title: De novo DNA methylation by Dnmt3a and Dnmt3b is dispensable for nuclear reprogramming of somatic cells to a pluripotent state.
abstract: Induced pluripotent stem cells (iPSCs) are generated from somatic cells by the transduction of defined transcription factors, and this process involves dynamic changes in DNA methylation. While the reprogramming of somatic cells is accompanied by demethylation of pluripotency genes, the functional importance of de novo DNA methylation has not been clarified. Here, using loss-of-function studies, we generated iPSCs from fibroblasts that were deficient in de novo DNA methylation mediated by Dnmt3a and Dnmt3b. These iPSCs reactivated pluripotency genes, underwent self-renewal, and showed restricted developmental potential that was rescued upon reintroduction of Dnmt3a and Dnmt3b. We conclude that de novo DNA methylation by Dnmt3a and Dnmt3b is dispensable for nuclear reprogramming of somatic cells.
authors.affiliation: The Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142, USA.
authors.forename: Mathias
authors.initials: M
authors.lastname: Pawlak
authors.forename: Rudolf
authors.initials: R
authors.lastname: Jaenisch
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D065150:Cellular Reprogramming / Q000235:genetics / Q000502:physiology*; D004248:DNA (Cytosine-5-)-Methyltransferases / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D019175:DNA Methylation; D000090205:DNA Methyltransferase 3A; D005347:Fibroblasts / Q000166:cytology / Q000201:enzymology; D017353:Gene Deletion; D051379:Mice; D016513:Mice, SCID; D039904:Pluripotent Stem Cells / Q000166:cytology / Q000502:physiology*; D000097584:DNA Methyltransferase 3B
chemical_list: D004248:DNA (Cytosine-5-)-Methyltransferases; D000090205:DNA Methyltransferase 3A; D000097584:DNA Methyltransferase 3B; C000715535:Dnmt3a protein, mouse