| First Author | Li Z | Year | 2011 |
| Journal | EMBO J | Volume | 30 |
| Issue | 5 | Pages | 823-34 |
| PubMed ID | 21285944 | Mgi Jnum | J:170353 |
| Mgi Id | MGI:4946352 | Doi | 10.1038/emboj.2011.2 |
| Citation | Li Z, et al. (2011) Small RNA-mediated regulation of iPS cell generation. EMBO J 30(5):823-34 |
| abstractText | Somatic cells can be reprogrammed to an ES-like state to create induced pluripotent stem cells (iPSCs) by ectopic expression of four transcription factors, Oct4, Sox2, Klf4 and cMyc. Here, we show that cellular microRNAs (miRNAs) regulate iPSC generation. Knock-down of key microRNA pathway proteins resulted in significant decreases in reprogramming efficiency. Three miRNA clusters, miR-17 approximately 92, miR-106b approximately 25 and miR-106a approximately 363, were shown to be highly induced during early reprogramming stages. Several miRNAs, including miR-93 and miR-106b, which have very similar seed regions, greatly enhanced iPSC induction and modulated mesenchymal-to-epithelial transition step in the initiation stage of reprogramming, and inhibiting these miRNAs significantly decreased reprogramming efficiency. Moreover, miR-iPSC clones reached the fully reprogrammed state. Further analysis revealed that Tgfbr2 and p21 are directly targeted by these miRNAs and that siRNA knock-down of both genes indeed enhanced iPSC induction. Here, for the first time, we demonstrate that miR-93 and its family members directly target TGF-beta receptor II to enhance iPSC generation. Overall, we demonstrate that miRNAs function in the reprogramming process and that iPSC induction efficiency can be greatly enhanced by modulating miRNA levels in cells. |
