Abstract
We present a new concept in DNA engineering based on a pipeline of serial recombineering steps in liquid culture. This approach is fast, straightforward and facilitates simultaneous processing of multiple samples in parallel. We validated the approach by generating green fluorescent protein (GFP)-tagged transgenes from Caenorhabditis briggsae genomic clones in a multistep pipeline that takes only 4 d. The transgenes were engineered with minimal disturbance to the natural genomic context so that the correct level and pattern of expression will be secured after transgenesis. An example transgene for the C. briggsae ortholog of lin-59 was used for ballistic transformation in Caenorhabditis elegans. We show that the cross-species transgene is correctly expressed and rescues RNA interference (RNAi)-mediated knockdown of the endogenous C. elegans gene. The strategy that we describe adapts the power of recombineering in Escherichia coli for fluent DNA engineering to a format that can be directly scaled up for genomic projects.
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Acknowledgements
We thank M. Valvano for the pSCRhaB2 plasmid; the Caenorhabditis Genetics Center for worm strains; and E. Entchev, L. Pelletier, J. Fu and members of the Genomics Department of TU Dresden for discussions. This work was supported by the European Union and Freistaat Sachsen, by Europäischer Fonds für regionale Entwicklung (EFRE) funding (project code 181) through the Sächsisches Staatsministerium für Wissenschaft und Kunst (SMWK) and Technische Universität Dresden (TUD), and by the Bundesminiterium fuer Bildung und Forschung (BMBF) Proteomics Program.
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M.S. performed the experiments in Figures 1,3–5; M.S., S.S. and A.P. generated the reagents used in Figure 2; A.R. generated the BAC clone map; S.E. performed the bombardment experiments; Y.Z. provided reagents and essential expertise in Red/ET recombineering; M.S, A.A.H. and A.F.S. conceived the project and prepared the manuscript.
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Y.Z. and A.F.S. are shareholders, and Y.Z. is an employee of Gene Bridges GmbH, which holds the exclusive commercial rights to the Red/ET recombineering methodologies.
Supplementary information
Supplementary Fig. 1
BAC mapping. (PDF 53 kb)
Supplementary Fig. 2
Controlled expression of recombinases from pRedFlp. (PDF 65 kb)
Supplementary Fig. 3
Restriction digest analysis of the 10 tagged transgenes. (PDF 293 kb)
Supplementary Fig. 4
Recombineering outcome with individual clones. (PDF 167 kb)
Supplementary Table 1
Bombardment experiments. (PDF 15 kb)
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Sarov, M., Schneider, S., Pozniakovski, A. et al. A recombineering pipeline for functional genomics applied to Caenorhabditis elegans. Nat Methods 3, 839–844 (2006). https://doi.org/10.1038/nmeth933
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DOI: https://doi.org/10.1038/nmeth933
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