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Transient p53 suppression increases reprogramming of human fibroblasts without affecting apoptosis and DNA damage

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  • Mikkel A Rasmussen
  • Bjørn Holst
  • Zeynep Tümer
  • Mads Grønvald Johnsen
  • Shuling Zhou
  • Tina C Stummann
  • Poul Hyttel
  • Christian Clausen
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The discovery of human-induced pluripotent stem cells (iPSCs) has sparked great interest in the potential treatment of patients with their own in vitro differentiated cells. Recently, knockout of the Tumor Protein 53 (p53) gene was reported to facilitate reprogramming but unfortunately also led to genomic instability. Here, we report that transient suppression of p53 during nonintegrative reprogramming of human fibroblasts leads to a significant increase in expression of pluripotency markers and overall number of iPSC colonies, due to downstream suppression of p21, without affecting apoptosis and DNA damage. Stable iPSC lines generated with or without p53 suppression showed comparable expression of pluripotency markers and methylation patterns, displayed normal karyotypes, contained between 0 and 5 genomic copy number variations and produced functional neurons in vitro. In conclusion, transient p53 suppression increases reprogramming efficiency without affecting genomic stability, rendering the method suitable for in vitro mechanistic studies with the possibility for future clinical translation.

Original languageEnglish
JournalStem Cell Reviews
Volume3
Issue number3
Pages (from-to)404-13
Number of pages10
ISSN1550-8943
DOIs
Publication statusPublished - 9 Sep 2014

ID: 44683026