Abstract
The propagation of pseudorabies virus (PrV) mutants deficient in essential glycoproteins gp50 and gII was studied after inoculation of transcomplemented gp50- and gII- PrV into the motor hypoglossal (XII) nerves of mice. In this model, viral spread from the infected XII motoneurons involves specific transneuronal transfer to connected cells and local, nonspecific transfer. For comparison, a PrV mutant lacking the nonessential nonstructural glycoprotein gX was included. Although the efficiencies of first-cycle replication were similar for the three viruses, only gX- and gp50- progeny mutants could spread from XII motoneurons via transneuronal and local transfer. The extents of transfer of gX- and gp50- PrV were comparable. The results show that the absence of gp50 does not alter the pattern of transneuronal or local spread of PrV, whereas gII is essential for both processes.
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