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Rescue of DNA-PK Signaling and T-Cell Differentiation by Targeted Genome Editing in a Deficient iPSC Disease Model
Due to the limited availability and lifespan of some primary cells, in vitro disease modeling with induced pluripotent stem cells (iPSCs) offers a valuable complementation to in vivo studies. The goal of our study was to establish an in vitro disease model for severe combined immunodeficiency (SCID), a group of inherited disorders of the immune system characterized by the lack of T-lymphocytes. To this end, we generated iPSCs from fibroblasts of a radiosensitive SCID (RS-SCID) mouse model and established a protocol to recapitulate T-lymphopoiesis from iPSCs in vitro. We used designer nucleases to edit the underlying mutation in prkdc, the gene encoding DNA-PKcs, and demonstrated that genetic correction of the disease locus rescued DNA-PK dependent signaling, restored normal radiosensitivity, and enabled T-cell maturation and polyclonal T-cell receptor recombination. We hence provide proof that the combination of two promising technology platforms, iPSCs and designer nucleases, with a protocol to generate T-cells in vitro, represents a powerful paradigm for SCID disease modeling and the evaluation of therapeutic gene editing strategies. Furthermore, our system provides a basis for further development of iPSC-derived cell products with the potential for various clinical applications, including infusions of in vitro derived autologous T-cells to stabilize patients after hematopoietic stem cell transplantation.
Vyšlo v časopise: Rescue of DNA-PK Signaling and T-Cell Differentiation by Targeted Genome Editing in a Deficient iPSC Disease Model. PLoS Genet 11(5): e32767. doi:10.1371/journal.pgen.1005239
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1005239Souhrn
Due to the limited availability and lifespan of some primary cells, in vitro disease modeling with induced pluripotent stem cells (iPSCs) offers a valuable complementation to in vivo studies. The goal of our study was to establish an in vitro disease model for severe combined immunodeficiency (SCID), a group of inherited disorders of the immune system characterized by the lack of T-lymphocytes. To this end, we generated iPSCs from fibroblasts of a radiosensitive SCID (RS-SCID) mouse model and established a protocol to recapitulate T-lymphopoiesis from iPSCs in vitro. We used designer nucleases to edit the underlying mutation in prkdc, the gene encoding DNA-PKcs, and demonstrated that genetic correction of the disease locus rescued DNA-PK dependent signaling, restored normal radiosensitivity, and enabled T-cell maturation and polyclonal T-cell receptor recombination. We hence provide proof that the combination of two promising technology platforms, iPSCs and designer nucleases, with a protocol to generate T-cells in vitro, represents a powerful paradigm for SCID disease modeling and the evaluation of therapeutic gene editing strategies. Furthermore, our system provides a basis for further development of iPSC-derived cell products with the potential for various clinical applications, including infusions of in vitro derived autologous T-cells to stabilize patients after hematopoietic stem cell transplantation.
Zdroje
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