Equine arteritis virus (EAV) is a nonarthropod-borne togavirus. Six virus-specific RNA species have been found in EAV-infected cells having the following molecular weights: 4.3 X 10(6) (RNA1), 1.3 X 10(6) (RNA2), 0.9 X 10(6) (RNA3), 0.7 X 10(6) (RNA4), 0.3 X 10(6) (RNA5), and 0.2 X 10(6) (RNA6). RNA1 comigrates with the viral genome (M. F. Van Berlo, M. C. Horzinek, and B. A. M. Van der Zeijst, 1982, Virology 118, 345-352). All RNAs hybridized with a radio-labeled cDNA probe representing RNA6, indicating that they contain common sequences. To study this homology in more detail, RNase T1 oligonucleotide fingerprinting of the RNAs was undertaken. This confirmed the presence of common sequences and showed more specifically that the intracellular viral RNAs form a nested set. The number of oligonucleotides in RNA1, however, is only one-third of the expected value. In all aspects studied the replication mechanism of EAV differs from that of other known positive-stranded RNA viruses.
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