Oligonucleotides comprising a ligand tethered to a modified or non-natural nucleobase
申请人:Manoharan Muthiah
公开号:US20070054279A1
公开(公告)日:2007-03-08
One aspect of the present invention relates to a double-stranded oligonucleotide comprising at least one ligand tethered to an altered or non-natural nucleobase. In certain embodiments, the non-natural nucleobase is difluorotolyl, nitropyrrolyl, or nitroimidazolyl. In certain embodiments, the ligand is a steroid or aromatic compound. In certain embodiments, only one of the two oligonucleotide strands comprising the double-stranded oligonucleotide contains a ligand tethered to an altered or non-natural nucleobase. In certain embodiments, both of the oligonucleotide strands comprising the double-stranded oligonucleotide independently contain a ligand tethered to an altered or non-natural nucleobase. In certain embodiments, the oligonucleotide strands comprise at least one modified sugar moiety. Another aspect of the present invention relates to a single-stranded oligonucleotide comprising at least one ligand tethered to an altered or non-natural nucleobase. In certain embodiments, the non-natural nucleobase is difluorotolyl, nitropyrrolyl, or nitroimidazolyl. In certain embodiments, the ligand is a steroid or aromatic compound. In certain embodiments, the ribose sugar moiety that occurs naturally in nucleosides is replaced with a hexose sugar, polycyclic heteroalkyl ring, or cyclohexenyl group. In certain embodiments, at least one phosphate linkage in the oligonucleotide has been replaced with a phosphorothioate linkage.
本发明的一个方面涉及一种双链寡核苷酸,其中至少一个配体被系在改变或非天然核碱基上。在某些实施例中,非天然核碱基是二氟基甲苯基、硝基吡咯基或硝基咪唑基。在某些实施例中,配体是类固醇或芳香化合物。在某些实施例中,只有双链寡核苷酸中的两个寡核苷酸链之一包含系在改变或非天然核碱基上的配体。在某些实施例中,双链寡核苷酸中的两个寡核苷酸链都独立地包含系在改变或非天然核碱基上的配体。在某些实施例中,寡核苷酸链包括至少一个修饰糖基。本发明的另一个方面涉及一种单链寡核苷酸,其中至少一个配体被系在改变或非天然核碱基上。在某些实施例中,非天然核碱基是二氟基甲苯基、硝基吡咯基或硝基咪唑基。在某些实施例中,配体是类固醇或芳香化合物。在某些实施例中,核苷酸中自然存在的核苷糖被替换为六糖、多环杂基烷基环或环己烯基团。在某些实施例中,寡核苷酸中至少一个磷酸酯键被磷酸硫酯键所替代。