Abstract
Conventional genome engineering with CRISPR–Cas9 creates double-strand breaks (DSBs) that lead to undesirable byproducts and reduce product purity. Here we report an approach for programmable integration of large DNA sequences in human cells that avoids the generation of DSBs by using Type I-F CRISPR-associated transposases (CASTs). We optimized DNA targeting by the QCascade complex through protein design and developed potent transcriptional activators by exploiting the multi-valent recruitment of the AAA+ ATPase TnsC to genomic sites targeted by QCascade. After initial detection of plasmid-based integration, we screened 15 additional CAST systems from a wide range of bacterial hosts, identified a homolog from Pseudoalteromonas that exhibits improved activity and further increased integration efficiencies. Finally, we discovered that bacterial ClpX enhances genomic integration by multiple orders of magnitude, likely by promoting active disassembly of the post-integration CAST complex, akin to its known role in Mu transposition. Our work highlights the ability to reconstitute complex, multi-component machineries in human cells and establishes a strong foundation to exploit CRISPR-associated transposases for eukaryotic genome engineering.
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Data availability
Sequencing data have been deposited in the National Center for Biotechnology Informationʼs Sequence Read Archive under Gene Expression Omnibus accession number GSE223174 (ref. 92). Source data are provided with this paper.
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Acknowledgements
We thank N. Jaber and S. R. Pesari for laboratory support, L. F. Landweber for qPCR instrument access, A. Santiago-Frangos for helpful ClpX discussions, the Columbia University Institute for Genomic Medicine for ddPCR instrument access, W. Frankel for thermocycler instrument access, the Columbia Stem Cell Initiative Flow Cytometry Core, M. Kissner and R. Gordon-Schneider for assistance in cell sorting and flow cytometry analysis, and the JP Sulzberger Columbia Genome Center for NGS support. We thank C. Lu and V. Sahu for cell sonicator instrument access and valuable discussions on ChIP-seq analysis. R.T.K. is supported by NIH grant 1F31HL167530-01 from the National Heart, Lung, and Blood Institute. A.C. is supported by a Career Award for Medical Scientists from the Burroughs Wellcome Fund and NIH grant HG011855-01 from the National Human Genome Research Institute. S.H.S. is supported by NIH grant DP2HG011650, a Pew Biomedical Scholarship, a Sloan Research Fellowship, an Irma T. Hirschl Career Scientist Award, and a generous startup package from the Columbia University Irving Medical Center Dean’s Office and the Vagelos Precision Medicine Fund.
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G.D.L. performed western blots, plasmid-based reporter assays and experiments screening CAST homologs and host proteins. R.T.K. performed genomic activation assays, ChIP experiments and ddPCR analyses. G.D.L. and R.T.K. performed integration assays and quantified integration efficiency by qPCR and amplicon sequencing. T.S.H.-H. performed initial human cell experiments and, together with M.I.H., tested tagged constructs for activity in E. coli. S.E.K. tested tagged constructs in E. coli and assisted with initial NGS library preparation and data analysis. P.L.H.V. designed and cloned constructs for initial I-E activation assays. S.T. performed ChIP-seq analyses. A.C. provided expert support and helped S.H.S. supervise the project. S.H.S., G.D.L., R.T.K. and A.C. discussed the data and wrote the manuscript, with input from all authors.
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Columbia University has filed a patent application related to this work. S.E.K., P.L.H.V., A.C. and S.H.S. are inventors on other patents and patent applications related to CRISPR–Cas systems and uses thereof. A.C. is a consultant for Vor Biopharma and an equity holder and scientific advisor for Cellgorithmics. S.H.S. is a co-founder of and scientific advisor to Dahlia Biosciences, a scientific advisor to Prime Medicine and CrisprBits and an equity holder in Dahlia Biosciences and CrisprBits. The remaining authors declare no competing interests.
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Lampe, G.D., King, R.T., Halpin-Healy, T.S. et al. Targeted DNA integration in human cells without double-strand breaks using CRISPR-associated transposases. Nat Biotechnol 42, 87–98 (2024). https://doi.org/10.1038/s41587-023-01748-1
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DOI: https://doi.org/10.1038/s41587-023-01748-1