Polymer-monovalent salt-induced DNA compaction studied via single-molecule microfluidic trapping.

Polymer-monovalent salt-induced DNA compaction studied via single-molecule microfluidic trapping.
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通过单分子微流体捕获研究聚合物一价盐诱导的 DNA 压缩。

DOI:
10.1039/c2lc20880f
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发表时间:
2012
期刊:
影响因子:
6.1
通讯作者:
Muller,SusanJ
Muller,SusanJ
中科院分区:
工程技术1区
文献类型:
--
作者:
Xu,Weilin;Muller,SusanJ

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通过对DNA压实图像和时间轨迹的分析,研究了聚合物一价盐在微流控驻点流中诱导单分子DNA压实/凝聚。在整个DNA紧凑过程中,我们观察到了三个连续的步骤:步骤I,沿整个DNA链缓慢发生的拉伸DNA的松弛过程,步骤II,核的形成和生长,以及步骤III,对应于链的快速紧凑。在步骤I和步骤III之间观察到了记忆效应,并首次观察到了一种新的(入侵者诱导的)成核模式。这项研究扩大了微流控驻点流的使用范围,我们以前曾使用微流控驻点流进行序列检测和特定部位的酶动力学测量。
Polymer-monovalent salt-induced single-molecule DNA compaction/condensation in a microfluidic stagnation point flow was studied by analyzing both DNA compaction images and time trajectories. For the whole DNA compaction process we observed three successive steps: Step I, a relaxation process of the stretched DNA that occurs slowly along the whole DNA chain, Step II, nucleus formation and growth, and Step III, corresponding to a rapid compaction of the chain. A memory effect was observed between Steps I and III, and a new (intruder-induced) nucleation mode was observed for the first time. This study extends the use of the microfluidic stagnation point flow, which we have previously used for sequence detection and to measure enzyme kinetics site-specifically.
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