Abstract
The Escherichia coli and vaccinia virus-based reverse genetics systems have been widely applied for the manipulation and engineering of coronavirus genomes. These systems, however, present several limitations and are sometimes difficult to establish in a timely manner for (re-)emerging viruses. In this chapter, we present a new universal reverse genetics platform for the assembly and engineering of infectious full-length cDNAs using yeast-based transformation-associated recombination cloning. This novel assembly method not only results in stable coronavirus infectious full-length cDNAs cloned in the yeast Saccharomyces cerevisiae but also fosters and accelerates the manipulation of their genomes. Such a platform is widely applicable for the scientific community, as it requires no specific equipment and can be performed in a standard laboratory setting. The protocol described can be easily adapted to virtually all known or emerging coronaviruses, such as Middle East respiratory syndrome coronavirus (MERS-CoV).
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