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ADP-ribose polymer depletion leads to nuclear Ctcf re-localization and chromatin rearrangement

Guastafierro, T and Catizone, A and Calabrese, R and Zampieri, M and Martella, O and Bacalini, MG and Reale, A and Di Girolamo, M and Miccheli, M and Farrar, D and Klenova, E and Ciccarone, F and Caiafa, P (2013) 'ADP-ribose polymer depletion leads to nuclear Ctcf re-localization and chromatin rearrangement.' Biochemical Journal, 449 (3). 623 - 630. ISSN 0264-6021

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Abstract

Ctcf (CCCTC-binding factor) directly induces Parp [poly(ADPribose) polymerase] 1 activity and its PARylation [poly(ADPribosyl) ation] in the absence of DNA damage. Ctcf, in turn, is a substrate for this post-synthetic modification and as such it is covalently and non-covalently modified by PARs (ADP-ribose polymers). Moreover, PARylation is able to protect certain DNA regions bound by Ctcf from DNA methylation. We recently reported that de novo methylation of Ctcf target sequences due to overexpression of Parg [poly(ADP-ribose)glycohydrolase] induces loss of Ctcf binding. Considering this, we investigate to what extent PARP activity is able to affect nuclear distribution of Ctcf in the present study. Notably, Ctcf lost its diffuse nuclear localization following PAR (ADP-ribose polymer) depletion and accumulated at the periphery of the nucleus where it was linked with nuclear pore complex proteins remaining external to the perinuclear Lamin B1 ring. We demonstrated that PAR depletion-dependent perinuclear localization of Ctcf was due to its blockage from entering the nucleus. Besides Ctcf nuclear delocalization, the outcome of PAR depletion led to changes in chromatin architecture. Immunofluorescence analyses indicated DNA redistribution, a generalized genomic hypermethylation and an increase of inactive compared with active chromatin marks in Parg-overexpressing or Ctcf-silenced cells. Together these results underline the importance of the cross-talk between Parp1 and Ctcf in the maintenance of nuclear organization. © The Authors Journal compilation © 2013 Biochemical Society.

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health > Life Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 13 Mar 2013 14:02
Last Modified: 06 Sep 2019 11:15
URI: http://repository.essex.ac.uk/id/eprint/5831

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