Specific growth inhibitory sequences in genomic DNA from quiescent human embryo fibroblasts.

Specific growth inhibitory sequences in genomic DNA from quiescent human embryo fibroblasts.
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来自静止人类胚胎成纤维细胞的基因组 DNA 中的特定生长抑制序列。

DOI:
10.1128/mcb.7.5.1894
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发表时间:
1987
影响因子:
5.3
通讯作者:
B. Howard
B. Howard
中科院分区:
生物学2区
文献类型:
--
作者:
R. Padmanabhan;T. Howard;B. Howard

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我们使用HeLa细胞作为受体进行基因转移实验,以表征负调控哺乳动物细胞生长的DNA序列。在这个实验中,来自静止的人胚胎成纤维细胞的基因组DNA比来自大肠杆菌或HeLa细胞的DNA更能抑制HeLa的复制。令人惊讶的是,生长抑制活性取决于制备基因组DNA的细胞的生长状态;在从无血清的静止胚胎成纤维细胞中制备的DNA中最强。后一种观察结果暗示了DNA修饰在调节我们实验中检测到的抑制序列活性中的作用。观察到的生长抑制活性水平有时很高,这表明相关序列可能在哺乳动物基因组中大量存在。我们推测这些发现可能为细胞静止和体外衰老的分子机制提供新的见解。
We used HeLa cells as recipients in a gene transfer assay to characterize DNA sequences that negatively regulate mammalian cell growth. In this assay, genomic DNA from quiescent human embryo fibroblasts was more inhibitory for HeLa replication than was DNA from either Escherichia coli or HeLa cells. Surprisingly, growth inhibitory activity depended on the growth state of the cells from which genomic DNA was prepared; it was strongest in DNA prepared from serum-deprived, quiescent embryo fibroblasts. This latter observation implies a role for DNA modification(s) in regulating the activity of the inhibitory sequences detected in our assay. The level of the observed growth inhibitory activity was sometimes high, suggesting that the relevant sequences may be abundantly represented in the mammalian genome. We speculate that these findings may provide new insights into the molecular mechanisms involved in cellular quiescence and in vitro senescence.
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