首页> 外文期刊>Mutation Research, C. Mutation Research Letters >PERSISTENCE OF INCREASED LEVELS OF RIBOSOMAL GENE ACTIVITY IN CHO-K1 CELLS TREATED IN VITRO WITH DEMETHYLATING AGENTS
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PERSISTENCE OF INCREASED LEVELS OF RIBOSOMAL GENE ACTIVITY IN CHO-K1 CELLS TREATED IN VITRO WITH DEMETHYLATING AGENTS

机译:脱甲基化剂体外处理的CHO-K1细胞中核糖体基因活性水平的持久性

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The rate of ribosomal gene activity was evaluated by silver staining of the Nucleolus Organisers (NOs) in cultured CHO-K1 cells after a 12h pulse with two demethylating agents (L-ethionine and 5-azacytidine). Silver staining of the NOs was measured every 24h, from 24 up to 110h after seeding. The purpose was to test the hypothesis that drug-induced demethylation is associated to heritable modifications of rDNA activity. Ribosomal gene activity was shown to be significantly increased by both agents. The increase persisted throughout the experiments, thereby suggesting the heritability of this epigenetic modification. The analysis of heritable DNA damage or modification is an important task in studying the risk of cancer onset and the mechanisms of cancer induction. In these studies two main results were obtained: (i) heritable DNA variations can be induced by both mutational and epigenetic changes; (ii) the modified end-point was not negatively selected.
机译:核糖体基因活性的速率通过用两种脱甲基剂(L-乙硫氨酸和5-氮杂胞苷)在12h脉冲后对培养的CHO-K1细胞中的核仁组织者(NOs)进行银染来评估。从播种后24至110小时每24小时测量一次NO的银染。目的是检验药物诱导的去甲基化与rDNA活性的遗传修饰有关的假设。两种试剂均显示核糖体基因活性显着增加。这种增加在整个实验过程中一直存在,从而表明了这种表观遗传修饰的遗传性。可遗传的DNA损伤或修饰的分析是研究癌症发病风险和癌症诱导机制的重要任务。在这些研究中,获得了两个主要结果:(i)突变和表观遗传变化均可诱导可遗传的DNA变异; (ii)修改后的端点未被否定选择。

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