Skip to Main content Skip to Navigation
New interface
Journal articles

ADP-ribose polymers localized on Ctcf-Parp1-Dnmt1 complex prevent methylation of Ctcf target sites.

Abstract : PARylation [poly(ADP-ribosyl)ation] is involved in the maintenance of genomic methylation patterns through its control of Dnmt1 [DNA (cytosine-5)-methyltransferase 1] activity. Our previous findings indicated that Ctcf (CCCTC-binding factor) may be an important player in key events whereby PARylation controls the unmethylated status of some CpG-rich regions. Ctcf is able to activate Parp1 [poly(ADP-ribose) polymerase 1], which ADP-ribosylates itself and, in turn, inhibits DNA methylation via non-covalent interaction between its ADP-ribose polymers and Dnmt1. By such a mechanism, Ctcf may preserve the epigenetic pattern at promoters of important housekeeping genes. The results of the present study showed Dnmt1 as a new protein partner of Ctcf. Moreover, we show that Ctcf forms a complex with Dnmt1 and PARylated Parp1 at specific Ctcf target sequences and that PARylation is responsible for the maintenance of the unmethylated status of some Ctcf-bound CpGs. We suggest a mechanism by which Parp1, tethered and activated at specific DNA target sites by Ctcf, preserves their methylation-free status.
Document type :
Journal articles
Complete list of metadata

Cited literature [39 references]  Display  Hide  Download
Contributor : Istituto Pasteur Fondazione Cenci Bolognetti Connect in order to contact the contributor
Submitted on : Wednesday, March 5, 2014 - 3:25:05 PM
Last modification on : Monday, November 28, 2022 - 5:44:05 PM
Long-term archiving on: : Sunday, April 9, 2017 - 8:59:22 PM


 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : jamais

Please log in to resquest access to the document




Michele Zampieri, Tiziana Guastafierro, Roberta Calabrese, Fabio Ciccarone, Maria G Bacalini, et al.. ADP-ribose polymers localized on Ctcf-Parp1-Dnmt1 complex prevent methylation of Ctcf target sites.. Biochemical Journal, 2012, 441 (2), pp.645-52. ⟨10.1042/BJ20111417⟩. ⟨pasteur-00955898⟩



Record views