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Precision genome engineering through adenine and cytosine base editing

Nature Plantsvolume 4pages148151 (2018) | Download Citation


Adenine base editors (ABEs), composed of an engineered deaminase and a catalytically impaired CRISPR–Cas9 variant, are powerful new tools for targeted base editing in cells and organisms. Together with cytosine base editors (CBEs), ABEs enable single-nucleotide conversions cleanly, efficiently and reversibly without double-stranded DNA cleavage, advancing genome editing in a new dimension.

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  1. 1.

    Kim, H. & Kim, J. S. A guide to genome engineering with programmable nucleases. Nat. Rev. Genet. 15, 321–334 (2014).

  2. 2.

    Komor, A. C., Kim, Y. B., Packer, M. S., Zuris, J. A. & Liu, D. R. Programmable editing of a target base in genomic DNA without double-stranded DNA cleavage. Nature 533, 420–424 (2016).

  3. 3.

    Nishida, K. et al. Targeted nucleotide editing using hybrid prokaryotic and vertebrate adaptive immune systems. Science 353, aaf8729 (2016).

  4. 4.

    Zong, Y. et al. Precise base editing in rice, wheat and maize with a Cas9-cytidine deaminase fusion. Nat. Biotechnol. 35, 438–440 (2017).

  5. 5.

    Shimatani, Z. et al. Targeted base editing in rice and tomato using a CRISPR-Cas9 cytidine deaminase fusion. Nat. Biotechnol. 35, 441–443 (2017).

  6. 6.

    Kim, K. et al. Highly efficient RNA-guided base editing in mouse embryos. Nat. Biotechnol. 35, 435–437 (2017).

  7. 7.

    Wang, L. et al. Enhanced base editing by co-expression of free uracil DNA glycosylase inhibitor. Cell. Res. 27, 1289–1292 (2017).

  8. 8.

    Komor, A. C. et al. Improved base excision repair inhibition and bacteriophage Mu Gam protein yields C:G-to-T:A base editors with higher efficiency and product purity. Sci. Adv. 3, eaao4774 (2017).

  9. 9.

    Gaudelli, N. M. et al. Programmable base editing of A*T to G*C in genomic DNA without DNA cleavage. Nature 551, 464–471 (2017).

  10. 10.

    Kuscu, C. et al. CRISPR-STOP: gene silencing through base-editing-induced nonsense mutations. Nat. Methods 14, 710–712 (2017).

  11. 11.

    Billon, P. et al. CRISPR-mediated base editing enables efficient disruption of eukaryotic genes through induction of STOP codons. Mol. Cell. 67, 1068–1079.e4 (2017).

  12. 12.

    Vierstra, J. et al. Functional footprinting of regulatory DNA. Nat. Methods 12, 927–930 (2015).

  13. 13.

    Hess, G. T. et al. Directed evolution using dCas9-targeted somatic hypermutation in mammalian cells. Nat. Methods 13, 1036–1042 (2016).

  14. 14.

    Ma, Y. et al. Targeted AID-mediated mutagenesis (TAM) enables efficient genomic diversification in mammalian cells. Nat. Methods 13, 1029–1035 (2016).

  15. 15.

    Lee, H. J., Kim, E. & Kim, J. S. Targeted chromosomal deletions in human cells using zinc finger nucleases. Genome Res. 20, 81–89 (2010).

  16. 16.

    Lee, H. J., Kweon, J., Kim, E., Kim, S. & Kim, J. S. Targeted chromosomal duplications and inversions in the human genome using zinc finger nucleases. Genome Res. 22, 539–548 (2012).

  17. 17.

    Park, C. Y. et al. Functional correction of large factor VIII gene chromosomal inversions in hemophilia a patient-derived iPSCs using CRISPR-Cas9. Cell. Stem Cell. 17, 213–220 (2015).

  18. 18.

    Kim, D. et al. Digenome-seq: genome-wide profiling of CRISPR-Cas9 off-target effects in human cells. Nat. Methods 12, 237–243 (2015).

  19. 19.

    Kim, D. et al. Genome-wide target specificities of CRISPR RNA-guided programmable deaminases. Nat. Biotechnol. 35, 475–480 (2017).

  20. 20.

    Rees, H. A. et al. Improving the DNA specificity and applicability of base editing through protein engineering and protein delivery. Nat. Commun. 8, 15790 (2017).

  21. 21.

    Kim, S., Kim, D., Cho, S. W., Kim, J. & Kim, J. S. Highly efficient RNA-guided genome editing in human cells via delivery of purified Cas9 ribonucleoproteins. Genome Res. 24, 1012–1019 (2014).

  22. 22.

    Woo, J. W. et al. DNA-free genome editing in plants with preassembled CRISPR-Cas9 ribonucleoproteins. Nat. Biotechnol. 33, 1162–1164 (2015).

  23. 23.

    Ma, H. et al. Correction of a pathogenic gene mutation in human embryos. Nature 548, 413–419 (2017).

  24. 24.

    Kleinstiver, B. P. et al. High-fidelity CRISPR-Cas9 nucleases with no detectable genome-wide off-target effects. Nature 529, 490–495 (2016).

  25. 25.

    Kim, Y. B. et al. Increasing the genome-targeting scope and precision of base editing with engineered Cas9-cytidine deaminase fusions. Nat. Biotechnol. 35, 371–376 (2017).

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This work was supported by a grant from Institute for Basic Science (IBS-R021-D1).

Author information


  1. Center for Genome Engineering, Institute for Basic Science, Seoul, Republic of Korea

    • Jin-Soo Kim
  2. Department of Chemistry, Seoul National University, Seoul, Republic of Korea

    • Jin-Soo Kim


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Competing interests

J.-S.K. is a co-founder of and holds stock in ToolGen, Inc. focused on genome editing.

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Correspondence to Jin-Soo Kim.

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