Reprogramming human T cell function and specificity with non-viral genome targeting
Open accessPublished version of a preprint
Abstract
Decades of work have aimed to genetically reprogram T cells for therapeutic purposes 1,2 using recombinant viral vectors, which do not target transgenes to specific genomic sites 3,4. The need for viral vectors has slowed down research and clinical use as their manufacturing and testing is lengthy and expensive. Genome editing brought the promise of specific and efficient insertion of large transgenes into target cells using homology-directed repair 5,6. Here we developed a CRISPR-Cas9 genome-targeting system that does not require viral vectors, allowing rapid and efficient insertion of large DNA sequences (greater than one kilobase) at specific sites in the genomes of primary human T cells, while preserving cell viability and function. This permits individual or multiplexed modification of endogenous genes. First, we applied this strategy to correct a pathogenic IL2RA mutation in cells from patients with monogenic autoimmune disease, and demonstrate improved signalling function. Second, we replaced the endogenous T cell receptor (TCR) locus with a new TCR that redirected T cells to a cancer antigen. The resulting TCR-engineered T cells specifically recognized tumour antigens and mounted productive anti-tumour cell responses in vitro and in vivo. Together, these studies provide preclinical evidence that non-viral genome targeting can enable rapid and flexible experimental manipulation and therapeutic engineering of primary human immune cells.
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In a Phase I clinical trial, an autologous bispecific CD19/CD22-targeted CAR T cell therapy was manufactured using the FasT CAR platform, reducing cell culture time to less than 24 hours.
“For a Phase I clinical trial, researchers manufactured an autologous, bispecific CD19/CD22-targeted CAR T cell therapy using the FasT CAR platform, reducing cell culture time to less than 24 hours (117,118).”
From Scalable Manufacturing of CAR T Cells for Cancer Immunotherapy (2021) · cites this paper as [118]
The Abstract (page unavailable) describes preclinical engineering of NY-ESO-1-targeted TCR cells, not a Phase I trial of bispecific CD19/CD22 CAR T cells. The Methods (Primary human T cell culture, page unavailable) specify two days of stimulation before electroporation, and the Abstract reports ten days of expansion—not cell culture lasting less than 24 hours. (LLM, conf=0.84)
Checked by a reasoning model — may be wrong.
Experimental — accuracy not yet measuredIn ten adolescent and adult patients with CD19+ relapsed/refractory B-ALL who received CD19 FasT CAR T cells, 10/10 (100%) achieved CR on day 15 after infusion, with only one patient experiencing CRS.
“On day 15 after cell infusion, 10/10 (100%) patients achieved CR, with only one patient experiencing CRS (118).”
From Scalable Manufacturing of CAR T Cells for Cancer Immunotherapy (2021) · cites this paper as [118]
The Abstract describes NY-ESO-1 TCR-engineered cells reducing tumour burden in treated animals, and Extended Data Figure 10 describes a mouse melanoma model; neither reports outcomes for patients receiving CD19 FasT CAR T cells. Searches for the day-15 10/10 complete-remission result and cytokine release syndrome found no passage addressing those claims. Page numbers were not available in our copy. (LLM, conf=0.76)
Experimental — accuracy not yet measuredMultiple barcoded templates introduced into the same cell could complicate interpretation of each one's effects.
“In addition, multiple barcoded templates introduced in the same cell could complicate interpretation of each one’s effects (Feldman et al., 2018; Roth et al., 2018).”
From Pooled Knockin Targeting for Genome Engineering of Cellular Immunotherapies (2020) · cites this paper as Roth et al., 2018
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Cites
Park, J., Adoro, S., Guinter, T. I., Erman, B., Alag, A., Catálfamo, M., Kimura, M. Y., Cui, Y., Lucas, P. J., Gress, R. E., et al. (2010) · Nature Immunology · doi:10.1038/ni.1840 · Cited by 5,835 · see citing works
Sakaguchi, S., Sakaguchi, N., Asano, M., Itoh, M., & Toda, M. (1995) · The Journal of Immunology · doi:10.4049/jimmunol.155.3.1151 · Cited by 5,608 · see citing works
Double nicking by RNA-guided CRISPR Cas9 for enhanced genome editing specificity
Ran, F. A., Hsu, P. D., Lin, C.-Y., Gootenberg, J. S., Konermann, S., Trevino, A. E., Scott, D. A., Inoue, A., Matoba, S., Zhang, Y., et al. (2013) · Cell · doi:10.1016/j.cell.2013.08.021 · Cited by 3,299 · see citing works
Lee, D. W., Kochenderfer, J. N., Stetler-Stevenson, M., Cui, Y. K., Delbrook, C., Feldman, S. A., Fry, T. J., Orentas, R., Sabatino, M., Shah, N. N., et al. (2015) · The Lancet · doi:10.1016/s0140-6736(14)61403-3 · Cited by 2,898 · see citing works
Adoptive cell transfer as personalized immunotherapy for human cancer
Rosenberg, S. A., & Restifo, N. P. (2015) · Science · doi:10.1126/science.aaa4967 · Cited by 2,492 · see citing works
Genetic and epigenetic fine mapping of causal autoimmune disease variants
Farh, K. K.-H., Marson, A., Zhu, J., Kleinewietfeld, M., Housley, W. J., Beik, S., Shoresh, N., Whitton, H., Ryan, R. J. H., Shishkin, A. A., et al. (2015) · Nature · doi:10.1038/nature13835 · Cited by 1,956 · see citing works
Self-citationKim, S., Kim, D., Cho, S. W., Kim, J., & Kim, J.-S. (2014) · Genome Research · doi:10.1101/gr.171322.113 · Cited by 1,856 · see citing works
Targeting a CAR to the TRAC locus with CRISPR/Cas9 enhances tumour rejection
Eyquem, J., Mansilla-Soto, J., Giavridis, T., van der Stegen, S. J. C., Hamieh, M., Cunanan, K. M., Odak, A., Gönen, M., & Sadelain, M. (2017) · Nature · doi:10.1038/nature21405 · Cited by 1,831 · see citing works
An efficient targeted nuclease strategy for high-resolution mapping of DNA binding sites
Skene, P. J., & Henikoff, S. (2017) · eLife · doi:10.7554/elife.21856 · Cited by 1,737 · see citing works
Cas9 as a versatile tool for engineering biology
Mali, P., Esvelt, K. M., & Church, G. M. (2013) · Nature Methods · doi:10.1038/nmeth.2649 · Cited by 1,197 · see citing works
In vivo genome editing via CRISPR/Cas9 mediated homology-independent targeted integration
Suzuki, K., Tsunekawa, Y., Hernandez-Benitez, R., Wu, J., Zhu, J., Kim, E. J., Hatanaka, F., Yamamoto, M., Araoka, T., Li, Z., et al. (2016) · Nature · doi:10.1038/nature20565 · Cited by 1,150 · see citing works
The Principles of Engineering Immune Cells to Treat Cancer
Lim, W. A., & June, C. H. (2017) · Cell · doi:10.1016/j.cell.2017.01.016 · Cited by 1,084 · see citing works
Therapeutic T cell engineering
Sadelain, M., Rivière, I., & Riddell, S. R. (2017) · Nature · doi:10.1038/nature22395 · Cited by 886 · see citing works
CRISPR/Cas9 β-globin gene targeting in human haematopoietic stem cells
Dever, D. P., Bak, R. O., Reinisch, A., Camarena, J., Washington, G., Nicolas, C. E., Pavel-Dinu, M., Saxena, N., Wilkens, A. B., Mantri, S., et al. (2016) · Nature · doi:10.1038/nature20134 · Cited by 864 · see citing works
Generation of knock-in primary human T cells using Cas9 ribonucleoproteins
Schumann, K., Lin, S., Boyer, E., Simeonov, D. R., Subramaniam, M., Gate, R. E., Haliburton, G. E., Ye, C. J., Bluestone, J. A., Doudna, J. A., et al. (2015) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1512503112 · Cited by 702 · see citing works
Self-citationQuadros, R. M., Miura, H., Harms, D. W., Akatsuka, H., Sato, T., Aida, T., Redder, R. J., Richardson, G. P., Inagaki, Y., Sakai, D., et al. (2017) · Genome biology · doi:10.1186/s13059-017-1220-4 · Cited by 502 · see citing works
Self-citationHuman immune disorder arising from mutation of the α chain of the interleukin-2 receptor
Sharfe, N., Dadi, H., Shahar, M., & Roifman, C. M. (1997) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.94.7.3168 · Cited by 405 · see citing works
Single and Dual Amino Acid Substitutions in TCR CDRs Can Enhance Antigen-Specific T Cell Functions
Robbins, P. F., Li, Y. F., El‐Gamil, M., Zhao, Y., Wargo, J. A., Zheng, Z., Xu, H., Morgan, R. A., Feldman, S. A., Johnson, L. A., et al. (2008) · The Journal of Immunology · doi:10.4049/jimmunol.180.9.6116 · Cited by 385 · see citing works
Hornung, V., & Latz, E. (2010) · Nature reviews. Immunology · doi:10.1038/nri2690 · Cited by 366 · see citing works
Discovery of stimulation-responsive immune enhancers with CRISPR activation
Simeonov, D. R., Gowen, B. G., Boontanrart, M., Roth, T. L., Gagnon, J. D., Mumbach, M. R., Satpathy, A. T., Lee, Y., Bray, N. L., Chan, A. Y., et al. (2017) · Nature · doi:10.1038/nature23875 · Cited by 297 · see citing works
Self-citationHigh-Efficiency Transfection of Primary Human and Mouse T Lymphocytes Using RNA Electroporation
Zhao, Y., Zheng, Z., Cohen, C. J., Gattinoni, L., Palmer, D. C., Restifo, N. P., Rosenberg, S. A., & Morgan, R. A. (2006) · Molecular Therapy · doi:10.1016/j.ymthe.2005.07.688 · Cited by 283 · see citing works
Refining strategies to translate genome editing to the clinic
Cornu, T. I., Mussolino, C., & Cathomen, T. (2017) · Nature Medicine · doi:10.1038/nm.4313 · Cited by 247 · see citing works
A scalable strategy for high-throughput GFP tagging of endogenous human proteins
Leonetti, M. D., Sekine, S., Kamiyama, D., Weissman, J. S., & Huang, B. (2016) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1606731113 · Cited by 225 · see citing works
Self-citationMarker-free coselection for CRISPR-driven genome editing in human cells
Agudelo, D., Duringer, A., Bozoyan, L., Huard, C., Carter, S., Loehr, J., Synodinou, D., Drouin, M., Salsman, J., Dellaire, G., et al. (2017) · Nature Methods · doi:10.1038/nmeth.4265 · Cited by 174 · see citing works
Synthetic Immunology: Hacking Immune Cells to Expand Their Therapeutic Capabilities
Roybal, K. T., & Lim, W. A. (2017) · Annual Review of Immunology · doi:10.1146/annurev-immunol-051116-052302 · Cited by 124 · see citing works
Bak, R. O., Dever, D. P., Reinisch, A., Cruz Hernandez, D., Majeti, R., & Porteus, M. H. (2017) · eLife · doi:10.7554/elife.27873 · Cited by 122 · see citing works
Recombination events during integration of transfected DNA into normal human cells
Murnane, J. P., Yezzi, M. J., & Young, B. R. (1990) · Nucleic Acids Research · doi:10.1093/nar/18.9.2733 · Cited by 77 · see citing works
Homology-Directed Recombination for Enhanced Engineering of Chimeric Antigen Receptor T Cells
Hale, M. R., Lee, B., Honaker, Y., Leung, W., Grier, A. E., Jacobs, H. M., Sommer, K., Sahni, J., Jackson, S. W., Scharenberg, A. M., et al. (2017) · Molecular Therapy — Methods & Clinical Development · doi:10.1016/j.omtm.2016.12.008 · Cited by 72 · see citing works
Design and specificity of long ssDNA donors for CRISPR-based knock-inPreprint
Li, H., Beckman, K. A., Pessino, V., Huang, B., Weissman, J. S., & Leonetti, M. D. (2017) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.1101/178905 · Cited by 59 · see citing works
Self-citationCain-Hom, C., Splinter, E., van Min, M., et al. (2016) · Nucleic Acids Research · doi:10.1093/nar/gkw1329 · Cited by 52 · see citing works
Lentiviral Vector Gene Transfer into Human T Cells
Verhoeyen, E., Costa, C., & Cosset, F. (2009) · Methods in molecular biology · doi:10.1007/978-1-59745-409-4_8 · Cited by 34 · see citing works
Therapeutic Gene Editing Safety and Specificity
Lux, C. T., & Scharenberg, A. M. (2017) · Hematology/Oncology Clinics of North America · doi:10.1016/j.hoc.2017.05.002 · Cited by 33 · see citing works
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Larson, R. C., & Maus, M. V. (2021) · Nature Reviews Cancer · doi:10.1038/s41568-020-00323-z · Cited by 852 · see citing works
Genome-wide CRISPR Screens in Primary Human T Cells Reveal Key Regulators of Immune Function
Shifrut, E., Carnevale, J., Tobin, V., Roth, T. L., Woo, J. M., Bui, C. T., Li, P. J., Diolaiti, M. E., Ashworth, A., & Marson, A. (2018) · Cell · doi:10.1016/j.cell.2018.10.024 · Cited by 573 · see citing works
Self-citationScalable Manufacturing of CAR T Cells for Cancer Immunotherapy
Abou-el-Enein, M., Elsallab, M., Feldman, S. A., Fesnak, A. D., Heslop, H. E., Marks, P., Till, B. G., Bauer, G., & Savoldo, B. (2021) · Blood Cancer Discovery · doi:10.1158/2643-3230.bcd-21-0084 · Cited by 321 · see citing works
A new era in functional genomics screens
Przybyla, L., & Gilbert, L. A. (2022) · Nature Reviews Genetics · doi:10.1038/s41576-021-00409-w · Cited by 281 · see citing works
Pance, K., Gramespacher, J. A., Byrnes, J. R., Salangsang, F., Serrano, J.-A. C., Cotton, A. D., Steri, V., & Wells, J. A. (2023) · Nature Biotechnology · doi:10.1038/s41587-022-01456-2 · Cited by 265 · see citing works
CAR-NK for tumor immunotherapy: Clinical transformation and future prospects
Wang, W., Jiang, J., & Wu, C. (2020) · Cancer Letters · doi:10.1016/j.canlet.2019.11.033 · Cited by 221 · see citing works
Pooled Knockin Targeting for Genome Engineering of Cellular Immunotherapies
Roth, T. L., Li, P. J., Blaeschke, F., Nies, J. F., Apathy, R., Mowery, C., Yu, R., Nguyen, M. L. T., Lee, Y., Truong, A., et al. (2020) · Cell · doi:10.1016/j.cell.2020.03.039 · Cited by 186 · see citing works
Self-citationSchober, K., Müller, T. R., Gökmen, F., Grassmann, S., Effenberger, M., Poltorak, M., Stemberger, C., Schumann, K., Roth, T. L., Marson, A., et al. (2019) · Nature Biomedical Engineering · doi:10.1038/s41551-019-0409-0 · Cited by 178 · see citing works
Self-citationCas9-induced large deletions and small indels are controlled in a convergent fashion
Kosicki, M., Allen, F., Steward, F., Tomberg, K., Pan, Y., & Bradley, A. (2022) · Nature Communications · doi:10.1038/s41467-022-30480-8 · Cited by 115 · see citing works
TCRdb: a comprehensive database for T-cell receptor sequences with powerful search function
Chen, S.-Y., Yue, T., Lei, Q., & Guo, A.-Y. (2021) · Nucleic Acids Research · doi:10.1093/nar/gkaa796 · Cited by 106 · see citing works
The Cellular Immunotherapy Revolution: Arming the Immune System for Precision Therapy
Paucek, R. D., Baltimore, D., & Li, G. (2019) · Trends in Immunology · doi:10.1016/j.it.2019.02.002 · Cited by 104 · see citing works
High-efficiency nonviral CRISPR/Cas9-mediated gene editing of human T cells using plasmid donor DNA
Oh, S. A., Senger, K., Madireddi, S., Akhmetzyanova, I., Ishizuka, I. E., Tarighat, S., Lo, J. H., Shaw, D., Haley, B., & Rutz, S. (2022) · Journal of Experimental Medicine · doi:10.1084/jem.20211530 · Cited by 88 · see citing works
Tipanee, J., Samara-Kuko, E., Gevaert, T., Chuah, M. K., & VandenDriessche, T. (2022) · Molecular Therapy · doi:10.1016/j.ymthe.2022.06.006 · Cited by 76 · see citing works
Ekert, J. E., Deakyne, J., Pribul-Allen, P., Terry, R., Schofield, C., Jeong, C. G., Storey, J., Mohamet, L., Francis, J., Naidoo, A., et al. (2020) · SLAS DISCOVERY · doi:10.1177/2472555220923332 · Cited by 68 · see citing works
Glaser, V., Flugel, C., Kath, J., Du, W., Drosdek, V., Franke, C., Stein, M., Pruß, A., Schmueck-Henneresse, M., Volk, H.-D., et al. (2023) · Genome biology · doi:10.1186/s13059-023-02928-7 · Cited by 65 · see citing works
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- Authors
- Roth, T. L., Puig-Saus, C., Yu, R., Shifrut, E., Carnevale, J., Li, P. J., Hiatt, J., Saco, J., Krystofinski, P., Li, H., Tobin, V., Nguyen, D. N., Lee, M. R., Putnam, A. L., Ferris, A. L., Chen, J. W., Schickel, J.-N., Pellerin, L., Carmody, D., Alkorta-Aranburu, G., del Gaudio, D., Matsumoto, H., Morell, M., Mao, Y., Cho, M., Quadros, R. M., Gurumurthy, C. B., Smith, B., Haugwitz, M., Hughes, S. H., Weissman, J. S., Schumann, K., Esensten, J. H., May, A. P., Ashworth, A., Kupfer, G. M., Greeley, S. A. W., Bacchetta, R., Meffre, E., Roncarolo, M. G., Romberg, N., Herold, K. C., Ribas, A., Leonetti, M. D., & Marson, A.
- Affiliations
- University of California, San Francisco (US)
- University of California, Los Angeles (US)
- Howard Hughes Medical Institute (US)
- National Cancer Institute (US)
- Yale University (US)
- Stanford Medicine (US)
- University of Chicago (US)
- Takara (United States) (US)
- Chan Zuckerberg Biohub San Francisco (US)
- University of Nebraska Medical Center (US)
- Children's Hospital of Philadelphia (US)
- Corresponding author
- Marson, Alexander
- ORCID
- Roth, Theodore L.
- Puig-Saus, Cristina
- Shifrut, Eric
- Carnevale, Julia
- Li, P. Jonathan
- Hiatt, Joseph
- Saco, Justin
- Krystofinski, Paige
- Li, Han
- Tobin, Victoria
- Nguyen, David N.
- Putnam, Amy L.
- Chen, Jeff W.
- Schickel, Jean-Nicolas
- Pellerin, Laurence
- Carmody, David
- Mao, Ying
- Quadros, Rolen M.
- Gurumurthy, Channabasavaiah B.
- Hughes, Stephen H.
- Weissman, Jonathan S.
- Schumann, Kathrin
- Esensten, Jonathan H.
- May, Andrew P.
- Ashworth, Alan
- Kupfer, Gary M.
- Greeley, Siri Atma W.
- Bacchetta, Rosa
- Meffre, Eric
- Roncarolo, Maria Grazia
- Romberg, Neil
- Herold, Kevan C.
- Ribas, Antoni
- Leonetti, Manuel D.
- Marson, Alexander
- Venue
- Nature
- Published
- 2018-07
- Volume
- 559
- Issue
- 7714
- Pages
- 405-409
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- PMC
- PMC6239417
- OpenAlex
- W2818540548
- Cited by
- 839
- References
- 32
- Citations by year
- 2026: 89 · 2025: 82 · 2024: 93 · 2023: 110 · 2022: 116 · 2021: 128 · 2020: 100 · 2019: 98 · 2018: 21 · 2017: 1
- FWCI
- 30.70
- Type
- journal article
- Language
- en
- Open access
- green
- doi.org
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature (publishedVersion)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Funders
- Burroughs Wellcome Fund
- W. M. Keck Foundation
- Jeffrey Modell Foundation
- Sanofi
- Gilead Sciences
- Parker Institute for Cancer Immunotherapy (P30 DK063720, R35 CA197633)
- Multiple Sclerosis Society
- National Institutes of Health (1s10od021822-01, DK020595, DK063720, NIH P30 DK063720)
- University of California, San Francisco (T32 DK007418, 1S10OD021822-01, T32GM007618, P30DK063720, DK063720)
- Juno Therapeutics
- National Cancer Institute (CA197633, T32CA108462, P30CA082103, R35CA197633)
- National Institute of General Medical Sciences (P50GM082250, T32GM007618)
- National Institute of Allergy and Infectious Diseases (T32AI007334, K23AI115001, L40 AI140341, T32AI007641)
- National Institute of Diabetes and Digestive and Kidney Diseases (DP3DK111914, K23DK094866, P30DK063720, T32DK007418, P30DK020595)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
- Health Sciences › Medicine › Oncology › CAR-T cell therapy research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
- Keywords
- CRISPR/Cas9 genome editing, T cell engineering, cancer immunotherapy, homology-directed repair, T cell reprogramming
- MeSH terms
- Gene Editing, Animals, Cells, Cultured, Humans, Male, Neoplasm Transplantation, Receptors, Antigen, T-Cell, T-Lymphocytes, Protein Engineering, Autoimmunity, Genome, Human, Mice, Interleukin-2 Receptor alpha Subunit, CRISPR-Cas Systems, Cellular Reprogramming
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