The sequence of the genome of the RA27/3 vaccine strain of rubella virus (RUB) was determined. In the process, several discrepancies between the previously reported genomic sequences of two wild RUB strains (Therien and M33) were resolved. The genomes of all three strains contain 9 762 nucleotides (nts), exclusive of the poly A tract. In all three strains, the genome contains ( ), a 40 nt untranslated region (UTR), an open reading frame (ORF) of 6 348 nts that encodes nonstructural proteins, a 123 nt UTR between the two genomic ORFs, a 3 189 nt ORF that encodes the structural proteins, and a 62 nt UTR. The end of the subgenomic RNA was found to correspond to a uridine residue at nt 6 436 of the genomic RNA. At the nucleotide level, the sequence of the three strains varied by 1.0 to 2.8%, while at the amino acid level, the sequence varied by 1.1 to 2.4% over both ORFs. The RA27/3 sequence will be of use in identification of the determinants of its attenuation, in vaccine production control and in development of second generation RUB vaccines based on recombinant DNA technology.
Archives of Virology – Springer Journals
Published: Jun 1, 1997
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