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Counter-selection recombineering of the baculovirus genome: a strategy for seamless modification of repeat-containing BACs

Lookup NU author(s): Professor Derek Mann


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Recombineering is employed to modify large DNA clones such as fosmids, BACs and PACs. Subtle and seamless modifications can be achieved using counter-selection strategies in which a donor cassette carrying both positive and negative markers inserted in the target clone is replaced by the desired sequence change. We are applying counter-selection recombineering to modify bacmid bMON14272, a recombinant baculoviral genome, as we wish to engineer the virus into a therapeutically useful gene delivery vector with cell targeting characteristics. Initial attempts to replace gp64 with Fusion (F) genes from other baculoviruses resulted in many rearranged clones in which the counter-selection cassette had been deleted. Bacmid bMON14272 contains nine highly homologous regions (hrs) and deletions were mapped to recombination between hr pairs. Recombineering modifications were attempted to decrease intramolecular recombination and/or increase recombineering efficiency. Of these only the use of longer homology arms on the donor molecule proved effective permitting seamless modification. bMON14272, because of the presence of the hr sequences, can be considered equivalent to a highly repetitive BAC and, as such, the optimized method detailed here should prove useful to others applying counter-selection recombineering to modify BACs or PACs containing similar regions of significant repeating homologies.

Publication metadata

Author(s): Westenberg M, Soedling HM, Mann DA, Nicholson LJ, Dolphin CT

Publication type: Article

Publication status: Published

Journal: Nucleic Acids Research

Year: 2010

Volume: 38

Issue: 16

Print publication date: 09/07/2010

ISSN (print): 0305-1048

ISSN (electronic): 1362-4962

Publisher: Oxford University Press


DOI: 10.1093/nar/gkq596


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Funder referenceFunder name
King's College London-Wellcome
WT078981Wellcome Trust