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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Genomic organization and expression of simian foamy virus type 3 (SFV-3).

The complete nucleotide sequence of simian foamy virus type 3 (SFV-3) strain LK-3, isolated from an African green monkey, was determined. In addition to translation frames representing the gag, pol, and env genes, two open reading frames are located in the region between the env gene and the 3' long terminal repeat (LTR). Both SFV-3 and SFV-1 encode two open reading frames between env and the 3' LTR, whereas HFV encodes three open reading frames in this region. Northern blot analysis of cell cultures infected with SFV-3 revealed subgenomic RNAs for these open reading frames. The protease of SFV-3 is encoded by the pol gene in contrast to HFV which encodes the protease in the gag gene. Notably, the pol gene of SFV-3 in the +1 translational frame relative to the gag gene; this observation is in agreement with SFV-1, but differs for HFV and all other retrovirus genomes reported. Thus, gag-pol precursors of the SFVs appear to be expressed by a +1 frameshift. Nucleotide and deduced amino acid alignments of SFV-3, SFV-1, and HFV revealed an unexpected homology pattern; highest homologies are observed in the pol and env genes but low homologies are noted in the gag genes and the additional open reading frames. Analysis of phylogenetic trees confirms the classification of foamy viruses as a subfamily of retroviruses, distinct from the lentiviruses and oncoviruses.[1]


  1. Genomic organization and expression of simian foamy virus type 3 (SFV-3). Renne, R., Friedl, E., Schweizer, M., Fleps, U., Turek, R., Neumann-Haefelin, D. Virology (1992) [Pubmed]
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