Quantitative analysis of chromatin compaction in living cells using FLIM-FRET.
Quantitative analysis of chromatin compaction in living cells using FLIM-FRET.
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DOI:
10.1083/jcb.200907029
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发表时间:
2009-11-16
期刊:
影响因子:
--
通讯作者:
Lamond AI
中科院分区:
文献类型:
--
作者:
Llères D;James J;Swift S;Norman DG;Lamond AI
FRET analysis of cell lines expressing fluorescently tagged histones on separate nucleosomes demonstrates that variations in chromosome compaction occur during mitosis. We present a quantitative Förster resonance energy transfer (FRET)–based assay using multiphoton fluorescence lifetime imaging microscopy (FLIM) to measure chromatin compaction at the scale of nucleosomal arrays in live cells. The assay uses a human cell line coexpressing histone H2B tagged to either enhanced green fluorescent protein (FP) or mCherry FPs (HeLaH2B-2FP). FRET occurs between FP-tagged histones on separate nucleosomes and is increased when chromatin compacts. Interphase cells consistently show three populations of chromatin with low, medium, or high FRET efficiency, reflecting spatially distinct regions with different levels of chromatin compaction. Treatment with inhibitors that either increase chromatin compaction (i.e., depletion of adenosine triphosphate) or decrease chromosome compaction (trichostatin A) results in a parallel increase or decrease in the FLIM–FRET signal. In mitosis, the assay showed variation in compaction level, as reflected by different FRET efficiency populations, throughout the length of all chromosomes, increasing to a maximum in late anaphase. These data are consistent with extensive higher order folding of chromatin fibers taking place during anaphase.
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DOI:
10.1083/jcb.153.7.1341
发表时间:
2001-06-25
期刊:
The Journal of cell biology
影响因子:
--
作者:
Kimura H;Cook PR
通讯作者:
Cook PR
影响因子:
5.6
作者:
Huynh, VAT;Robinson, PJJ;Rhodes, D
通讯作者:
Rhodes, D
影响因子:
7.5
作者:
Belmont, AS;Dietzel, S;Tumbar, T
通讯作者:
Tumbar, T
影响因子:
3.3
作者:
Cushman, I;Stenoien, D;Moore, MS
通讯作者:
Moore, MS
影响因子:
64.5
作者:
Gilbert, N;Boyle, S;Bickmore, WA
通讯作者:
Bickmore, WA