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J. Virol., 05 1997, 3684-3692, Vol 71, No. 5
Copyright © 1997, American Society for Microbiology

The simian T-lymphotropic/leukemia virus from Pan paniscus belongs to the type 2 family and infects Asian macaques

L Digilio, A Giri, N Cho, J Slattery, P Markham and G Franchini
Laboratory of Basic Research, National Cancer Institute, Bethesda, Maryland 20892-4255, USA.

The proviral DNA of the simian T-leukemia/lymphotropic virus (STLV) isolate, originally obtained from a captive colony of pygmy chimpanzees (Pan paniscus) (STLV(pan-p)), was cloned from the DNA of the chronically infected human T-cell line L93-79B. The entire proviral DNA sequence was obtained and compared with sequences of the known genotypes of STLV and human T-leukemia/lymphotropic virus types 1 and 2 (HTLV-1 and -2). Phylogenetic analysis indicates that STLV-2(pan-p) is an early divergence within the type 2 lineage and should be referred to as STLV-2(pan-p). Since STLV-2(pan-p) has been found in African nonhuman primates, we investigated its infectiousness and pathogenicity in Asian monkeys. Pigtailed macaques were inoculated with human cells harboring STLV(pan-p), and infection was assessed by virus isolation, PCR analysis of peripheral blood mononuclear cells, and seroconversion against viral antigens in HTLV-1/HTLV-2 and Western blot assay. Pigtailed macaques became persistently infected by STLV-2(pan-p), and the virus could be transferred by blood transfusion from an infected pigtailed macaque to a rhesus macaque. In addition, like HTLV-1 and HTLV-2, STLV-2(pan-p) was infectious in rabbits. In summary, STLV-2(pan- p) is a novel retrovirus distantly related to HTLV-2 and displays a host range similar to that demonstrated for other HTLV and STLV strains.

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