硫代磷酸酯修饰的反义寡核苷酸 (PS-ASO) 可以通过与靶 RNA 杂交并随后被 RNase H1 切割来降低基因表达。通过这种机制减少靶点受到 RNA 的许多特征的影响,这些特征调节 PS-ASO 与 RNA 靶点的结合亲和力,以及 PS-ASO-RNA 杂合体如何被 RNase H1 识别以进行 RNA 切割。内源性 RNA 经常经过化学修饰,可以调节 RNA 的分子内和分子间相互作用。PS-ASO 修饰对反义活性的影响已得到充分研究;然而,关于 RNA 修饰对 PS-ASO 杂交和 RNase H1 切割活性的影响知之甚少。这里,我们确定了三种不同 RNA 修饰对重组和基于细胞的系统中 PS-ASO 结合和反义活性的影响。一些 RNA 修饰可以降低 PS-ASO 杂交、RNase H1 的切割活性或两者兼而有之,而其他修饰对 PS-ASO 功能的影响最小。除了这些直接影响外,RNA 修饰还可以改变 RNA 结构,这可能会影响 PS-ASO 在细胞环境中的可及性。我们的研究结果阐明了三种流行的 RNA 修饰对 PS-ASO 介导的 RNase H1 切割活性的影响,这些发现将有助于改善 PS-ASO 靶位点选择。RNA 修饰也可以改变 RNA 结构,这可能会影响 PS-ASO 在细胞环境中的可及性。我们的研究结果阐明了三种流行的 RNA 修饰对 PS-ASO 介导的 RNase H1 切割活性的影响,这些发现将有助于改善 PS-ASO 靶位点选择。RNA 修饰也可以改变 RNA 结构,这可能会影响 PS-ASO 在细胞环境中的可及性。我们的研究结果阐明了三种流行的 RNA 修饰对 PS-ASO 介导的 RNase H1 切割活性的影响,这些发现将有助于改善 PS-ASO 靶位点选择。
"点击查看英文标题和摘要"
RNA modifications can affect RNase H1-mediated PS-ASO activity
Phosphorothioate modified antisense oligonucleotides (PS-ASOs) can reduce gene expression through hybridization to target RNAs and subsequent cleavage by RNase H1. Target reduction through this mechanism is influenced by numerous features of the RNA, which modulate PS-ASO binding affinities to the RNA target, and how the PS-ASO-RNA hybrid is recognized by RNase H1 for RNA cleavage. Endogenous RNAs are frequently chemically modified, which can regulate intra- and intermolecular interactions of the RNA. The effects of PS-ASO modifications on antisense activity have been well studied; however, much less is known regarding the effects of RNA modifications on PS-ASO hybridization and RNase H1 cleavage activity. Here, we determine the effects of three different RNA modifications on PS-ASO binding and antisense activity in recombinant and cell-based systems. Some RNA modifications can reduce PS-ASO hybridization, the cleavage activity of RNase H1, or both, while other modifications had minimal effects on PS-ASO function. In addition to these direct effects, RNA modifications can also change the RNA structure, which may affect PS-ASO accessibility in a cellular context. Our results elucidate the effects of three prevalent RNA modifications on PS-ASO-mediated RNase H1 cleavage activity, and such findings will help improve PS-ASO target site selection.