Cell Reports (Aug 2014)

Regulation of DNA Methylation Patterns by CK2-Mediated Phosphorylation of Dnmt3a

  • Rachel Deplus,
  • Loïc Blanchon,
  • Arumugam Rajavelu,
  • Abdelhalim Boukaba,
  • Matthieu Defrance,
  • Judith Luciani,
  • Françoise Rothé,
  • Sarah Dedeurwaerder,
  • Hélène Denis,
  • Arie B. Brinkman,
  • Femke Simmer,
  • Fabian Müller,
  • Benjamin Bertin,
  • Maria Berdasco,
  • Pascale Putmans,
  • Emilie Calonne,
  • David W. Litchfield,
  • Yvan de Launoit,
  • Tomasz P. Jurkowski,
  • Hendrik G. Stunnenberg,
  • Christoph Bock,
  • Christos Sotiriou,
  • Mario F. Fraga,
  • Manel Esteller,
  • Albert Jeltsch,
  • François Fuks

DOI
https://doi.org/10.1016/j.celrep.2014.06.048
Journal volume & issue
Vol. 8, no. 3
pp. 743 – 753

Abstract

Read online

DNA methylation is a central epigenetic modification that is established by de novo DNA methyltransferases. The mechanisms underlying the generation of genomic methylation patterns are still poorly understood. Using mass spectrometry and a phosphospecific Dnmt3a antibody, we demonstrate that CK2 phosphorylates endogenous Dnmt3a at two key residues located near its PWWP domain, thereby downregulating the ability of Dnmt3a to methylate DNA. Genome-wide DNA methylation analysis shows that CK2 primarily modulates CpG methylation of several repeats, most notably of Alu SINEs. This modulation can be directly attributed to CK2-mediated phosphorylation of Dnmt3a. We also find that CK2-mediated phosphorylation is required for localization of Dnmt3a to heterochromatin. By revealing phosphorylation as a mode of regulation of de novo DNA methyltransferase function and by uncovering a mechanism for the regulation of methylation at repetitive elements, our results shed light on the origin of DNA methylation patterns.