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A human iPSC model of Ligase IV deficiency reveals an important role for NHEJ-mediated-DSB repair in the survival and genomic stability of induced pluripotent stem cells and emerging haematopoietic progenitors
- K Tilgner1,2,
- I Neganova1,2,
- I Moreno-Gimeno3,
- J Y AL-Aama4,
- D Burks3,
- S Yung1,2,
- C Singhapol5,
- G Saretzki5,
- J Evans1,
- V Gorbunova6,
- A Gennery7,
- S Przyborski8,
- M Stojkovic9,
- L Armstrong1,2,
- P Jeggo10 &
- …
- M Lako1,2
Cell Death & Differentiationvolume 20, pages1089–1100 (2013)Cite this article
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45Citations
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Abstract
DNA double strand breaks (DSBs) are the most common form of DNA damage and are repaired by non-homologous-end-joining (NHEJ) or homologous recombination (HR). Several protein components function in NHEJ, and of these, DNA Ligase IV is essential for performing the final ‘end-joining’ step. Mutations inDNA Ligase IV result in LIG4 syndrome, which is characterised by growth defects, microcephaly, reduced number of blood cells, increased predisposition to leukaemia and variable degrees of immunodeficiency. In this manuscript, we report the creation of a human induced pluripotent stem cell (iPSC) model of LIG4 deficiency, which accurately replicates the DSB repair phenotype of LIG4 patients. Our findings demonstrate that impairment of NHEJ-mediated-DSB repair in human iPSC results in accumulation of DSBs and enhanced apoptosis, thus providing new insights into likely mechanisms used by pluripotent stem cells to maintain their genomic integrity. Defects in NHEJ-mediated-DSB repair also led to a significant decrease in reprogramming efficiency of human cells and accumulation of chromosomal abnormalities, suggesting a key role for NHEJ in somatic cell reprogramming and providing insights for future cell based therapies for applications of LIG4-iPSCs. Although haematopoietic specification of LIG4-iPSC is not affectedper se, the emerging haematopoietic progenitors show a high accumulation of DSBs and enhanced apoptosis, resulting in reduced numbers of mature haematopoietic cells. Together our findings provide new insights into the role of NHEJ-mediated-DSB repair in the survival and differentiation of progenitor cells, which likely underlies the developmental abnormalities observed in many DNA damage disorders. In addition, our findings are important for understanding how genomic instability arises in pluripotent stem cells and for defining appropriate culture conditions that restrict DNA damage and result inex vivo expansion of stem cells with intact genomes.
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Abbreviations
- NHEJ:
Non homologous end joining
- DSB:
double strand break
- iPSC:
induced pluripotent stem cells
- HR:
homologous recombination
- IR:
ionising radiation
- MMEJ:
microhomology-mediated-end joining
- ESC:
embryonic stem cells
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Acknowledgements
The authors would like to thank Mr Ian Dimmick and Dr Owen Hughes for their help with the flow cytometric analysis, Dr. Josef Jaros for help with the work on cytoskeleton and ROCK signalling, Complement Genomics plc. for carrying out the DNA fingerprinting analysis, Addgene for provision of the Cre construct and Coriell Cell Repositories for providing some of the LIG4 patient fibroblasts. This study was supported by Leukamia and Lymphoma Research Grant 09005 and funds for research in the field of Regenerative Medicine through the collaboration agreement from the Conselleria de Sanidad (Generalitat Valenciana) and the Instituto de Salud Carlos III (Ministry of Science and Innovation), Spain.
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Authors and Affiliations
Institute of Genetic Medicine, International Centre for Life, Newcastle University, Newcastle, UK
K Tilgner, I Neganova, S Yung, J Evans, L Armstrong & M Lako
NESCI, Newcastle University, Newcastle, UK
K Tilgner, I Neganova, S Yung, L Armstrong & M Lako
Centro de Investigacion Principe Felipe, Valencia, Spain
I Moreno-Gimeno & D Burks
Princess Al Jawhara Al-Brahim Center of Excellence in Research of Hereditary Disorders, King Abdulaziz University, Jeddah, Saudi Arabia
J Y AL-Aama
Institute for Ageing and Health, Newcastle University, Newcastle, UK
C Singhapol & G Saretzki
Department of Biology, University of Rochester, Rochester, NY, USA
V Gorbunova
Institute of Cellular Medicine, Newcastle University, Newcastle, UK
A Gennery
School of Biological and Biomedical Sciences, Durham University, Durham, UK
S Przyborski
Human Genetics Department, Medical Faculty, University of Kragujevac, Kragujevac, Serbia
M Stojkovic
Genome Damage and Stability Centre, University of Sussex, Brighton, UK
P Jeggo
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Correspondence toM Lako.
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Edited by B Zhivotovsky
Author contributions:
Katarzyna Tilgner: performed the majority of experiments, data collection and analysis, contribution to manuscript writing, final approval of manuscript. Irina Neganova, Inmaculada Moreno-Gimeno, Deborah Burks, Sun Yung, Jerome Evans, Gabriele Saretzki, Chatchawan Singhapol: performed some of the experiments, final approval of manuscript.Jumana Yousuf AL-Aama: provided important reagents for this work, performed some of the experiments, final approval of manuscript. Vera Gorbunova: provided important reagents for this work, final approval of manuscript. Andrew Gennery: conception and design of the study, provided important reagents for this work, final approval of manuscript. Stefan Przyborski: performed some of the experiments, collection and analysis of the data, contributed to manuscript writing and final approval of manuscript. Miodrag Stojkovic, Lyle Armstrong: conception and design, manuscript writing, fund raising and final approval of manuscript. Penny Jeggo: provided reagents for this work, design, data analysis, manuscript writing, fund raising and final approval of manuscript. Majlinda Lako: conception and design, performed experiments, data analysis, manuscript writing, fund raising and final approval of manuscript.
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Tilgner, K., Neganova, I., Moreno-Gimeno, I.et al. A human iPSC model of Ligase IV deficiency reveals an important role for NHEJ-mediated-DSB repair in the survival and genomic stability of induced pluripotent stem cells and emerging haematopoietic progenitors.Cell Death Differ20, 1089–1100 (2013). https://doi.org/10.1038/cdd.2013.44
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