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. 1992 Oct;66(10):6181–6185. doi: 10.1128/jvi.66.10.6181-6185.1992

Identification of a feline immunodeficiency virus gene which is essential for cell-free virus infectivity.

K Tomonaga 1, J Norimine 1, Y S Shin 1, M Fukasawa 1, T Miyazawa 1, A Adachi 1, T Toyosaki 1, Y Kawaguchi 1, C Kai 1, T Mikami 1
PMCID: PMC283668  PMID: 1382146

Abstract

Feline immunodeficiency virus (FIV) contains at least three small open reading frames (ORFs) in the genome, in addition to the three structural genes. Two of these ORFs (putative vif and ORF-A) have unknown functions. Northern (RNA) blot analysis of mRNAs from an FIV-infected cell line showed that the putative-vif-specific mRNA was expressed as a 5.2-kb species. To examine the function of the putative vif gene, we constructed mutants carrying a deletion in either the vif-like gene or the rev gene from an infectious molecular clone of FIV. Although the vif mutant produced virion-associated reverse transcriptase at a normal level upon transfection, cell-free virus prepared from the transfected cells could not infect feline CD4+ cells. The infectivity of the vif mutant, however, was demonstrated in a coculture of the transfected cells and feline CD4+ cells. We conclude that FIV contains the vif gene, which is structurally and functionally similar to that of the primate lentiviruses.

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Selected References

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