title: MicroRNA-based discovery of barriers to dedifferentiation of fibroblasts to pluripotent stem cells.
abstract: Individual microRNAs (miRNAs) can target hundreds of mRNAs forming networks of presumably cooperating genes. To test this presumption, we functionally screened miRNAs and their targets in the context of dedifferentiation of mouse fibroblasts to induced pluripotent stem cells (iPSCs). Along with the miR-302-miR-294 family, the miR-181 family arose as a previously unidentified enhancer of the initiation phase of reprogramming. Endogenous miR-181 miRNAs were transiently elevated with the introduction of Pou5f1 (also known as Oct4), Sox2 and Klf4 (referred to as OSK), and miR-181 inhibition diminished iPSC colony formation. We tested the functional contribution of 114 individual targets of the two families, revealing 25 genes that normally suppress initiation. Coinhibition of targets cooperatively promoted both the frequency and kinetics of OSK-induced reprogramming. These data establish two of the largest functionally defined networks of miRNA-mRNA interactions and reveal previously unidentified relationships among genes that act together to suppress early stages of reprogramming.
authors.affiliation: 1] The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Center for Reproductive Sciences, Program in Biomedical Sciences, University of California San Francisco, San Francisco, California, USA. [2] Department of Urology, University of California San Francisco, San Francisco, California, USA.
authors.forename: Robert L
authors.initials: RL
authors.lastname: Judson
authors.forename: Tobias S
authors.initials: TS
authors.lastname: Greve
authors.forename: Ronald J
authors.initials: RJ
authors.lastname: Parchem
authors.forename: Robert
authors.initials: R
authors.lastname: Blelloch
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000502:physiology*; D005347:Fibroblasts / Q000166:cytology*; D000090062:Kruppel-Like Factor 4; D051379:Mice; D035683:MicroRNAs / Q000502:physiology*; D039904:Pluripotent Stem Cells / Q000166:cytology*
chemical_list: C000715468:Klf4 protein, mouse; D000090062:Kruppel-Like Factor 4; D035683:MicroRNAs
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