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miR-34 miRNAs provide a barrier for somatic cell reprogramming.

Nature cell biology | Oct 23, 2011

Somatic reprogramming induced by defined transcription factors is a low-efficiency process that is enhanced by p53 deficiency. So far, p21 is the only p53 target shown to contribute to p53 repression of iPSC (induced pluripotent stem cell) generation, indicating that additional p53 targets may regulate this process. Here, we demonstrate that miR-34 microRNAs (miRNAs), particularly miR-34a, exhibit p53-dependent induction during reprogramming. Mir34a deficiency in mice significantly increased reprogramming efficiency and kinetics, with miR-34a and p21 cooperatively regulating somatic reprogramming downstream of p53. Unlike p53 deficiency, which enhances reprogramming at the expense of iPSC pluripotency, genetic ablation of Mir34a promoted iPSC generation without compromising self-renewal or differentiation. Suppression of reprogramming by miR-34a was due, at least in part, to repression of pluripotency genes, including Nanog, Sox2 and Mycn (also known as N-Myc). This post-transcriptional gene repression by miR-34a also regulated iPSC differentiation kinetics. miR-34b and c similarly repressed reprogramming; and all three miR-34 miRNAs acted cooperatively in this process. Taken together, our findings identified miR-34 miRNAs as p53 targets that play an essential role in restraining somatic reprogramming.

Pubmed ID: 22020437 RIS Download

Mesh terms: Animals | Cell Differentiation | Cells, Cultured | Cellular Reprogramming | Coculture Techniques | Cyclin-Dependent Kinase Inhibitor p21 | Female | Gene Expression Regulation, Developmental | Genes, myc | Homeodomain Proteins | Induced Pluripotent Stem Cells | Kinetics | Male | Mice | Mice, 129 Strain | Mice, Inbred C57BL | Mice, Knockout | Mice, Nude | Mice, Transgenic | MicroRNAs | Nanog Homeobox Protein | Octamer Transcription Factor-3 | RNA Interference | SOXB1 Transcription Factors | Teratoma | Tumor Suppressor Protein p53

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Associated grants

  • Agency: NCI NIH HHS, Id: R01 CA139067
  • Agency: NCI NIH HHS, Id: R00 CA126186-05
  • Agency: NIGMS NIH HHS, Id: T32 GM007232
  • Agency: NCI NIH HHS, Id: R01 CA139067-01
  • Agency: NIGMS NIH HHS, Id: R01 GM062534
  • Agency: Howard Hughes Medical Institute, Id: R00 CA126186
  • Agency: NCI NIH HHS, Id: P01 CA013106
  • Agency: NCI NIH HHS, Id:

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