Replication independent formation of extrachromosomal circular DNA in mammalian cell-free system.

Replication independent formation of extrachromosomal circular DNA in mammalian cell-free system.
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DOI:
10.1371/journal.pone.0006126
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发表时间:
2009-07-01
期刊:
影响因子:
3.7
通讯作者:
Lavi S
Lavi S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Cohen Z;Lavi S

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染色体外环状DNA(Extrachromosomal circular DNA,eccDNA)是存在于所有真核细胞中的环状双链DNA分子,由重复的染色体序列组成。它被认为与基因组的不稳定性、衰老和选择性端粒延长有关。我们的研究提出了新的哺乳动物无细胞系统eccDNA的产生。使用纯化的蛋白质提取物,我们表明,eccDNA的形成不涉及从头DNA合成表明eccDNA是通过切除染色体序列产生的。这个过程是通过序列非依赖性酶进行的,因为人蛋白质提取物可以从高分子量小鼠DNA产生小鼠特异性eccDNA,反之亦然。EccDNA的产生不依赖于ATP,需要残留量的Mg2+,并通过双链DNA断裂来增强。
Extrachromosomal circular DNA (eccDNA) is a pool of circular double stranded DNA molecules found in all eukaryotic cells and composed of repeated chromosomal sequences. It was proposed to be involved in genomic instability, aging and alternative telomere lengthening. Our study presents novel mammalian cell-free system for eccDNA generation. Using purified protein extract we show that eccDNA formation does not involve de-novo DNA synthesis suggesting that eccDNA is generated through excision of chromosomal sequences. This process is carried out by sequence- independent enzymes as human protein extract can produce mouse- specific eccDNA from high molecular weight mouse DNA, and vice versa. EccDNA production does not depend on ATP, requires residual amounts of Mg2+ and is enhanced by double strand DNA breaks.
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