2017
DOI: 10.1093/nar/gkx562
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Regulation of chromatin folding by conformational variations of nucleosome linker DNA

Abstract: Linker DNA conformational variability has been proposed to direct nucleosome array folding into more or less compact chromatin fibers but direct experimental evidence for such models are lacking. Here, we tested this hypothesis by designing nucleosome arrays with A-tracts at specific locations in the nucleosome linkers to induce inward (AT-IN) and outward (AT-OUT) bending of the linker DNA. Using electron microscopy and analytical centrifugation techniques, we observed spontaneous folding of AT-IN nucleosome a… Show more

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Cited by 22 publications
(34 citation statements)
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References 70 publications
(122 reference statements)
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“…This observation was made for relatively short 20-and 25-bp linkers observed in yeast [39,40]. Recently, we corroborated this conclusion analyzing nucleosome arrays with 183-and 188-bp NRL [43], typical for higher eukaryotes (L = 36 and 41 bp).…”
Section: Topological Polymorphism Of Chromatin Fiberssupporting
confidence: 82%
“…This observation was made for relatively short 20-and 25-bp linkers observed in yeast [39,40]. Recently, we corroborated this conclusion analyzing nucleosome arrays with 183-and 188-bp NRL [43], typical for higher eukaryotes (L = 36 and 41 bp).…”
Section: Topological Polymorphism Of Chromatin Fiberssupporting
confidence: 82%
“…The first level of compaction involves wrapping 147 base pairs (bps) of DNA around a histone octamer, forming the nucleosome that repeatedly occurs across the genome. The precise locations of nucleosomes on genomic DNA influence higher-order chromatin structure [1] and regulates diverse cellular processes by controlling local DNA accessibility [2]. Specifically, it is believed that most DNA-binding proteins preferentially bind the unprotected linker DNA between nucleosomes.…”
Section: Introductionmentioning
confidence: 99%
“…For chromatin modeling, especially at small and intermediate scales, approaches that rely on basic physical interactions for the description of electrostatics and solvation are of uttermost importance. The other indisputably essential ingredient is the mechanical connection; for example, the presence of high-curvature AT-rich segments (A-tracts) in linker DNA is known to influence nucleosome interaction and alter chromatin folding (Buckwalter et al, 2017).…”
Section: Introductionmentioning
confidence: 99%