With the development of genetic engineering,more and more researchers pay attention to transgene silencing. Gene silencing takes place at transcriptional and post|transcriptional levels,and it is homology|dependent.Transgene silencing includes the inactivation of tandem repeats,trans|inactivation of allelic or ectopic copies,the coordinated silencing of a transgene and the endogenous homologous gene,and the cosuppression of RNA virus and the homologous transgene.There are different molecular mechanisms that induce gene silencing. Tansgene silencing is adapted as a procedure for virus|defence c...
