Alternatively, a new version of a gene can also be created through reverse transcription: during gene expression, the mRNA is copied back into a sequence of DNA that is inserted into the genome.
其二,新的复本也可能透过反转录作用,表现出来的mRNA反转录成DNA序列,再插回组内,这种现象称为反转录移位(retrotransposition),细胞内称为长散布核子(LINE)的转位子活动时。