机构地区: 军事医学科学院放射与辐射医学研究所
出 处: 《中国生物化学与分子生物学报》 2002年第5期525-528,共4页
摘 要: RNA干扰作用 (RNAi)是生物界一种古老而且进化上高度保守的现象 ,是基因转录后沉默作用 (PTGS)的重要机制之一 .RNAi主要通过dsRNA被核酸酶切割成 2 1~ 2 5nt的干扰性小RNA即siRNA ,由siRNA介导识别并靶向切割同源性靶mRNA分子而实现 .RNAi要有多种蛋白因子以及ATP参与 ,而且具有生物催化反应特征 .RNAi是新发现的一种通过dsRNA介导的特异性高效抑制基因表达途径 。 RNA interference (RNAi) is the process of sequence-specific post-transcriptional gene silencing in animals and plants initiated by double-stranded RNA (dsRNA) that is homologous in sequence to the silenced gene. RNAi in diverse organisms reveals the same highly conserved mechanism with an ancient origin. The basic process in RNAi involves a dsRNA that is processed by endonuclease into small interfering RNA (siRNA) that guides recognition and targeted cleavage of homologous target mRNA. The discovery of RNAi and the following studies on the molecular mechanism under RNAi lead to the development of new strategies for blocking gene function and may yield RNA-based drugs to treat human disease.