1887

Abstract

Repeated baculovirus infections in cultured insect cells lead to the generation of defective interfering viruses (DIs), which accumulate at the expense of the intact helper virus and compromise heterologous protein expression. In particular, multicapsid nucleopolyhedovirus (AcMNPV) DIs are enriched in an origin of viral DNA replication () not associated with the homologous regions (s). This non- is located within the coding sequence of the non-essential gene. We investigated the effect of a deletion of the AcMNPV non- on the heterologous protein expression levels following serial passage in Sf21 insect cells. Using homologous ET recombination in , deletions within the gene were made in a bacterial artificial chromosome (BAC) containing the entire AcMNPV genome (bacmid). All bacmids were equipped with an expression cassette containing the green fluorescent protein gene and a gene encoding the classical swine fever virus E2 glycoprotein (CSFV-E2). For the parental (intact) bacmid only, a strong accumulation of DIs with reiterated non-s was observed. This was not observed for the mutants, indicating that removal of the non- enhanced the genetic stability of the viral genome upon passaging. However, for all passaged viruses it was found that the entire BAC vector including the expression cassette was spontaneously deleted from the viral genome, leading to a rapid decrease in GFP and CSFV-E2 production. The rationale for the (intrinsic) genetic instability of the BAC vector in insect cells and the implications with respect to large-scale production of proteins with bacmid-derived baculoviruses are discussed.

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2003-10-01
2024-04-19
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