其中，同源依赖的基因沉默又可以分为转录水平的基因沉默和转录后水平的基因沉默。

• Homology-dependent gene silencing (HdGS), which is the generic term for transcriptional gene silencing (TGS), post-transcriptional gene silencing (PTGS) and RNAmediated virus-resistance (RmVR) have been shown to frequently occur in transgenic plants.