第9章 基因表达调控及表观遗传学.pdf

2014/12/1 基因表达(gene expression)是指基因通过转录 和转译而产生蛋白质产物或转录后直接产生其RNA 第九章 终产物如rRNA，tRNA等的过程。在这一过程中，基 因的启动和关闭、活性的增加与减弱等都是受到严 基因表达调控及表观遗传学 格的调控的。 不同类型的细胞在不同的发育阶段和不同的 环境需求而需要表达不同的信息，这就需要 贺竹梅 基因表达调控(gene regulation) ： 细胞用来控制各基因产物的量及产出的 时间和表达的空间。。 • Some scientists are now focusing their efforts on cloning members of endangered species. • The use of cloning to repopulate endangered species holds tremendous promise. However, cloning may also create new problems. Copyright © 2007 Pearson Education Inc., publishing as Pearson Benjamin Cummings 1 2014/12/1 How and Why Genes Are Regulated  Four of the many different types of human cells: In cellular differentiation, They all share the same genome. What makes them different? Certain genes are turned on and off. Cells become specialized in structure