Letter | Published:

Genomic safe harbors permit high β-globin transgene expression in thalassemia induced pluripotent stem cells

Nature Biotechnology volume 29, pages 7378 (2011) | Download Citation

Abstract

Realizing the therapeutic potential of human induced pluripotent stem (iPS) cells will require robust, precise and safe strategies for genetic modification, as cell therapies that rely on randomly integrated transgenes pose oncogenic risks. Here we describe a strategy to genetically modify human iPS cells at 'safe harbor' sites in the genome, which fulfill five criteria based on their position relative to contiguous coding genes, microRNAs and ultraconserved regions. We demonstrate that 10% of integrations of a lentivirally encoded β-globin transgene in β-thalassemia-patient iPS cell clones meet our safe harbor criteria and permit high-level β-globin expression upon erythroid differentiation without perturbation of neighboring gene expression. This approach, combining bioinformatics and functional analyses, should be broadly applicable to introducing therapeutic or suicide genes into patient-specific iPS cells for use in cell therapy.

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Acknowledgements

We thank X. Wang and N. Wu for assistance with HPLC analysis; L. Ferro, E. Reed, J. Miller, M. Leversha and M. Tomishima for technical assistance; F. Boulad, Memorial Sloan-Kettering Cancer Center New York for bone marrow specimens; and A. Athanassiadou for advice on β-thalassemia genotyping. pCMVΔR8.91N/N was kindly provided by E. Poeschla, Mayo Clinic, Rochester, Minnesota. This work was supported by the Starr Foundation (Tri-Institutional Stem Cell Initiative, Tri-SCI-018), the New York State Stem Cell Science, NYSTEM (N08T-060) and National Heart, Blood, and Lung Institute grant HL053750 (M.S.). F.D.B., S.L.R. and N.M. were supported by National Institutes of Health grants AI052845 and AI082020 (F.D.B.). G.L. was supported by a New York Stem Cell Foundation Druckenmiller fellowship.

Author information

Affiliations

  1. Center for Cell Engineering, Memorial Sloan-Kettering Cancer Center, New York, New York, USA.

    • Eirini P Papapetrou
    • , Isabelle Riviere
    • , Laxmi M S Tirunagari
    • , Kyuichi Kadota
    • , Lorenz Studer
    •  & Michel Sadelain
  2. Molecular Pharmacology and Chemistry Program, Memorial Sloan-Kettering Cancer Center, New York, New York, USA.

    • Eirini P Papapetrou
    • , Isabelle Riviere
    • , Laxmi M S Tirunagari
    •  & Michel Sadelain
  3. Developmental Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York, USA.

    • Gabsang Lee
    •  & Lorenz Studer
  4. Department of Microbiology, University of Pennsylvania, Philadelphia, Pennsylvania, USA.

    • Nirav Malani
    • , Shoshannah L Roth
    •  & Frederic D Bushman
  5. Computational Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York, USA.

    • Manu Setty
    •  & Christina Leslie
  6. Cell Therapy and Cell Engineering Facility, Memorial Sloan-Kettering Cancer Center, New York, New York, USA.

    • Isabelle Riviere
  7. Thoracic Service, Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York, USA.

    • Kyuichi Kadota
  8. Thalassemia Program, Pediatric Hematology/Oncology Division, Weill Cornell Medical College, New York, New York, USA.

    • Patricia Giardina
  9. Genomics Core Facility, Memorial Sloan-Kettering Cancer Center, New York, New York, USA.

    • Agnes Viale

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Contributions

E.P.P. conceived and designed the study, designed and performed experiments, analyzed data and wrote the manuscript; G.L. performed iPS cell differentiation experiments; N.M. performed bioinformatics analyses; M.S. and C.L. analyzed microarray data; L.M.S.T. provided technical assistance; K.K. performed histological analyses of teratomas; S.L.R. generated and analyzed integration site data; P.G. provided skin biopsy samples from β-thalassemia patients; A.V. generated microarray data; I.R., F.D.B. and L.S. analyzed data; M.S. conceived and designed the study, analyzed data and wrote the manuscript.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Michel Sadelain.

Supplementary information

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    Supplementary Text and Figures

    Supplementary Tables 1–9 and Supplementary Figs. 1–20

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    Supplementary Movie 1

    Beating putative cardiomyocytes derived from iPS cell line thal1.52.

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DOI

https://doi.org/10.1038/nbt.1717

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