cyclic structure and thus it is capable of diffusing toward the predetermined sites in vivo with sufficient time. Moreover, by being irradiated with the light at an appropriate wavelength after a predetermined period of time, the photocleavable group as described above is cleaved photochemically, thus cutting the predetermined bond. This permits the oligonucleotide that was cyclic to be a linear oligonucleotide which expresses the function of an antisense oligonucleotide.
根据本发明的可光分解环状寡核苷酸是一种具有与目标 DNA 或 RNA 杂交能力的碱基序列,并进一步具有由可光分解基团环化的结构的寡核苷酸。因此,根据本发明的可光裂解环状寡核苷酸被引入体内后,由于其环状结构,几乎不易受到
核酸酶分解反应的影响,因此能够在体内以足够的时间扩散到预定位点。此外,在经过预定时间后,用适当波长的光照射,上述光可裂解基团就会被光
化学裂解,从而切断预定的键。这样,原本环状的寡核苷酸就变成了线性寡核苷酸,从而表达了反义寡核苷酸的功能。