Stretching chromatin through confinement.

Stretching chromatin through confinement.
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DOI:
10.1039/b909217j
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发表时间:
2009-10-07
期刊:
影响因子:
6.1
通讯作者:
Riehn R
Riehn R
中科院分区:
工程技术1区
文献类型:
--
作者:
Streng DE;Lim SF;Pan J;Karpusenka A;Riehn R

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我们提出了一种在纳米流体通道中拉伸染色质分子的方法,该通道宽度约为80×80 nm 2,长度为数百微米。染色质的拉伸到约12个碱基对/nm使得能够以高达6 kbp的分辨率对核酸材料进行位置分辨的光学研究。拉伸是基于当聚合物被引入比对应于整个染色质分子的Flory卷曲更窄的纳米流体通道时聚合物经历的平衡伸长。我们研究重组染色质的伸长是否可以用de Gennes模型来描述。我们比较了裸DNA和相同基因组长度的染色质的纳米流体拉伸,发现染色质在其拉伸状态下更紧凑2.5倍。
We present a method for the stretching of chromatin molecules in nanofluidic channel width a cross-section of about 80×80 nm2, and hundreds of microns long. The stretching of chromatin to about 12 basepairs/nm enables location-resolved optical investigation of the nucleic material with a resolution of up to 6 kbp. The stretching is based on the equilibrium elongation that polymers experience when they are introduced into nanofluidic channels that are narrower than the Flory coil corresponding to the whole chromatin molecule. We investigate whether the elongation of reconstituted chromatin can be described by the de Gennes model. We compare nanofluidic stretching of bare DNA and chromatin of equal genomic length, and find that chromatin is 2.5 times more compact in its stretched state.
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