Abstract
A central challenge in experimental aging research is the lack of short-lived vertebrate models for genetic studies. Here we present a comprehensive protocol for efficient genome engineering in the African turquoise killifish (Nothobranchius furzeri), which is the shortest-lived vertebrate in captivity with a median life span of 4–6 months. By taking advantage of the clustered regularly interspaced short palindromic repeats/CRISPR-associated protein-9 nuclease (CRISPR/Cas9) system and the turquoise killifish genome, this platform enables the generation of knockout alleles via nonhomologous end joining (NHEJ) and knock-in alleles via homology-directed repair (HDR). We include guidelines for guide RNA (gRNA) target design, embryo injection and hatching, germ-line transmission and for minimizing off-target effects. We also provide strategies for Tol2-based transgenesis and large-scale husbandry conditions that are critical for success. Because of the fast life cycle of the turquoise killifish, stable lines can be generated as rapidly as 2–3 months, which is much faster than other fish models. This protocol provides powerful genetic tools for studying vertebrate aging and aging-related diseases.
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Acknowledgements
We thank all members of the Brunet lab, specifically B.A. Benayoun and P.P. Singh for all the work involving the genome project. We are grateful to our coauthors on Harel et al. (2015). We thank A.S. McKay for generating the files for 3D printing, C.-K. Hu for taking the photos for Figure 3b, A.S. McKay, C.-K. Hu, L. Booth, Y. Kim, W. Wei, P. Abitua and M. Concha for critical reading of the manuscript and important suggestions, and S. Thyme, M. Reichard and M.L. Powell for critical scientific discussions. This work was supported by US National Institutes of Health (NIH) DP1AG044848 and the Glenn Laboratories for the Biology of Aging (A.B.), by the Max Planck Society and the Max Planck Institute for Biology of Ageing (D.R.V.) and by the Damon Runyon, Rothschild and HFSP fellowships (I.H.).
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I.H. and A.B. conceived the project, and I.H. performed the experiments. I.H. and A.B. wrote the manuscript, with assistance from D.R.V.
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Supplementary Methods
Injection mold 3D-printing design. 3D-printing design for the injection mold with optimized dimensions. The design is provided in two commonly used file formats for 3D printing (.dwg and .stl), allowing for better flexibility in regard to the requirements of 3D-printing service providers. The .dwg format can be used by many programs, including DraftSight, AutoCAD, IntelliCAD and Caddie. The .stl format can be used by many programs, including AutoCAD, CloudCompare and FreeCAD. (ZIP 39 kb)
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Harel, I., Valenzano, D. & Brunet, A. Efficient genome engineering approaches for the short-lived African turquoise killifish. Nat Protoc 11, 2010–2028 (2016). https://doi.org/10.1038/nprot.2016.103
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DOI: https://doi.org/10.1038/nprot.2016.103
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