2017
DOI: 10.15252/embj.201695842
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Chromatin stiffening underlies enhanced locus mobility afterDNAdamage in budding yeast

Abstract: DNA double-strand breaks (DSBs) induce a cellular response that involves histone modifications and chromatin remodeling at the damaged site and increases chromosome dynamics both locally at the damaged site and globally in the nucleus. In parallel, it has become clear that the spatial organization and dynamics of chromosomes can be largely explained by the statistical properties of tethered, but randomly moving, polymer chains, characterized mainly by their rigidity and compaction. How these properties of chro… Show more

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Cited by 66 publications
(129 citation statements)
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“…Chromatin dynamics therefore appears to be scale-dependent: in response to DNA damage, chromatin is more mobile at large time scales but, surprisingly, its mobility is reduced at short time scales, this effect being stronger at the damaged site. Such a pattern of dynamics is consistent with a global chromatin stiffness that has been proposed to arise in response to DNA damage [65,89,90]. These results underline the importance of performing multiscale tracking to fully understand the complex dynamics of chromatin at each scale.…”
Section: Local Versus Global Increased Mobilitysupporting
confidence: 81%
“…Chromatin dynamics therefore appears to be scale-dependent: in response to DNA damage, chromatin is more mobile at large time scales but, surprisingly, its mobility is reduced at short time scales, this effect being stronger at the damaged site. Such a pattern of dynamics is consistent with a global chromatin stiffness that has been proposed to arise in response to DNA damage [65,89,90]. These results underline the importance of performing multiscale tracking to fully understand the complex dynamics of chromatin at each scale.…”
Section: Local Versus Global Increased Mobilitysupporting
confidence: 81%
“…Two regions on the same DNA molecule are linked such that their relative motion is still random, but not independent of each other. Their relative motion is “subdiffusive.” Yeast chromosomes exhibit this subdiffusive behavior [63-66]. Both simulations and direct observations of fluorescently tagged immunoglobulin loci in mouse B cells lead to the same conclusion [67]: for sites that are within a radius of 1 micron (the size of the yeast nucleus), the mean free passage time (MFPT) is about 2100 sec (i.e.…”
Section: How Long Does the Search For Homology Take?mentioning
confidence: 94%
“…One modification is the phosphorylation of histone H2A (called γ-H2AX) that spreads for a distance of ~50 kb on either side of the DSB [74]. In cells lacking ATRMec1 or carrying a non-phosphorylatable histone H2A allele, Rc for a region near a DSB or the distance between two fluorescently marked sites around the DSB does not show the increases seen in wildtype cells [63, 68]. …”
Section: Changes In Chromosome Mobility May Facilitate Homology Searcmentioning
confidence: 99%
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