title: In vitro reprogramming of fibroblasts into a pluripotent ES-cell-like state.
abstract: Nuclear transplantation can reprogramme a somatic genome back into an embryonic epigenetic state, and the reprogrammed nucleus can create a cloned animal or produce pluripotent embryonic stem cells. One potential use of the nuclear cloning approach is the derivation of 'customized' embryonic stem (ES) cells for patient-specific cell treatment, but technical and ethical considerations impede the therapeutic application of this technology. Reprogramming of fibroblasts to a pluripotent state can be induced in vitro through ectopic expression of the four transcription factors Oct4 (also called Oct3/4 or Pou5f1), Sox2, c-Myc and Klf4. Here we show that DNA methylation, gene expression and chromatin state of such induced reprogrammed stem cells are similar to those of ES cells. Notably, the cells-derived from mouse fibroblasts-can form viable chimaeras, can contribute to the germ line and can generate live late-term embryos when injected into tetraploid blastocysts. Our results show that the biological potency and epigenetic state of in-vitro-reprogrammed induced pluripotent stem cells are indistinguishable from those of ES cells.
authors.affiliation: Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02142, USA.
authors.forename: Marius
authors.initials: M
authors.lastname: Wernig
authors.forename: Alexander
authors.initials: A
authors.lastname: Meissner
authors.forename: Ruth
authors.initials: R
authors.lastname: Foreman
authors.forename: Tobias
authors.initials: T
authors.lastname: Brambrink
authors.forename: Manching
authors.initials: M
authors.lastname: Ku
authors.forename: Konrad
authors.initials: K
authors.lastname: Hochedlinger
authors.forename: Bradley E
authors.initials: BE
authors.lastname: Bernstein
authors.forename: Rudolf
authors.initials: R
authors.lastname: Jaenisch
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D019070:Cell Lineage; D002678:Chimera / Q000196:embryology / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D002843:Chromatin / Q000235:genetics / Q000378:metabolism; D019175:DNA Methylation; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D005260:Female; D005347:Fibroblasts / Q000166:cytology* / Q000378:metabolism; D020868:Gene Silencing; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism; D000090062:Kruppel-Like Factor 4; D008297:Male; D051379:Mice; D000071317:Nanog Homeobox Protein; D050814:Octamer Transcription Factor-3 / Q000235:genetics / Q000378:metabolism; D039904:Pluripotent Stem Cells / Q000166:cytology* / Q000378:metabolism; D013724:Teratoma / Q000378:metabolism / Q000473:pathology
chemical_list: D002843:Chromatin; D004268:DNA-Binding Proteins; D018398:Homeodomain Proteins; C000715468:Klf4 protein, mouse; D000090062:Kruppel-Like Factor 4; D000071317:Nanog Homeobox Protein; C475540:Nanog protein, mouse; D050814:Octamer Transcription Factor-3; C494174:Pou5f1 protein, mouse