RNA干涉机制研究进展

RNA干涉(RNAi)是近年来的研究热点,相关综述有很多。但随着研究的不断深入,RNAi的作用机制和影响变得越来越复杂,以致难以简单而准确地定义RNAi。新的研究发现主要有:(1)RNAi在异染色质形成中有重要作用,并影响染色质修饰的分布,如组蛋白H3K9甲基化和DNA甲基化。(2)在RNAi中会产生二级siRNA,使干涉效果增强;二级siRNA为不同的Argonaute家族蛋白所结合,其作用机制更加复杂。(3)新鉴定出具有RNAi作用的小RNA,如rasiRNA和piRNA,其产生和作用机制都与dsRNA和siRNA有所不同。此外,论文还介绍了RNAi在治疗癌症和人畜传染病等方面的应用,并对应用中出现的问题进行了讨论。

The Influence of RNA Secondary Structure on the Efficiency of si RNA Silencing

In the application of RNAi technology,it is an essential step to design siR NA applicable to target gene.At present,there are many researches and conclusions on siR NA design.This paper aims to the influences of mR NA secondary structure or siR NA antisense-strand secondary structure on siR NA silence efficiency.The paper also discusses the problems and sets out further insights in the research.