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

Receptors for polytropic and xenotropic mouse leukaemia viruses encoded by a single gene at Rmc1.

The onset of leukaemia caused by type C retroviruses (MLV) in mice is accelerated by the emergence of recombinant polytropic or mink cell focus-forming (MCF) viruses. Susceptibility to infection by polytropic/MCF and also by closely related xenotropic MLV has been mapped to Rmc1 on mouse chromosome 1 (refs 5-7). To identify this gene, we introduced an expression cDNA library prepared from mouse NIH3T3 fibroblasts into nonpermissive hamster cells and screened these cells for acquired susceptibility to MCF viruses encoding beta-galactosidase and G418 resistance. From hamster cell clones identified in the screen, we recovered a mouse cDNA that maps to Rmc1 and confers MCF MLV infection when expressed in nonpermissive cell lines. It encodes a membrane protein related to Syg1p (suppressor of yeast G alpha deletion; ref. 8). The receptor-binding domain of the MCF MLV envelope protein binds specifically to Xenopus laevis oocytes that express mouse Syg1, suggesting it functions as a receptor that mediates virus entry. We also obtained the cDNA encoding human SYG1. When expressed in hamster cells, it establishes infectivity by MCF MLV as well as xenotropic MLV, which do not infect laboratory mice.[1]


  1. Receptors for polytropic and xenotropic mouse leukaemia viruses encoded by a single gene at Rmc1. Yang, Y.L., Guo, L., Xu, S., Holland, C.A., Kitamura, T., Hunter, K., Cunningham, J.M. Nat. Genet. (1999) [Pubmed]
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