Impaired cell reprogramming in non-homologous end joining deficient cells

Item Type:	Article
Title:	Impaired cell reprogramming in non-homologous end joining deficient cells
Creators Name:	Molina-Estevez, F.J. and Lozano, M.L. and Navarro, S. and Torres, Y. and Grabundzija, I. and Ivics, Z. and Samper, E. and Bueren, J.A. and Guenechea, G.
Abstract:	Although there is an increasing interest in defining the role of DNA damage response mechanisms in cell reprogramming, the relevance of proteins participating in Non-Homologous End Joining (NHEJ), a major mechanism of DNA double strand breaks repair, in this process remains to be investigated. Herein, we present data related to the reprogramming of primary mouse embryonic fibroblasts (MEF) from severe combined immunodeficient (Scid) mice defective in DNA-PKcs: a key protein for NHEJ. Reduced numbers of induced pluripotent stem cell (iPSC) colonies were generated from Scid cells using reprogramming lentiviral vectors (LV), being the reprogramming efficiency 4 to 7 fold lower than the observed in wt cells. Moreover, these Scid iPSC-like clones were prematurely lost or differentiated spontaneously. While the Scid mutation did not reduce the proliferation rate nor the transduction efficacy of fibroblasts transduced with reprogramming LV, both the expression of SA-{beta}-Gal and of P16/INK(4a) senescence markers were highly increased in Scid versus wt pMEFs during the reprogramming process, accounting for the reduced reprogramming efficacy of Scid MEFs. The use of improved Sleeping Beauty (SB) transposon/transposase systems allowed us, however, to isolate DNA-PKcs-deficient iPSCs which preserved their parental genotype and hypersensitivity to ionizing radiation. This new disease-specific iPSC model would be useful to understand the physiological consequences of the DNA-PKcs mutation during development and would help to improve current cell and gene therapy strategies for the disease.
Keywords:	Induced Pluripotent Stem Cells, Immunodeficient Mouse, Reprogramming, Non-Homologous End Joining, SCID, DNA-PKcs, NHEJ, Animals, Mice
Source:	Stem Cells
ISSN:	1066-5099
Publisher:	Wiley-Blackwell
Volume:	31
Number:	8
Page Range:	1726-1730
Date:	August 2013
Official Publication:	https://doi.org/10.1002/stem.1406
PubMed:	View item in PubMed

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