Common and distinct regions of defective-interfering RNAs of Sindbis virus - PubMed (original) (raw)
Common and distinct regions of defective-interfering RNAs of Sindbis virus
S S Monroe et al. J Virol. 1984 Mar.
Abstract
Defective-interfering (DI) particles are helper-dependent deletion mutants which interfere specifically with the replication of the homologous standard virus. Serial passaging of alphaviruses in cultured cells leads to the accumulation of DI particles whose genomic RNAs are heterogeneous in size and sequence composition. In an effort to examine the sequence organization of an individual DI RNA species generated from Sindbis virus, we isolated and sequenced a representative cDNA clone derived from a Sindbis DI RNA population. Our data showed that: (i) the 3' end of the DI RNA template was identical to the 50 nucleotides at the 3' end of the standard RNA; (ii) the majority (75%) of the DI RNA template was derived from the 1,200 5'-terminal nucleotides of the standard RNA and included repeats of these sequences; and (iii) the 5' end of the DI RNA template was not derived from the standard RNA, but is nearly identical to a cellular tRNAAsp (S. S. Monroe and S. Schlesinger, Proc. Natl. Acad. Sci. U.S.A. 80:3279-3283, 1983). We have also utilized restriction fragments from cloned DNAs to probe by blot hybridization for the presence of conserved sequences in several independently derived DI RNA populations. These studies indicated that: (i) a 51-nucleotide conserved sequence located close to the 5' end of several alphavirus RNAs was most likely retained in the DI RNAs; (ii) the junction region containing the 5' end of the subgenomic 26S mRNA was deleted from the DI RNAs; and (iii) the presence of tRNAAsp sequences was a common occurrence in Sindbis virus DI RNAs derived by passaging in chicken embryo fibroblasts.
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