title: DNA methylation reprogramming and DNA repair in the mouse zygote.
abstract: Here, we summarize current knowledge about epigenetic reprogramming during mammalian preimplantation development, as well as the potential mechanisms driving these processes. We will particularly focus on changes taking place in the zygote, where the paternally derived DNA and chromatin undergo the most striking alterations, such as replacement of protamines by histones, histone modifications and active DNA demethylation. The putative mechanisms of active paternal DNA demethylation have been studied for over a decade, accumulating a lot of circumstantial evidence for enzymatic activities provided by the oocyte, protection of the maternal genome against such activities and possible involvement of DNA repair. We will discuss the various facets of dynamic epigenetic changes related to DNA methylation with an emphasis on the putative involvement of DNA repair in DNA demethylation.
authors.affiliation: University of Saarland, Institute for Genetics/Epigenetics, Saarbrücken, Germany. k.lepikhov@mx.uni-saarland.de
authors.forename: Konstantin
authors.initials: K
authors.lastname: Lepikhov
authors.forename: Mark
authors.initials: M
authors.lastname: Wossidlo
authors.forename: Julia
authors.initials: J
authors.lastname: Arand
authors.forename: Joern
authors.initials: J
authors.lastname: Walter
mesh_terms: D000818:Animals; D002843:Chromatin / Q000235:genetics / Q000378:metabolism; D042002:Chromatin Assembly and Disassembly; D019175:DNA Methylation; D004260:DNA Repair; D047108:Embryonic Development / Q000235:genetics*; D044127:Epigenesis, Genetic; D018507:Gene Expression Regulation, Developmental; D006657:Histones / Q000235:genetics / Q000378:metabolism; D051379:Mice; D009865:Oocytes / Q000378:metabolism; D015053:Zygote / Q000378:metabolism*
chemical_list: D002843:Chromatin; D006657:Histones