Comparison of the growth kinetics of neuropathogenic and nonneuropathogenic equid herpesvirus type 1 (EHV-1) strains in cultured murine neuronal cells and the relevance of the D/N(752) coding change in DNA polymerase gene (ORF30).


We compared the growth kinetics of neuropathogenic and nonneuropathogenic equine herpesvirus type 1 (EHV-1) strains in mouse cerebral cortex cells and investigated the relevance of the D/N amino acid change at position 752 of ORF30 in Japanese isolates. Neuropathogenic electropherotype P strains 01c1 and 89c25 exhibited similar growth kinetics to nonneuropathogenic P strain 90c16 in cultured neurons; however, the growth ability of type B strain 97c7 was lower than those of the other strains tested. The amino acid encoded at 752 of ORF30 in 01c1 was asparagic acid; asparagine was encoded in the other EHV-1 strains isolated from Japanese horses. The D/N(752) difference in ORF30 may not be related to replication ability in neurons.




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