Schlosser C A, Steglich C, deWet J R, Scheffler I E
Proc Natl Acad Sci U S A. 1981 Feb;78(2):1119-23. doi: 10.1073/pnas.78.2.1119.
We report on the expression of thymidine kinase (tk) activity in synchronized populations of mouse cells that have been transformed to the tk+ phenotype with purified DNA from various sources or with metaphase chromosomes from human cells. The viral (herpes) tk gene is constitutively expressed but, in all other cases examined, the activity is regulated as in normal tk+ mouse cells: There is a dramatic increase at the beginning of the S-phase. This regulation is observed whether the transgenome is stably integrated into the host genome or whether it is still in an unstable nonintegrated state.
我们报告了在已用来自各种来源的纯化DNA或来自人类细胞的中期染色体转化为tk+表型的小鼠细胞同步群体中胸苷激酶(tk)活性的表达情况。病毒(疱疹)tk基因是组成型表达的,但在所有其他检测的情况下,其活性与正常tk+小鼠细胞一样受到调节:在S期开始时会急剧增加。无论转基因基因组是稳定整合到宿主基因组中,还是仍处于不稳定的非整合状态,都能观察到这种调节。