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
中科院分区:
文献类型:
--
作者:
Streng DE;Lim SF;Pan J;Karpusenka A;Riehn R
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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