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- W2099001934 abstract "Most Trichomonas vaginalis isolates are carriers of the multisegmented double-stranded RNA (dsRNA) virus. In vitro polymerase assays were performed to demonstrate the RNA-dependent RNA polymerase (RDRP) activity of purified particles. Transcripts which comigrated with the dsRNAs of the virus were readily detected as synthesized products, indicating viral RDRP activity. In addition, smaller-sized dsRNA species, possibly two of approximately 700 bp (s1) and one of 500 bp (s2), were synthesized by purified virus particles of the CsCl gradient surrounding the virus peak. No cross-hybridization with either s1 or s2 and the dsRNA segments occurred, suggesting that s1 and s2 were synthesized from different templates. An RNase A protection assay revealed that the synthesized s1 and s2 polymerase products were double stranded. Furthermore, hybridization of products with strand-specific RNA of s1 generated from cDNA indicated that only one strand was synthesized in vitro. s1 and s2 were not visualized in ethidium bromide-stained agarose gels of dsRNA of infected trichomonads grown in batch cultures. However, dsRNA profiles of the same infected organisms cultivated under defined continuous-flow conditions contained readily detectable levels of s1 and s2, indicating that amplification of s1 and s2 occurred under specific environmental conditions. These newly discovered dsRNAs were not detected in all of the virus-carrying isolates. Finally, it is noteworthy that the s1 and s2 dsRNAs and the RDRP activity were not detected in trichomonal isolates without virus or in virus-negative progeny derived from virus-positive parental isolates. These data indicate the possibility of variations in the number of dsRNAs and/or of the presence of satellites in trichomonads infected with the multisegmented virus." @default.
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- W2099001934 date "1994-11-01" @default.
- W2099001934 modified "2023-10-16" @default.
- W2099001934 title "Unique double-stranded RNAs associated with the Trichomonas vaginalis virus are synthesized by viral RNA-dependent RNA polymerase" @default.
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- W2099001934 doi "https://doi.org/10.1128/jvi.68.11.7108-7114.1994" @default.
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