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Although methods for reverse genetics of herpesviruses have been established in early 1980s, the steps are laborious and time-consuming. In 1997, Dr. Koszinwski's group reported a novel approach for the construction of herpesvirus mutants, based on cloning the viral genome as a bacterial artificial chromosome (BAC) in E. coli. This technique allows the maintenance of viral genomes as plasmid in E. coli and the reconstitution of viral progeny by transfection of the BAC plasmid into eukaryotic cells. Any genetics modification of the viral genome in E. coli using bacterial genetics is possible, thereby facilitating the introduction of mutagenesis into herpesvirus genome. This 'BAC system' has opened new avenues for reverse and forward genetics of herpesviruses in basic research and in vector development for human therapy. Here we describe the principle of the 'BAC system' in herpesvirus researches.

BAC system: A novel method for manipulation of herpesvirus genomes based on the bacterial genetics.