The epigenome is a molecular marking system that controls gene expression without altering the DNA sequence.
Image credit: Dreamstime表观基是在不改变DNA序
提下控制基
表达
分子标记系统。
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,新基
复本也可能透过反转录作用,将基
表现出来
mRNA反转录成DNA序
,再插回基
组内,这种现象称为反转录移位(retrotransposition),发
在细胞内称为
散布核
子(LINE)
转位子活动时。
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