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. 1991 Jul;65(7):3932–3937. doi: 10.1128/jvi.65.7.3932-3937.1991

Analysis of the transcription pattern and mapping of the putative rev and env splice junctions of bovine immunodeficiency-like virus.

M S Oberste 1, J D Greenwood 1, M A Gonda 1
PMCID: PMC241432  PMID: 1645801

Abstract

The bovine immunodeficiency-like virus (BIV) genome contains the obligatory structural genes of all retroviruses and, in addition, the complex central region of lentiviruses; this novel region may code for at least five nonstructural/regulatory genes in BIV (K.J.Garvey, M.S. Oberste, J.E. Elser, M.J. Braun, and M.A. Gonda, Virology 175:391-409, 1990). As a prelude to determining the function of these novel open reading frames, the transcriptional pattern of BIV was studied by Northern analysis of RNA from BIV-infected cells. Five size classes of BIV-specific RNAs of 8.5, 4.1, 3.8, 1.7, and 1.4 kb were detected. The 8.5-kb RNA contains sequences from all regions of the genome; it is the virion RNA and probably serves as the gag-pol transcript as well. By using gene-specific probes, subgenomic viral RNAs of 3.8, 1.7, and 1.4 kb were tentatively identified as the env, tat, and rev spliced messages, respectively. The 4.1-kb RNA could not be unambiguously identified but may encode vif. The hybridization patterns of the putative tat and rev mRNAs suggest that they are the products of multiple splicing events. Discrete transcripts for the BIV W and Y central region open reading frames were not defined. The characterization of partial cDNA clones has permitted the mapping of the env and putative rev splice junctions.

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Selected References

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