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Journal of Virology, April 2004, p. 4370-4375, Vol. 78, No. 8
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.8.4370-4375.2004

Genomically Intact Endogenous Feline Leukemia Viruses of Recent Origin

Alfred L. Roca,1 Jill Pecon-Slattery,2 and Stephen J. O'Brien2*

Laboratory of Genomic Diversity, Basic Research Program, SAIC-Frederick,1 National Cancer Institute, Frederick, Maryland 217022

Received 6 September 2003/ Accepted 20 December 2003

We isolated and sequenced two complete endogenous feline leukemia viruses (enFeLVs), designated enFeLV-AGTT and enFeLV-GGAG. In enFeLV-AGTT, the open reading frames are reminiscent of a functioning FeLV genome, and the 5' and 3' long terminal repeat sequences are identical. Neither endogenous provirus is genetically fixed in cats but polymorphic, with 8.9 and 15.2% prevalence for enFeLV-AGTT and enFeLV-GGAG, respectively, among a survey of domestic cats. Neither provirus was found in the genomes of related species of the Felis genus, previously shown to harbor enFeLVs. The absence of mutational divergence, polymorphic incidence in cats, and absence in related species suggest that these enFeLVs may have entered the germ line more recently than previously believed, perhaps coincident with domestication, and reopens the question of whether some enFeLVs might be replication competent.

* Corresponding author. Mailing address: Laboratory of Genomic Diversity, National Cancer Institute, Frederick, MD 21702-1201. Phone: (301) 846-1296. Fax: (301) 846-1686. E-mail: obrien{at}ncifcrf.gov.

Journal of Virology, April 2004, p. 4370-4375, Vol. 78, No. 8
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.8.4370-4375.2004




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