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Journal of Virology, May 1999, p. 3733-3736, Vol. 73, No. 5
0022-538X/99/$04.00+0

Receptor-Mediated Interference Mechanism Responsible for Resistance to Polytropic Leukemia Viruses in Mus castaneus

Myung Soo Lyu,dagger Abdallah Nihrane,Dagger and Christine A. Kozak*

Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland 20982-0460

Received 4 December 1998/Accepted 3 February 1999

The Asian mouse Mus castaneus is resistant to infection by the polytropic mink cell focus-inducing (MCF) subgroup of murine leukemia viruses (MuLVs). Genetic crosses showed this recessive resistance to be governed by a single gene that maps at or near the gene encoding the polytropic viral receptor, Rmc1. To investigate this resistance, we mated M. castaneus with mice carrying the wild mouse Sxv variant of the Rmc1 receptor that allows infection by xenotropic as well as polytropic virus. Unlike other F1 hybrids of M. castaneus, these F1 mice were resistant to both xenotropic and polytropic classes of MuLVs. Analysis of backcrossed progeny of the F1 hybrids mated to Sxv mice indicates that resistance is due to inheritance of two M. castaneus genes. Cells from individual backcross mice were also examined for cell surface antigen by fluorescence-activated cell sorter analysis with monoclonal antibodies reactive with xenotropic or MCF virus env glycoproteins. A correlation was observed between virus resistance and antigen, suggesting that virus resistance is due to expression of endogenous viral envelope genes that interfere with infection by exogenous virus. Since the inbred strain Rmc1 receptor remains functional in the presence of these M. castaneus genes, and since M. castaneus contains multiple copies of xenotropic MuLV env genes, we suggest that these resistance genes control expression of xenotropic env glycoprotein that interferes with exogenous virus in cells containing the Sxv variant of Rmc1.

* Corresponding author. Mailing address: Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, Bldg. 4, Room 329, 4 Center Dr. MSC 0460, Bethesda, MD 20982-0460. Phone: (301) 496-0972. Fax: (301) 480-2808. E-mail: ckozak{at}nih.gov.

dagger Present address: Laboratory of Population Genetics, National Cancer Institute, Bethesda, MD 20892.

Dagger Present address: Centre de Recherche CREMOC, Faculte Jean Monnet, Universite Paris Sud, Sceaux, France.

Journal of Virology, May 1999, p. 3733-3736, Vol. 73, No. 5
0022-538X/99/$04.00+0


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