A nested set of six or seven subgenomic mRNAs is formed in cells infected with different isolates of porcine reproductive and respiratory syndrome virus
- 1 June 1996
- journal article
- research article
- Published by Microbiology Society in Journal of General Virology
- Vol. 77 (6) , 1265-1270
- https://doi.org/10.1099/0022-1317-77-6-1265
Abstract
The subgenomic mRNAs (sg mRNA) of porcine reproductive and respiratory syndrome virus (PRRSV) were characterized. The number of sg mRNAs, which form a 3′-coterminal nested set in PRRSV-infected cells, varied from six to seven among PRRSV isolates with differing virulence. The additional species of sg mRNA in some isolates of PRRSV was designated as sg mRNA 3-1. The leader-mRNA junction sequences of sg mRNAs 3, 3-1 and 4 were found to contain a similar six nucleotide sequence motif, U(G)UA(G/C)ACC. By comparing the 5′-terminal sequence of sg mRNA 3-1 with the genomic sequence of two isolates, ISU79 and ISU1894, it was found that a point mutation, from U in isolate ISU1894 to C in isolate ISU79, led to the acquisition of a new leader-mRNA junction sequence (UUGACC) in isolate ISU79, and therefore an additional species of sg mRNA 3-1. A small ORF (3-1) was identified at the 5′ end of sg mRNA 3-1.Keywords
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