Circadian rhythm of covalent modifications in liver DNA.

Circadian rhythm of covalent modifications in liver DNA.
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肝脏 DNA 共价修饰的昼夜节律。

DOI:
10.1016/0006-291x(92)91592-e
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发表时间:
1992
影响因子:
3.1
通讯作者:
Randerath,K
Randerath,K
中科院分区:
生物学4区
文献类型:
--
作者:
Nath,RG;Vulimiri,SV;Randerath,K

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摘要32 P-后标记分析最近发现,除了5-甲基胞嘧啶,哺乳动物DNA含有共价修饰的核苷酸未知的结构和功能称为I-化合物,其水平随年龄的增长而增加。此外,I-化合物水平取决于物种、品系、性别、组织和饮食,并且通常会因致癌物暴露而降低。如此处所示,与0600 h和1200 h相比,1800 h和2400 h未处理雄性C3 H小鼠肝脏DNA中几种非极性I化合物的水平升高2至8.5倍,而黄樟素诱导的极性I化合物和持久性致癌物-DNA加合物不受一天中时间的影响。在雄性F-344大鼠的肝脏DNA中,4种非极性I-化合物和4种极性I-化合物在2000 h与0800 h相比显示出显著的昼夜节律。这种新的昼夜变化的DNA结构意味着机制,精确地调节I-化合物在体内的水平,可以想象的是与DNA合成和基因表达的昼夜差异。
Abstract 32 P-postlabeling analysis recently revealed that in addition to 5-methylcytosine, mammalian DNA contains covalently modified nucleotides of unknown structures and functions termed I-compounds whose levels increase with age. I-compound levels, in addition, depend on species, strain, sex, tissue, and diet and are generally lowered by carcinogen exposure. As shown here, levels of several non-polar I-compounds in liver DNA of untreated male C3H mice were elevated 2 to 8.5 times at 1800 h and 2400 h as compared to 0600 h and 1200 h, while polar I-compounds and persistent carcinogen-DNA adducts induced by safrole were unaffected by time of day. In liver DNA of male F-344 rats 4 non-polar I-compounds and 4 polar I-compounds showed significant circadian rhythm at 2000 h compared to 0800 h. This novel circadian variation of DNA structure implies mechanisms precisely regulating I-compound levels in vivo and may conceivably be linked to diurnal differences of DNA synthesis and gene expression.
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